commit 2802401eee5747390b3db136f65935bcf4deadd8
Author: Andrew <mrcluster@ya.ru>
Date:   Mon Nov 18 10:01:42 2019 +0700

    initial

diff --git a/1sem/adaptation courses/1/1.cpp b/1sem/adaptation courses/1/1.cpp
new file mode 100644
index 0000000..d45a530
--- /dev/null
+++ b/1sem/adaptation courses/1/1.cpp	
@@ -0,0 +1,15 @@
+// ac_1_1.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cstdio>
+#include <clocale>
+#include <string>
+using namespace std;
+
+int main()
+{
+    setlocale(LC_ALL, "russian");
+    string n, d;
+    cin >> n >> d;
+    cout << "Привет, " << d << " " << n << "!";
+}
diff --git a/1sem/adaptation courses/1/2.cpp b/1sem/adaptation courses/1/2.cpp
new file mode 100644
index 0000000..0c160f0
--- /dev/null
+++ b/1sem/adaptation courses/1/2.cpp	
@@ -0,0 +1,15 @@
+// ac_1_2.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cstdio>
+#include <clocale>
+#include <cmath>
+using namespace std;
+
+int main()
+{
+    setlocale(LC_ALL, "russian");
+    double a;
+    cin >> a;
+    cout << a*a*a*sqrt(2.f)/12;
+}
diff --git a/1sem/adaptation courses/1/3.cpp b/1sem/adaptation courses/1/3.cpp
new file mode 100644
index 0000000..f88b30e
--- /dev/null
+++ b/1sem/adaptation courses/1/3.cpp	
@@ -0,0 +1,15 @@
+// ac_1_3.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cstdio>
+#include <clocale>
+#include <cmath>
+using namespace std;
+
+int main()
+{
+    setlocale(LC_ALL, "russian");
+    double a;
+    cin >> a;
+    cout << 2*a/9.81;
+}
diff --git a/1sem/adaptation courses/1/4.cpp b/1sem/adaptation courses/1/4.cpp
new file mode 100644
index 0000000..eeacd22
--- /dev/null
+++ b/1sem/adaptation courses/1/4.cpp	
@@ -0,0 +1,19 @@
+// ac_1_4.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cstdio>
+#include <clocale>
+#include <cmath>
+using namespace std;
+
+int main()
+{
+    setlocale(LC_ALL, "russian");
+    int d,h,m;
+    cin >> m;
+    d = m / (60 * 24);
+    m = m - (d * 60 * 24);
+    h = m / 60;
+    m = m - (h * 60);
+    printf("%d сутки(ок), %d часа(ов), %d минут(а)", d, h, m);
+}
diff --git a/1sem/adaptation courses/10/30.cpp b/1sem/adaptation courses/10/30.cpp
new file mode 100644
index 0000000..1be5f8b
--- /dev/null
+++ b/1sem/adaptation courses/10/30.cpp	
@@ -0,0 +1,36 @@
+// ac_10_30.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cstring>
+#define MAX_STRING 5000
+
+using namespace std;
+
+bool is_palindrome(const char *s) {
+    bool flag = true;
+    size_t i = 0;
+    while (flag && i < strlen(s)/2) {
+        char cc = *(s + i);
+        char lc = *(s + strlen(s)-i-1);
+        flag = (cc == lc);
+        i++;
+    }
+    return flag;
+}
+
+void read_string(istream &reader, char *where, char delimiter) {
+    char c;
+    size_t i = 0;
+    while ((c = reader.get()) != delimiter && reader.good()) {
+        *(where + i++) = c;
+    }
+    *(where + i) = '\0';
+}
+
+int main() {
+    char *s = new char[MAX_STRING];
+    cout << "Input >>>";
+    read_string(cin, s, '\n');
+    cout << "String is" << (is_palindrome(s)? "" : "n't") << " palindrome" << endl;
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/10/31.cpp b/1sem/adaptation courses/10/31.cpp
new file mode 100644
index 0000000..6df20d0
--- /dev/null
+++ b/1sem/adaptation courses/10/31.cpp	
@@ -0,0 +1,36 @@
+// ac_10_31.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cstring>
+#define MAX_STRING 5000
+
+using namespace std;
+
+void del_first_last(char *s) {
+    if (strlen(s) < 2) {
+        *s = '\0';
+    }
+    else {
+        strncpy(s, s + 1, strlen(s) - 2);
+        *(s + strlen(s) - 2) = '\0';
+    }
+}
+
+void read_string(istream &reader, char *where, char delimiter) {
+    char c;
+    size_t i = 0;
+    while ((c = reader.get()) != delimiter && reader.good()) {
+        *(where + i++) = c;
+    }
+    *(where + i) = '\0';
+}
+
+int main() {
+    char *s = new char[MAX_STRING];
+    cout << "Input >>>";
+    read_string(cin, s, '\n');
+    cout << "Before: " << s << endl;
+    del_first_last(s);
+    cout << "After: " << s << endl;
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/10/32.cpp b/1sem/adaptation courses/10/32.cpp
new file mode 100644
index 0000000..2efeb7a
--- /dev/null
+++ b/1sem/adaptation courses/10/32.cpp	
@@ -0,0 +1,35 @@
+// ac_10_32.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cstring>
+#define MAX_STRING 5000
+
+using namespace std;
+
+void capitalize(char *s) {
+    *s = (char)toupper(*s);
+    for (size_t i = 1; i < strlen(s); i++) {
+        if (*(s + i) == ' ') {
+            *(s + i + 1) = (char)toupper(*(s + i + 1));
+        }
+    }
+}
+
+void read_string(istream &reader, char *where, char delimiter) {
+    char c;
+    size_t i = 0;
+    while ((c = reader.get()) != delimiter && reader.good()) {
+        *(where + i++) = c;
+    }
+    *(where + i) = '\0';
+}
+
+int main() {
+    char *s = new char[MAX_STRING];
+    cout << "Input >>>";
+    read_string(cin, s, '\n');
+    cout << "Before: " << s << endl;
+    capitalize(s);
+    cout << "After: " << s << endl;
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/11/33.cpp b/1sem/adaptation courses/11/33.cpp
new file mode 100644
index 0000000..744cc5a
--- /dev/null
+++ b/1sem/adaptation courses/11/33.cpp	
@@ -0,0 +1,34 @@
+// ac_11_33.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <vector>
+
+using namespace std;
+
+void read_string(istream &reader, string &where, char delimiter) {
+    char c;
+    while ((c = reader.get()) != delimiter && reader.good()) {
+        where += c;
+    }
+}
+
+int main() {
+    vector<string> strs;
+    ifstream inf("in.txt");
+    if (!inf.is_open())
+    {
+        cerr << "Unable to open file" << endl;
+        return 1;
+    }
+    while (!inf.eof()) {
+        string s;
+        read_string(inf, s, '\n');
+        strs.push_back(s);
+    }
+    for (auto it = strs.end(); it-- != strs.begin();) {
+        cout << *it << endl;
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/11/34.cpp b/1sem/adaptation courses/11/34.cpp
new file mode 100644
index 0000000..4f5c49c
--- /dev/null
+++ b/1sem/adaptation courses/11/34.cpp	
@@ -0,0 +1,52 @@
+// ac_11_34.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+
+int count_words(const string &str) {
+    bool inSpaces = true;
+    int numWords = 0;
+    auto it = begin(str);
+    while (*it != '\0')
+    {
+        if (isspace(*it))
+        {
+            inSpaces = true;
+        }
+        else if (inSpaces)
+        {
+            numWords++;
+            inSpaces = false;
+        }
+
+        ++it;
+    }
+    return numWords;
+}
+
+void read_string(istream &reader, string &where, char delimiter) {
+    char c;
+    while ((c = reader.get()) != delimiter && reader.good()) {
+        where += c;
+    }
+}
+
+int main() {
+    ifstream inf("in.txt");
+    if (!inf.is_open())
+    {
+        cerr << "Unable to open file" << endl;
+        return 1;
+    }
+    while (!inf.eof()) {
+        string s;
+        read_string(inf, s, '\n');
+        cout << count_words(s) << " words: " << s << endl;
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/11/35.cpp b/1sem/adaptation courses/11/35.cpp
new file mode 100644
index 0000000..96cfc74
--- /dev/null
+++ b/1sem/adaptation courses/11/35.cpp	
@@ -0,0 +1,37 @@
+// ac_11_35.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <fstream>
+#include <string>
+#define MAX_STRING 5000
+
+using namespace std;
+
+string get_short_name(const string &full_name) {
+    char s[MAX_STRING], n[MAX_STRING], f[MAX_STRING], out[MAX_STRING];
+    sscanf(full_name.c_str(), "%s %s %s", s, n, f);
+    sprintf(out, "%s %c.%c.", s, n[0], f[0]);
+    return string(out);
+}
+
+void read_string(istream &reader, string &where, char delimiter) {
+    char c;
+    while ((c = reader.get()) != delimiter && reader.good()) {
+        where += c;
+    }
+}
+
+int main() {
+    ifstream inf("in.txt");
+    if (!inf.is_open())
+    {
+        cerr << "Unable to open file" << endl;
+        return 1;
+    }
+    while (!inf.eof()) {
+        string s;
+        read_string(inf, s, '\n');
+        cout << get_short_name(s) << endl;
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/2/5.cpp b/1sem/adaptation courses/2/5.cpp
new file mode 100644
index 0000000..65632ec
--- /dev/null
+++ b/1sem/adaptation courses/2/5.cpp	
@@ -0,0 +1,33 @@
+// ac_2_5.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+#include <cmath>
+#include <clocale>
+#include <afxres.h>
+using namespace std;
+
+int main() {
+    SetConsoleCP(CP_UTF8);
+    SetConsoleOutputCP(CP_UTF8);
+    setlocale(LC_ALL, "ru_RU.UTF-8");
+    int h, m;
+    scanf("%d %d", &h, &m);
+    h += m > 59;
+    if (h > 24) {
+        printf("Exception: hours > 24");
+        return 0;
+    }
+    printf("%02d:%02d\n", h, m);
+    if (h >= 6 && h < 12) {
+        printf("Доброе утро!");
+    }
+    else if (h >= 12 && h < 18) {
+        printf("Добрый день!");
+    }
+    else if (h >= 18 && h < 24) {
+        printf("Добрый вечер!");
+    }
+    else if (h >= 0 && h < 6){
+        printf("Доброй ночи!");
+    }
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/2/6.cpp b/1sem/adaptation courses/2/6.cpp
new file mode 100644
index 0000000..fe143f1
--- /dev/null
+++ b/1sem/adaptation courses/2/6.cpp	
@@ -0,0 +1,25 @@
+// ac_2_6.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+#include <cmath>
+#include <clocale>
+#include <afxres.h>
+using namespace std;
+
+int main() {
+    SetConsoleCP(CP_UTF8);
+    SetConsoleOutputCP(CP_UTF8);
+    setlocale(LC_ALL, "ru_RU.UTF-8");
+    int c;
+    scanf("%d", &c);
+    int ln = c % 10;
+    if ((ln == 0) || (ln >= 5 && ln <= 9) || (c % 100 == 11)) {
+        printf("В аудитории %d студентов", c);
+    }
+    else if (ln == 1) {
+        printf("В аудитории %d студент", c);
+    }
+    else if (ln > 1 && ln < 5) {
+        printf("В аудитории %d студента", c);
+    }
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/2/7.cpp b/1sem/adaptation courses/2/7.cpp
new file mode 100644
index 0000000..f5c697d
--- /dev/null
+++ b/1sem/adaptation courses/2/7.cpp	
@@ -0,0 +1,34 @@
+// ac_2_7.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+#include <cmath>
+#include <clocale>
+#include <afxres.h>
+using namespace std;
+
+int main() {
+    SetConsoleCP(CP_UTF8);
+    SetConsoleOutputCP(CP_UTF8);
+    setlocale(LC_ALL, "ru_RU.UTF-8");
+    double op1, op2;
+    char f;
+    printf("<first operand> <operator> <second operand> >>>");
+    scanf("%lf %s %lf", &op1, &f, &op2);
+    switch (f) {
+        case '+':
+            printf("%lf\n", op1 + op2);
+            break;
+        case '-':
+            printf("%lf\n", op1 - op2);
+            break;
+        case '*':
+            printf("%lf\n", op1 * op2);
+            break;
+        case '/':
+            printf("%lf\n", op1 / op2);
+            break;
+        default:
+            printf("Incorrect operator");
+            break;
+    }
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/3/10.cpp b/1sem/adaptation courses/3/10.cpp
new file mode 100644
index 0000000..d9fa522
--- /dev/null
+++ b/1sem/adaptation courses/3/10.cpp	
@@ -0,0 +1,25 @@
+// ac_3_10.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+bool in_D(double x, double y)
+{
+    double R = x*x + y*y;
+    bool up = (y >= 0);
+    bool l = (x <= 0);
+    bool r = (x >= 0);
+    bool fp = l and (R <= 1);
+    bool sp = r and (R >= 0.36) and (R <= 1);
+    return up and (fp or sp);
+}
+
+int main()
+{
+    double x, y;
+    cout << "x, y >>>";
+    cin >> x >> y;
+    double P = (in_D(x, y)? x+y : 0 );
+    cout << "P(x,y)= " << P << endl;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/3/11.cpp b/1sem/adaptation courses/3/11.cpp
new file mode 100644
index 0000000..abb1990
--- /dev/null
+++ b/1sem/adaptation courses/3/11.cpp	
@@ -0,0 +1,21 @@
+// ac_3_11.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+bool in_D(double x, double y)
+{
+    bool moreTwo = (y >= 2);
+    bool inAbs = (y >= 2*abs(x));
+    return moreTwo or inAbs;
+}
+
+int main()
+{
+    double x, y, a;
+    cout << "x, y, a >>>";
+    cin >> x >> y >> a;
+    double S = ((in_D(x, y) and (a < 2))? (pow(a, -x)) : log(1 + x*x));
+    cout << "S(x,y,a)= " << S << endl;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/3/9.cpp b/1sem/adaptation courses/3/9.cpp
new file mode 100644
index 0000000..523af7c
--- /dev/null
+++ b/1sem/adaptation courses/3/9.cpp	
@@ -0,0 +1,20 @@
+// ac_3_9.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <clocale>
+#include <cmath>
+using namespace std;
+
+bool in_D(double x, double y)
+{
+    return ((y >= abs(x)) && (x*x+y*y <= 1));
+}
+
+int main()
+{
+    double x, y;
+    cout << "x, y >>>";
+    cin >> x >> y;
+    double z = (in_D(x, y)? sin(x) : x + 2 * y );
+    cout << "z(x,y)= " << z << endl;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/4/12.cpp b/1sem/adaptation courses/4/12.cpp
new file mode 100644
index 0000000..a8f15de
--- /dev/null
+++ b/1sem/adaptation courses/4/12.cpp	
@@ -0,0 +1,25 @@
+// ac_4_12.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+double ak(double x, int k) {
+    return sqrt(x*x + pow(sin(k*M_PI_4), 2));
+}
+
+double sum(double x, int N) {
+    double out = 0;
+    for (int k = 1; k <= N; k++) {
+        out += ak(x, k);
+    }
+    return out;
+}
+
+int main() {
+    double x;
+    int N;
+    cout << "x, N >>>";
+    cin >> x >> N;
+    cout << "S= " << sum(x, N) << endl;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/4/13.cpp b/1sem/adaptation courses/4/13.cpp
new file mode 100644
index 0000000..f170932
--- /dev/null
+++ b/1sem/adaptation courses/4/13.cpp	
@@ -0,0 +1,30 @@
+// ac_4_13.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+double xmi(double x, int N) {
+    double out = 0;
+    for (int i = 1; i <= N; i++) {
+        out += 1/pow(x, i);
+    }
+    return out;
+}
+
+double xi(double x, int N) {
+    double out = 1;
+    for (int i = 0; i <= N; i++) {
+        out *= (x - i);
+    }
+    return out;
+}
+
+int main() {
+    double x;
+    int N;
+    cout << "x, N >>>";
+    cin >> x >> N;
+    cout << "S= " << xmi(x, N) << endl;
+    cout << "P= " << xi(x, N) << endl;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/4/14.cpp b/1sem/adaptation courses/4/14.cpp
new file mode 100644
index 0000000..cf47bd9
--- /dev/null
+++ b/1sem/adaptation courses/4/14.cpp	
@@ -0,0 +1,25 @@
+// ac_4_14.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+double inline ai(int i) {
+    return ((i%3 == 0)? (i / 3.) : (i / (i - 3.)));
+}
+
+double sai(int i) {
+    double out = 0;
+    for (int k = 1; k <= i; k++) {
+        auto fr = ai(k);
+        out += pow(fr, 2);
+    }
+    return out;
+}
+
+int main() {
+    int N;
+    cout << "N >>>";
+    cin >> N;
+    cout << "S= " << sai(N) << endl;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/5/15.cpp b/1sem/adaptation courses/5/15.cpp
new file mode 100644
index 0000000..4bbdb1b
--- /dev/null
+++ b/1sem/adaptation courses/5/15.cpp	
@@ -0,0 +1,22 @@
+// ac_5_15.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+double df(int N) {
+    double out = 1.;
+    double os = 0.;
+    for (int i = 1; i <= N; i++) {
+        os += i*i;
+        out *= os;
+    }
+    return out;
+}
+
+int main() {
+    int N;
+    cout << "N >>>";
+    cin >> N;
+    cout.setf(ios_base::fixed);
+    cout << "PS= " << df(N) << endl;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/5/16.cpp b/1sem/adaptation courses/5/16.cpp
new file mode 100644
index 0000000..255b1b3
--- /dev/null
+++ b/1sem/adaptation courses/5/16.cpp	
@@ -0,0 +1,32 @@
+// ac_5_16.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+int fk(int i) {
+    if ((i == 0) || (i == 1))
+        return 1;
+    int out = 1;
+    for (int j = 2; j <= i; j++) {
+        out *= j;
+    }
+    return out;
+}
+
+double df(int N, int M) {
+    double out = 0;
+    int fak = fk(M);
+    for (int k = M; k <= N; k++) {
+        out += k*k*log(fak);
+        fak *= k+1;
+    }
+    return out;
+}
+
+int main() {
+    int N, M;
+    cout << "N, M >>>";
+    cin >> N >> M;
+    cout << "S= " << df(N, M) << endl;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/5/17.cpp b/1sem/adaptation courses/5/17.cpp
new file mode 100644
index 0000000..4540b08
--- /dev/null
+++ b/1sem/adaptation courses/5/17.cpp	
@@ -0,0 +1,29 @@
+// ac_5_17.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+#include <set>
+using namespace std;
+
+double df(int N) {
+    double out = 0.;
+    double i_ = 1;
+    for (int i = 1; i <= N; i++) {
+        i_ *= i;
+        double j_ = 1.;
+        double out_ = 1.;
+        for (int j = 1; j <= i; j++) {
+            j_ *= j;
+            out_ *= j_/i_;
+        }
+        out += out_;
+    }
+    return out;
+}
+
+int main() {
+    int N;
+    cout << "N >>>";
+    cin >> N;
+    cout << "SP= " << df(N) << endl;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/6/18.cpp b/1sem/adaptation courses/6/18.cpp
new file mode 100644
index 0000000..4545b25
--- /dev/null
+++ b/1sem/adaptation courses/6/18.cpp	
@@ -0,0 +1,24 @@
+// ac_6_18.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+double inline funk(int i) {
+    return 1./i;
+}
+
+int main() {
+    double eps;
+    cout << "eps=";
+    cin >> eps;
+    int i = 1;
+    double cur = funk(i);
+    double prev = 1e6*1.;
+    while (abs(cur-prev)>=eps) {
+        prev = cur;
+        cur = funk(++i);
+    }
+    cout << "a(i=" << i << ")=" << cur;
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/6/19.cpp b/1sem/adaptation courses/6/19.cpp
new file mode 100644
index 0000000..1617ca1
--- /dev/null
+++ b/1sem/adaptation courses/6/19.cpp	
@@ -0,0 +1,23 @@
+// ac_6_19.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+double inline funk(int i) {
+    return 1./i;
+}
+
+int main() {
+    double A;
+    cout << "A=";
+    cin >> A;
+    int i = 1;
+    double cur = funk(i);
+    double prev = 1e6*1.;
+    while (!((prev > A) && (A >= cur))) {
+        prev = cur;
+        cur = funk(++i);
+    }
+    cout << "a(i=" << i << ")=" << cur;
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/6/20.cpp b/1sem/adaptation courses/6/20.cpp
new file mode 100644
index 0000000..452049e
--- /dev/null
+++ b/1sem/adaptation courses/6/20.cpp	
@@ -0,0 +1,28 @@
+// ac_6_20.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+double inline funk(int i) {
+    double out = 1;
+    for (int k = 1; k <= i; k++) {
+        out *= (1 - 1 / sqrt(k + i));
+    }
+    return out;
+}
+
+int main() {
+    double eps;
+    cout << "eps=";
+    cin >> eps;
+    int i = 0;
+    double aip = funk(++i);
+    double ai = funk(++i);
+    while (abs(ai-aip)>=eps) {
+        aip = ai;
+        ai = funk(++i);
+    }
+    cout << "a(i=" << i << ")=" << ai;
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/7/21.cpp b/1sem/adaptation courses/7/21.cpp
new file mode 100644
index 0000000..8c049aa
--- /dev/null
+++ b/1sem/adaptation courses/7/21.cpp	
@@ -0,0 +1,21 @@
+// ac_7_21.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+int main() {
+    int N;
+    cout << "N >>>";
+    cin >> N;
+    int *A = new int[N];
+    for (int i = 0; i < N; i++) {
+        cout << "A[" << i << "] >>>";
+        cin >> *(A + i);
+    }
+
+    cout << "A = ";
+    for (int i = 0; i < N; i++) {
+        cout << *(A + i) << " ";
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/7/22.cpp b/1sem/adaptation courses/7/22.cpp
new file mode 100644
index 0000000..cc09d41
--- /dev/null
+++ b/1sem/adaptation courses/7/22.cpp	
@@ -0,0 +1,30 @@
+// ac_7_22.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <ctime>
+using namespace std;
+
+int main() {
+    srand(time(nullptr) / 2);
+
+    int N;
+    cout << "N >>>";
+    cin >> N;
+    int *rez = new int[N];
+    int *data = new int[100]();
+    for (int i = 0; i < N; i++) {
+        *(rez + i) = 1 + rand() % 100 + 1;
+    }
+    for (int i = 0; i < N; i++) {
+        *(data + (*(rez + i) - 1)) += 1;
+    }
+    cout << "rez = ";
+    for (int i = 0; i < N; i++) {
+        cout << *(rez + i) << " ";
+    }
+    cout << endl << endl;
+    for (int i = 0; i < 100; i++) {
+         cout << "Count of `" << i + 1 << "`: " << *(data + i) << endl;
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/7/23.cpp b/1sem/adaptation courses/7/23.cpp
new file mode 100644
index 0000000..d6b20d1
--- /dev/null
+++ b/1sem/adaptation courses/7/23.cpp	
@@ -0,0 +1,54 @@
+// ac_7_23.cpp
+// Горбацевич Андрей
+#include <iostream>
+
+using namespace std;
+
+int *get_array(size_t size);
+void print_array(const int *arr, size_t size);
+size_t remove_zeros(int *arr, size_t n);
+
+int main()
+{
+    size_t len;
+    cout << "Input length >>>";
+    cin >> len;
+    cout << "Input array >>>";
+    int *arr = get_array(len);
+    size_t zc = remove_zeros(arr, len);
+    cout << "Zeros count: " << zc << endl;
+    cout << "Resulting array: ";
+    print_array(arr, len-zc);
+}
+
+int *get_array(size_t size) {
+    int *array = new int[size]();
+    for (size_t i = 0; i < size; i++) {
+        cin >> *(array + i);
+    }
+    return array;
+}
+
+void print_array(const int *arr, size_t size) {
+    for (size_t i = 0; i < size; i++) {
+        cout << *(arr + i) << " ";
+    }
+    cout << endl;
+}
+
+size_t remove_zeros(int *arr, size_t n) {
+    size_t out = 0;
+    bool flag;
+    do {
+        flag = false;
+        for (size_t i = 0; i < n-1; i++) {
+            if (*(arr + i) == 0 && *(arr + i + 1) != 0) {
+                swap(*(arr + i), *(arr + i + 1));
+                out++;
+                flag = true;
+                break;
+            }
+        }
+    } while (flag);
+    return out;
+}
diff --git a/1sem/adaptation courses/8/24.cpp b/1sem/adaptation courses/8/24.cpp
new file mode 100644
index 0000000..e7876f3
--- /dev/null
+++ b/1sem/adaptation courses/8/24.cpp	
@@ -0,0 +1,30 @@
+// ac_8_24.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <vector>
+#include <algorithm>
+using namespace std;
+
+vector<int> two_mins(const vector<int> &vec) {
+    vector<int> v = vec;
+    sort(begin(v), end(v));
+    v.resize(2);
+    return v;
+}
+
+int main() {
+    int N;
+    cout << "N >>>";
+    cin >> N;
+    vector<int> v;
+    v.reserve(N);
+    cout << "v[...] >>>";
+    for (int i = 0; i < N; i++) {
+        int j;
+        cin >> j;
+        v.push_back(j);
+    }
+    vector<int> nv = two_mins(v);
+    cout << "Two minimals is " << nv[0] << " and " << nv[1] << endl;
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/8/25.cpp b/1sem/adaptation courses/8/25.cpp
new file mode 100644
index 0000000..5f432d5
--- /dev/null
+++ b/1sem/adaptation courses/8/25.cpp	
@@ -0,0 +1,31 @@
+// ac_8_25.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <vector>
+#include <algorithm>
+using namespace std;
+
+vector<int> max_diff(const vector<int> &vec) {
+    vector<int> v = vec;
+    sort(begin(v), end(v));\
+    swap(*(v.end() - 1), v[1]);
+    v.resize(2);
+    return v;
+}
+
+int main() {
+    int N;
+    cout << "N >>>";
+    cin >> N;
+    vector<int> v;
+    v.reserve(N);
+    cout << "v[...] >>>";
+    for (int i = 0; i < N; i++) {
+        int j;
+        cin >> j;
+        v.push_back(j);
+    }
+    vector<int> nv = max_diff(v);
+    cout << "Biggest diff is between " << nv[0] << " and " << nv[1] << " (eq. " << nv[0] - nv[1] << ")" << endl;
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/8/26.cpp b/1sem/adaptation courses/8/26.cpp
new file mode 100644
index 0000000..1d3c97f
--- /dev/null
+++ b/1sem/adaptation courses/8/26.cpp	
@@ -0,0 +1,40 @@
+// ac_8_26.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <vector>
+using namespace std;
+
+vector<int> count_less(const vector<int> &vec, int h) {
+    vector<int> v;
+    v.reserve(vec.size());
+    for (size_t c = 0; c < vec.size(); c++) {
+        if (vec[c] < h) {
+            v.push_back(c);
+        }
+    }
+    return v;
+}
+
+int main() {
+    int N;
+    cout << "N >>>";
+    cin >> N;
+    vector<int> heights;
+    heights.reserve(N);
+    cout << "heights[...] >>>";
+    for (int i = 0; i < N; i++) {
+        int j;
+        cin >> j;
+        heights.push_back(j);
+    }
+    int h;
+    cout << "h >>>";
+    cin >> h;
+    vector<int> nv = count_less(heights, h);
+    cout << "Lesser indexes: ";
+    for (int ch : nv) {
+        cout << ch << " ";
+    }
+    cout << endl;
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/9/27.cpp b/1sem/adaptation courses/9/27.cpp
new file mode 100644
index 0000000..24af4a9
--- /dev/null
+++ b/1sem/adaptation courses/9/27.cpp	
@@ -0,0 +1,43 @@
+// ac_9_27.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <fstream>
+#include <vector>
+
+using namespace std;
+
+inline int sign(int i) {
+    return (i < 0? -1 : 1);
+}
+
+int count_sign_changes(const vector<int> &vec) {
+    int c = 0;
+    for (size_t i = 1; i < vec.size(); i++) {
+        c += sign(vec[i-1]) != sign(vec[i]);
+    }
+    return c;
+}
+
+vector<int> read_vec(istream &reader) {
+    vector<int> out;
+    while (!reader.eof() && reader.good()) {
+        int i;
+        reader >> i;
+        out.push_back(i);
+    }
+    return out;
+}
+
+// -5 1 1 -5 1
+int main() {
+    ifstream inf("in.txt");
+    if (!inf.is_open())
+    {
+        cerr << "Unable to open file" << endl;
+        return 1;
+    }
+    vector<int> v = read_vec(inf);
+    int c = count_sign_changes(v);
+    cout << "Count of changes: " << c << endl;
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/9/28.cpp b/1sem/adaptation courses/9/28.cpp
new file mode 100644
index 0000000..f211b82
--- /dev/null
+++ b/1sem/adaptation courses/9/28.cpp	
@@ -0,0 +1,43 @@
+// ac_9_28.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <fstream>
+#include <vector>
+#include <cmath>
+
+using namespace std;
+
+float nearest_int_dist(float x) {
+    return abs(round(x) - x);
+}
+
+vector<float> read_vec(istream &reader) {
+    vector<float> out;
+    while (!reader.eof() && reader.good()) {
+        float i;
+        reader >> i;
+        out.push_back(i);
+    }
+    return out;
+}
+
+// 0.1 -0.1 0.4 4.0
+int main() {
+    ifstream inf("in.txt");
+    if (!inf.is_open())
+    {
+        cerr << "Unable to open file" << endl;
+        return 1;
+    }
+    vector<float> v = read_vec(inf);
+    size_t index = -1;
+    float smallest = 1e38f;
+    for (size_t i = 0; i < v.size(); i++) {
+        if (nearest_int_dist(v[i]) < smallest) {
+            smallest = nearest_int_dist(v[i]);
+            index = i;
+        }
+    }
+    cout << "Nearest to decimal form: " << v[index] << endl;
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/adaptation courses/9/29.cpp b/1sem/adaptation courses/9/29.cpp
new file mode 100644
index 0000000..ae86c69
--- /dev/null
+++ b/1sem/adaptation courses/9/29.cpp	
@@ -0,0 +1,48 @@
+// ac_9_29.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <fstream>
+#include <vector>
+
+using namespace std;
+
+void move_positive_first(vector<float> &vec) {
+    bool flag;
+    do {
+        flag = false;
+        for (size_t i = 0; i < vec.size() - 1; i++) {
+            if (vec[i] < 0 && vec[i+1] > 0) {
+                swap(vec[i], vec[i+1]);
+                flag = true;
+            }
+        }
+    } while (flag);
+}
+
+vector<float> read_vec(istream &reader) {
+    vector<float> out;
+    while (!reader.eof() && reader.good()) {
+        float i;
+        reader >> i;
+        out.push_back(i);
+    }
+    return out;
+}
+
+// 0.1 -0.1 0.4 4.0
+int main() {
+    ifstream inf("in.txt");
+    if (!inf.is_open())
+    {
+        cerr << "Unable to open file" << endl;
+        return 1;
+    }
+    vector<float> v = read_vec(inf);
+    move_positive_first(v);
+    cout << "Resulting vector: ";
+    for (float f : v) {
+        cout << f << " ";
+    }
+    cout << endl;
+    return 0;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/1/0.cpp b/1sem/programming basics/1/0.cpp
new file mode 100644
index 0000000..73fd4d6
--- /dev/null
+++ b/1sem/programming basics/1/0.cpp	
@@ -0,0 +1,13 @@
+// pb_1_0.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cstdio>
+#include <clocale>
+using namespace std;
+
+int main()
+{
+	setlocale(LC_ALL, "russian");
+	cout << "Hello World!\n";
+	printf("Привет Мир!");
+}
diff --git a/1sem/programming basics/10/100.cpp b/1sem/programming basics/10/100.cpp
new file mode 100644
index 0000000..2eda725
--- /dev/null
+++ b/1sem/programming basics/10/100.cpp	
@@ -0,0 +1,126 @@
+// pb_10_25.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+#include <vector>
+using namespace std;
+
+const double EPS = 0.001;
+const int RIGHT_UP = 1,
+          RIGHT_DW = 2,
+          LEFT_DW  = 3,
+          LEFT_UP = 4;
+
+double inline v_len(double x, double y) {
+    return sqrt(pow(x, 2) + pow(y, 2));
+}
+
+int inline get_quad(double x, double y) {
+    if (x >= 0 && y >= 0) {
+        return RIGHT_UP;
+    }
+    if (x >= 0 && y <= 0) {
+        return RIGHT_DW;
+    }
+    if (x <= 0 && y <= 0) {
+        return LEFT_DW;
+    }
+    if (x <= 0 && y >= 0) {
+        return LEFT_UP;
+    }
+}
+
+double *read_array(int len) {
+    auto *p = new double[len]();
+    cout << "Input " << len << " numbers >>>";
+    for (int i = 0; i < len; i++) {
+        cin >> *(p + i);
+    }
+    return p;
+}
+
+void print_array(const double *p, int len) {
+    cout << "array[] = ";
+    for (int i = 0; i < len; i++) {
+        cout << *(p + i) << " ";
+    }
+    cout << endl;
+}
+
+void sort(double *p, int len, bool asc) {
+    bool mod;
+    do {
+        mod = false;
+        for (int i = 0; i < len-1; i++) {
+            if (*(p + i) > *(p + i + 1) && asc) {
+                swap(*(p + i), *(p + i + 1));
+                mod = true;
+            }
+            else if (*(p + i) < *(p + i + 1) && !asc) {
+                swap(*(p + i), *(p + i + 1));
+                mod = true;
+            }
+        }
+    } while (mod);
+}
+
+double *my_task(const double *A, const double *B, int len) {
+    auto *C = new double[len]();
+    for (int i = 0; i < len; i++) {
+        *(C + i) = v_len(*(A + i), *(B + i));
+    }
+    return C;
+}
+
+void find_nearest_triplet(const double *A, const double *B, int len) {
+    double dist = 0;
+    vector<int> triplet;
+    for (int i = 0; i < len; i++) {
+        dist = v_len(*(A + i), *(B + i));
+        triplet.push_back(i);
+        for (int j = 0; j < len; j++) {
+            if (triplet.size() > 2) break;
+            if (i == j) continue;
+            if (abs(v_len(*(A + j), *(B + j)) - dist) < EPS) {
+                if (get_quad(*(A + j), *(B + j)) != get_quad(*(A + i), *(B + i))) {
+                    triplet.push_back(j);
+                }
+            }
+        }
+        if (triplet.size() == 3) {
+            cout << "Three equally-distant dots:" << endl;
+            for (int pos : triplet) {
+                cout << "\t" << pos << "(" << *(A + pos) << ", " << *(B + pos) << ")" << endl;
+            }
+            cout << "With distance = " << dist << endl;
+            return;
+        }
+        triplet.clear();
+    }
+    cout << "No three equally-distant dots found." << endl;
+}
+
+int main() {
+    int len;
+    bool asc;
+    cout << "len >>>";
+    cin >> len;
+    cout << "asc[0, 1] >>>";
+    cin >> asc;
+    double *A = read_array(len);
+    double *B = read_array(len);
+    double *C = my_task(A, B, len);
+    cout << "Before sort():" << endl;
+    print_array(A, len);
+    print_array(B, len);
+    print_array(C, len);
+    sort(A, len, asc);
+    sort(B, len, asc);
+    sort(C, len, asc);
+    cout << "After sort():" << endl;
+    print_array(A, len);
+    print_array(B, len);
+    print_array(C, len);
+
+    find_nearest_triplet(A, B, len);
+}
\ No newline at end of file
diff --git a/1sem/programming basics/2/0.cpp b/1sem/programming basics/2/0.cpp
new file mode 100644
index 0000000..2b6ff83
--- /dev/null
+++ b/1sem/programming basics/2/0.cpp	
@@ -0,0 +1,18 @@
+// pb_2_0.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+using namespace std;
+
+int main() {
+    long a, b;
+    printf("Input `a` and `b` >>>");
+    scanf("%ld %ld", &a, &b);
+    long sum = a + b;
+    long diff = a - b;
+    long multiplication = a * b;
+    printf("Sum(%%ld): %ld \nMultiplication(%%10ld): %10ld \nDifference(%%-10ld): %-10ld\n",
+           sum, multiplication, diff);
+    double mean = (float)(a + b) / 2.f;
+    printf("Mean:\n%%f: %f\n%%15.4f: %15.4f\n%%-15.4f: %-15.4f\n%%0.15f: %0.15f\n%%30.15f: %30.15f",
+           mean, mean, mean, mean, mean);
+}
\ No newline at end of file
diff --git a/1sem/programming basics/2/1.cpp b/1sem/programming basics/2/1.cpp
new file mode 100644
index 0000000..032506c
--- /dev/null
+++ b/1sem/programming basics/2/1.cpp	
@@ -0,0 +1,16 @@
+// pb_2_1.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+#include <cmath>
+using namespace std;
+
+int main() {
+    double x1, y1, x2, y2, x3, y3;
+    printf("x1 y1 x2 y2 x3 y3 >>>");
+    scanf("%lf %lf %lf %lf %lf %lf", &x1, &y1, &x2, &y2, &x3, &y3);
+    double S = ((x1 - x3)*(y2 - y3) - (x2 - x3)*(y2 - y3)) / 2.f;
+    //       1  | x1-x3    y1-y3 |
+    //  S = --- |                |
+    //       2  | x2-y3    y2-y3 |
+    printf("S=%f", abs(S));
+}
\ No newline at end of file
diff --git a/1sem/programming basics/2/2.cpp b/1sem/programming basics/2/2.cpp
new file mode 100644
index 0000000..a6a81f0
--- /dev/null
+++ b/1sem/programming basics/2/2.cpp	
@@ -0,0 +1,14 @@
+// pb_2_2.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+#include <cmath>
+using namespace std;
+
+int main() {
+    int deg;
+    printf("deg >>>");
+    scanf("%d", &deg);
+    int elapsedHours = deg / 30;
+    int elapsedMinutes = elapsedHours*60 + deg / 6;
+    printf("Elapsed hours: %d \nElapsed minutes: %d", elapsedHours, elapsedMinutes);
+}
\ No newline at end of file
diff --git a/1sem/programming basics/3/0.cpp b/1sem/programming basics/3/0.cpp
new file mode 100644
index 0000000..007cf17
--- /dev/null
+++ b/1sem/programming basics/3/0.cpp	
@@ -0,0 +1,37 @@
+// pb_3_0.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+#include <cmath>
+#include <clocale>
+#include <afxres.h>
+#include <iostream>
+
+using namespace std;
+
+int main() {
+    SetConsoleCP(CP_UTF8);
+    SetConsoleOutputCP(CP_UTF8);
+    setlocale(LC_ALL, "ru_RU.UTF-8");
+
+    double phi = 1.618033988749894848204586834365638117720309179805762862135;
+
+    cout.width(20);
+    cout << phi << endl;
+
+    cout.precision(20);
+    cout << phi << endl;
+
+    cout.precision(3);
+    cout.width(20);
+    cout.fill('_');
+    cout << phi << endl;
+
+    cout.fill('_');
+    cout.width(30);
+    cout.setf(ios_base::left);
+    cout << phi << endl;
+    cout.fill('_');
+    cout.width(30);
+    cout.setf(ios_base::right);
+    cout << phi << endl;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/3/1.cpp b/1sem/programming basics/3/1.cpp
new file mode 100644
index 0000000..bb04954
--- /dev/null
+++ b/1sem/programming basics/3/1.cpp	
@@ -0,0 +1,20 @@
+// pb_3_1.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+#include <cmath>
+#include <clocale>
+#include <afxres.h>
+
+using namespace std;
+
+int main() {
+    SetConsoleCP(CP_UTF8);
+    SetConsoleOutputCP(CP_UTF8);
+    setlocale(LC_ALL, "ru_RU.UTF-8");
+
+    double x1, y1, x2, y2, x3, y3;
+    printf("x1 y1 x2 y2 x3 y3 >>>");
+    scanf("%lf %lf %lf %lf %lf %lf", &x1, &y1, &x2, &y2, &x3, &y3);
+    bool ool = ((x2-x1)*(y3-y1) == (y2-y1)*(x3-x1));
+    printf(ool? "YES" : "NO");
+}
\ No newline at end of file
diff --git a/1sem/programming basics/4/1_60.cpp b/1sem/programming basics/4/1_60.cpp
new file mode 100644
index 0000000..1d0b71f
--- /dev/null
+++ b/1sem/programming basics/4/1_60.cpp	
@@ -0,0 +1,27 @@
+// pb_4_1_60.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <clocale>
+#include <cmath>
+using namespace std;
+
+double f1(double x)
+{
+    x = x + 3.14;
+    return x;
+}
+double f2(double x)
+{
+    x = sqrt(x*x + 2);
+    return x;
+}
+int main()
+{
+    double x;
+    cout << "X=?\n";
+    cin >> x;
+    cout << "y=" << f1(x) + f1(x*x) + f2(x) + f2(x-1) << endl;
+}
+
+// 1 11.4263
+// 2 16.4615
\ No newline at end of file
diff --git a/1sem/programming basics/4/2_40.cpp b/1sem/programming basics/4/2_40.cpp
new file mode 100644
index 0000000..0feb379
--- /dev/null
+++ b/1sem/programming basics/4/2_40.cpp	
@@ -0,0 +1,31 @@
+// pb_4_2_40.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <clocale>
+#include <cmath>
+using namespace std;
+
+double f1(double x)
+{
+    x = log(x*x) - 8.3e3;
+    return x;
+}
+double f2(double x)
+{
+    x = 1 / (cbrt(3*x) + 1);
+    return x;
+}
+int main()
+{
+    double x;
+    cout << "X=?\n";
+    cin >> x;
+    if (x == 0) {
+        cout << "err: x == 0" << endl;
+        return 0;
+    }
+    cout << "y=" << f1(x) + f2(x) << endl;
+}
+
+// 1 -8299.59
+// 2 -8298.26
\ No newline at end of file
diff --git a/1sem/programming basics/5/0_60.cpp b/1sem/programming basics/5/0_60.cpp
new file mode 100644
index 0000000..cc54f31
--- /dev/null
+++ b/1sem/programming basics/5/0_60.cpp	
@@ -0,0 +1,20 @@
+// pb_5_0_60.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+int main() {
+    int N;
+    cout << "N >>";
+    cin >> N;
+    cout << "With for(...)>>>" << endl;
+    for (int i = 1; i <= N; i++) cout << i << endl;
+    cout << endl;
+    cout << "With while(...)>>>" << endl;
+    int wi = 1;
+    while (wi <= N) cout << wi++ << endl;
+    cout << endl;
+    cout << "With do{...}while(...)>>>" << endl;
+    int dwi = 1;
+    do { cout << dwi++ << endl; } while (dwi <= N);
+}
diff --git a/1sem/programming basics/5/1_40.cpp b/1sem/programming basics/5/1_40.cpp
new file mode 100644
index 0000000..8da6bc5
--- /dev/null
+++ b/1sem/programming basics/5/1_40.cpp	
@@ -0,0 +1,20 @@
+// pb_5_1_40.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+int gcd (int a, int b) {
+    while (b) {
+        a %= b;
+        swap(a, b);
+    }
+    return a;
+}
+
+
+int main() {
+    int a, b, c;
+    cout << "a, b, c >>";
+    cin >> a >> b >> c;
+    cout << (gcd(gcd(a,b),c) == 1? "YES" : "NO") << endl;
+}
diff --git a/1sem/programming basics/6/2_100.cpp b/1sem/programming basics/6/2_100.cpp
new file mode 100644
index 0000000..3bfcc70
--- /dev/null
+++ b/1sem/programming basics/6/2_100.cpp	
@@ -0,0 +1,44 @@
+// pb_6_2_100.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+double arctg(double, double);
+double mant(double);
+
+int main() {
+    double x, d;
+    cout << "x, d >>>";
+    cin >> x >> d;
+    if ((x < -1) or (x > 1)) {
+        cout << "err: x not in range";
+        return 0;
+    }
+
+    double oarctg = arctg(x, d);
+    double carctg = atan(x);
+    cout << "  own arctg(x) = " << oarctg << endl;
+    cout << "cmath arctg(x) = " << carctg << endl;
+    cout << "          diff = " << oarctg - carctg << endl;
+}
+
+double arctg(double x, double delta) {
+    double out = x;
+    double px = x;
+    int den = 1;
+    bool neg = false;
+    double pout = out + 0.1f;
+    while (abs(mant(out)-mant(pout)) > delta) {
+        pout = out;
+        neg = !neg;
+        x *= px*px;
+        den += 2;
+        out += x/den * (neg? -1 : 1);
+    }
+    return out;
+}
+
+double mant(double num) {
+    return num - (int)num;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/7/2_100.cpp b/1sem/programming basics/7/2_100.cpp
new file mode 100644
index 0000000..33779ad
--- /dev/null
+++ b/1sem/programming basics/7/2_100.cpp	
@@ -0,0 +1,43 @@
+// pb_7_2_100.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+double f(double);
+void pp (double, double);
+
+int main() {
+    double a, b, h;
+    bool mono_decreasing = true;
+    cout << "a, b, h >>>";
+    cin >> a >> b >> h;
+    double last_y = f(a);
+    for (; a < b; a += h) {
+        double y = f(a);
+        pp(a, y);
+        if (last_y < y) {
+            mono_decreasing = false;
+        }
+        else {
+            last_y = y;
+        }
+    }
+    cout << "Monotonously decreasing? " << (mono_decreasing? "YES" : "NO") << endl;
+}
+
+double f(double x) {
+    return x * cos(3 * x ) - 2;
+}
+
+void pp (double x, double y) {
+    cout.setf(ios_base::right);
+    cout.fill(' ');
+    cout.width(10);
+    cout << x;
+    cout.width(15);
+    cout << y << endl;
+}
+
+// -99 -98.5 0.02 for yes
+// 0 0.5 0.02 for no
\ No newline at end of file
diff --git a/1sem/programming basics/8/2_100.cpp b/1sem/programming basics/8/2_100.cpp
new file mode 100644
index 0000000..6d9f753
--- /dev/null
+++ b/1sem/programming basics/8/2_100.cpp	
@@ -0,0 +1,60 @@
+// pb_8_2_100.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+int *read_array(int len)
+{
+    int *out = new int[len];
+    for (int i = 0; i < len; i++)
+    {
+        cout << "arr[" << i << "] >>>";
+        cin >> out[i];
+    }
+    return out;
+}
+
+void print_array(int arr[], int len) {
+    for (int i = 0; i < len; i++) {
+        cout << arr[i] << " ";
+    }
+    cout << endl;
+}
+
+int my_task(const int A[], int lenA, int B[], int lenB) {
+    int actbs = 0;
+    int indx = -1;
+    int *p = new int[lenB];
+    for (int i = lenA; i >= 0;) {
+        i -= 1;
+        if (A[i] >= 0) {
+            indx = i;
+            break;
+        }
+        p[actbs++] = A[i];
+    }
+    delete[] B;
+    B = new int[actbs];
+    for (int i = 0; i < actbs; i++) {
+        B[i] = p[actbs-i-1];
+    }
+    return indx;
+}
+
+int main()
+{
+    int len;
+    cout << "len >>>";
+    cin >> len;
+    int *a1 = read_array(len);
+    int *b = new int[len];
+    int indx = my_task(a1, len, b, len);
+    if (indx > -1) {
+        cout << "Last positive: " << indx;
+    }
+    else {
+        cout << "No positive elements";
+    }
+    cout << endl << "B = ";
+    print_array(b, len-1-indx);
+}
\ No newline at end of file
diff --git a/1sem/programming basics/9/100.cpp b/1sem/programming basics/9/100.cpp
new file mode 100644
index 0000000..ef4db72
--- /dev/null
+++ b/1sem/programming basics/9/100.cpp	
@@ -0,0 +1,60 @@
+// pb_9_100.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+int *read_array(int len)
+{
+    int *out = new int[len];
+    for (int i = 0; i < len; i++)
+    {
+        cout << "arr[" << i << "] >>>";
+        cin >> *(out + i);
+    }
+    return out;
+}
+
+void print_array(const int *arr, int len) {
+    for (int i = 0; i < len; i++) {
+        cout << *(arr + i) << " ";
+    }
+    cout << endl;
+}
+
+int my_task(const int *A, int lenA, int *B, int lenB) {
+    int actbs = 0;
+    int indx = -1;
+    int *p = new int[lenB];
+    for (int i = lenA; i >= 0;) {
+        i -= 1;
+        if (*(A + i) >= 0) {
+            indx = i;
+            break;
+        }
+        *(p + actbs++) = *(A + i);
+    }
+    delete[] B;
+    B = new int[actbs];
+    for (int i = 0; i < actbs; i++) {
+        *(B + i) = *(p + (actbs-i-1));
+    }
+    return indx;
+}
+
+int main()
+{
+    int len;
+    cout << "len >>>";
+    cin >> len;
+    int *a1 = read_array(len);
+    int *b = new int[len];
+    int indx = my_task(a1, len, b, len);
+    if (indx > -1) {
+        cout << "Last positive: " << indx;
+    }
+    else {
+        cout << "No positive elements";
+    }
+    cout << endl << "B = ";
+    print_array(b, len-1-indx);
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z1/1.cpp b/1sem/programming basics/z1/1.cpp
new file mode 100644
index 0000000..e5acdcc
--- /dev/null
+++ b/1sem/programming basics/z1/1.cpp	
@@ -0,0 +1,13 @@
+// pb_z1_1.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+#include <algorithm>
+using namespace std;
+
+int main() {
+    int a, b;
+    printf("a b >>>");
+    scanf("%d %d", &a, &b);
+    swap(a, b);
+    printf("a=%d \nb=%d", a, b);
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z1/2.cpp b/1sem/programming basics/z1/2.cpp
new file mode 100644
index 0000000..09eca09
--- /dev/null
+++ b/1sem/programming basics/z1/2.cpp	
@@ -0,0 +1,15 @@
+// pb_z1_2.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+using namespace std;
+
+int main() {
+    int num_people, num_seats, num_buses, num_free_seats;
+    printf("People count seats count >>>");
+    scanf("%d %d", &num_people, &num_seats);
+    num_buses = num_people / num_seats;
+    bool additional_seats = num_people % num_seats > 0;
+    num_buses += additional_seats;
+    num_free_seats = num_buses * num_seats - num_people;
+    printf("Busses count: %d\nFree seats: %d\n", num_buses, num_free_seats);
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z1/3.cpp b/1sem/programming basics/z1/3.cpp
new file mode 100644
index 0000000..326d709
--- /dev/null
+++ b/1sem/programming basics/z1/3.cpp	
@@ -0,0 +1,14 @@
+// pb_z1_3.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+#include <cmath>
+#include <algorithm>
+using namespace std;
+
+int main() {
+    double d;
+    printf("d >>>");
+    scanf("%lf", &d);
+    d = ((int)(abs(d) * 10)) % 10;
+    printf("%d", (int)d);
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z10/28.cpp b/1sem/programming basics/z10/28.cpp
new file mode 100644
index 0000000..cc50b75
--- /dev/null
+++ b/1sem/programming basics/z10/28.cpp	
@@ -0,0 +1,61 @@
+// pb_z10_28.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <vector>
+#include <cstring>
+
+#define MAX_STR 5000
+using namespace std;
+
+void rstrip(char*, const char*);
+char* get_string();
+void println_string(const char*);
+
+int main() {
+    char *s, *chars;
+    cout << "Input string:" << endl;
+    s = get_string();
+    cout << "Input chars:" << endl;
+    chars = get_string();
+    cout << "String before:" << endl;
+    println_string(s);
+    rstrip(s, chars);
+    cout << "String after:" << endl;
+    println_string(s);
+}
+
+void rstrip(char *s, const char *chars) {
+    int rpad = 0;
+    int i = (int)strlen(s)-1;
+    bool found;
+    do {
+        found = false;
+        char cc = *(s + i--);
+        for (size_t j = 0; j < strlen(chars); j++) {
+            if (cc == *(chars + j)) {
+                rpad += 1;
+                found = true;
+                *(s + i+1) = '\0';
+                break;
+            }
+        }
+    } while (found && i >= 0);
+}
+
+char* get_string() {
+    int c = 0;
+    char *s = new char[MAX_STR];
+    char ch;
+    while ((ch = cin.get()) != '\n') {
+        *(s + c++) = ch;
+    }
+    *(s + c) = '\0';
+    return s;
+}
+
+void println_string(const char* s) {
+    for (size_t i = 0; i < strlen(s); i++) {
+        cout << *(s + i);
+    }
+    cout << endl;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z10/29.cpp b/1sem/programming basics/z10/29.cpp
new file mode 100644
index 0000000..59b3c1e
--- /dev/null
+++ b/1sem/programming basics/z10/29.cpp	
@@ -0,0 +1,85 @@
+// pb_z10_29.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <vector>
+#include <cstring>
+
+#define MAX_STR 5000
+using namespace std;
+
+void strip(char*, const char*);
+char* get_string();
+void println_string(const char*);
+
+int main() {
+    char *s, *chars;
+    cout << "Input string:" << endl;
+    s = get_string();
+    cout << "Input chars:" << endl;
+    chars = get_string();
+    cout << "String before:" << endl;
+    println_string(s);
+    strip(s, chars);
+    cout << "String after:" << endl;
+    println_string(s);
+}
+
+void strip(char *s, const char *chars) {
+    int lpad = 0;
+    int fi = 0;
+    bool found;
+    do {
+        found = false;
+        char cc = *(s + fi);
+        for (size_t j = 0; j < strlen(chars); j++) {
+            if (cc == *(chars + j)) {
+                lpad += 1;
+                found = true;
+                break;
+            }
+        }
+        fi++;
+    } while(found && fi >= 0);
+    if(lpad > 0)
+    {
+        size_t i;
+        for (i = 0; i < strlen(s) - lpad; i++)
+        {
+            *(s + i) = *(s + i + lpad);
+        }
+        *(s + i) = '\0';
+    }
+
+    int rpad = 0;
+    int ei = (int)strlen(s)-1;
+    do {
+        found = false;
+        char cc = *(s + ei--);
+        for (size_t j = 0; j < strlen(chars); j++) {
+            if (cc == *(chars + j)) {
+                rpad += 1;
+                found = true;
+                *(s + ei + 1) = '\0';
+                break;
+            }
+        }
+    } while (found && ei >= 0);
+}
+
+char* get_string() {
+    int c = 0;
+    char *s = new char[MAX_STR];
+    char ch;
+    while ((ch = cin.get()) != '\n') {
+        *(s + c++) = ch;
+    }
+    *(s + c) = '\0';
+    return s;
+}
+
+void println_string(const char* s) {
+    for (size_t i = 0; i < strlen(s); i++) {
+        cout << *(s + i);
+    }
+    cout << endl;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z10/30.cpp b/1sem/programming basics/z10/30.cpp
new file mode 100644
index 0000000..a724b1f
--- /dev/null
+++ b/1sem/programming basics/z10/30.cpp	
@@ -0,0 +1,70 @@
+// pb_z10_30.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <vector>
+#include <cstring>
+
+#define MAX_STR 5000
+using namespace std;
+
+size_t join(char*, size_t , const char*const*, size_t, const char*);
+char* get_string();
+char** get_string_list(size_t);
+void println_string(const char*);
+
+int main() {
+    size_t n_in;
+    cout << "Count of strings >>>";
+    cin >> n_in;
+    cout << "Strings:" << endl;
+    char **s_in = get_string_list(n_in+1);
+    cout << "Joiner separator >>>";
+    char *sep = get_string();
+    cout << "Max length >>>";
+    size_t len;
+    cin >> len;
+    char *s_out = new char[len];
+    size_t f_len = join(s_out, len, s_in, n_in, sep);
+    cout << "Joined string:" << endl;
+    println_string(s_out);
+}
+
+size_t join(char *s_out, size_t len, const char *const *s_in, size_t n_in, const char *sep) {
+    string ps_out;
+    ps_out += string(*(s_in + 1));
+    for (size_t i = 2; i <= n_in; i++) {
+        ps_out += string(sep) + string(*(s_in + i));
+    }
+    size_t mnl = min(len, ps_out.length());
+    for (size_t i = 0; i < mnl; i++) {
+        *(s_out + i) = ps_out.c_str()[i];
+    }
+    *(s_out + mnl) = '\0';
+    return strlen(s_out);
+}
+
+char** get_string_list(size_t count) {
+    char **arr = new char*[count];
+    for (size_t i = 0; i < count; i++) {
+        *(arr + i) = get_string();
+    }
+    return arr;
+}
+
+char* get_string() {
+    int c = 0;
+    char *s = new char[MAX_STR];
+    char ch;
+    while ((ch = cin.get()) != '\n') {
+        *(s + c++) = ch;
+    }
+    *(s + c) = '\0';
+    return s;
+}
+
+void println_string(const char* s) {
+    for (size_t i = 0; i < strlen(s); i++) {
+        cout << *(s + i);
+    }
+    cout << endl;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z2/4.cpp b/1sem/programming basics/z2/4.cpp
new file mode 100644
index 0000000..89d9738
--- /dev/null
+++ b/1sem/programming basics/z2/4.cpp	
@@ -0,0 +1,24 @@
+// pb_z2_4.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+#include <cmath>
+#include <clocale>
+#include <afxres.h>
+
+using namespace std;
+
+int main() {
+    SetConsoleCP(CP_UTF8);
+    SetConsoleOutputCP(CP_UTF8);
+    setlocale(LC_ALL, "ru_RU.UTF-8");
+
+    double x, a, b, c, d;
+    printf("x [a b] [c d] >>");
+    scanf("%lf %lf %lf %lf %lf", &x, &a, &b, &c, &d);
+    if ((fmin(a, b) <= x && x <= fmax(a, b)) || (fmin(c, d) <= x && x <= fmax(c, d))) {
+        printf("Принадлежит");
+    }
+    else {
+        printf("Не принадлежит");
+    };
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z2/5.cpp b/1sem/programming basics/z2/5.cpp
new file mode 100644
index 0000000..901450b
--- /dev/null
+++ b/1sem/programming basics/z2/5.cpp	
@@ -0,0 +1,33 @@
+// pb_z2_5.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+#include <cmath>
+#include <clocale>
+#include <afxres.h>
+
+using namespace std;
+
+int main() {
+    SetConsoleCP(CP_UTF8);
+    SetConsoleOutputCP(CP_UTF8);
+    setlocale(LC_ALL, "ru_RU.UTF-8");
+
+    double a1, a2, b1, b2;
+    printf("[a1 a2] [b1, b2] >>");
+    scanf("%lf %lf %lf %lf", &a1, &a2, &b1, &b2);
+    if (fmin(a1, a2) == fmin(b1, b2) && fmax(a1, a2) == fmax(b1, b2)) {
+        printf("А равно B");
+    }
+    else if (fmin(a1, a2) >= fmin(b1, b2) && fmax(a1, a2) <= fmax(b1, b2)) {
+        printf("А внутри B");
+    }
+    else if (fmin(b1, b2) >= fmin(a1, a2) && fmax(b1, b2) <= fmax(a1, a2)) {
+        printf("B внутри A");
+    }
+    else if ((fmin(b1, b2) <= fmin(a1, a2) && fmin(a1, a2) <= fmax(b1, b2)) || (fmin(b1, b2) <= fmax(a1, a2) && fmax(a1, a2) <= fmax(b1, b2))) {
+        printf("Другое пересечение");
+    }
+    else {
+        printf("Нет пересечения");
+    }
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z2/6.cpp b/1sem/programming basics/z2/6.cpp
new file mode 100644
index 0000000..a45b4e1
--- /dev/null
+++ b/1sem/programming basics/z2/6.cpp	
@@ -0,0 +1,32 @@
+// pb_z2_6.cpp
+// Горбацевич Андрей
+#include <stdio.h>
+#include <cmath>
+#include <clocale>
+#include <afxres.h>
+
+using namespace std;
+
+int main() {
+    SetConsoleCP(CP_UTF8);
+    SetConsoleOutputCP(CP_UTF8);
+    setlocale(LC_ALL, "ru_RU.UTF-8");
+
+    double a, b, c, d;
+    printf("a b c >>");
+    scanf("%lf %lf %lf", &a, &b, &c);
+    if (a == 0) {
+        printf("Недопустимое значение `a`");
+        return 0;
+    }
+    d = b*b-4*a*c;
+    if (d < 0) {
+        printf("Действительных корней нет");
+    }
+    else if (d == 0) {
+        printf("x= %lf", -b/(2*a));
+    }
+    else {
+        printf("x1= %lf\nx2= %lf", (-b+sqrt(d))/(2*a), (-b-sqrt(d))/(2*a));
+    }
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z3/7.cpp b/1sem/programming basics/z3/7.cpp
new file mode 100644
index 0000000..6de7beb
--- /dev/null
+++ b/1sem/programming basics/z3/7.cpp	
@@ -0,0 +1,19 @@
+// pb_z3_7.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+int find_most_frequent(int a, int b, int c, int d)
+{
+	int s;
+	s = a + b + c + d;
+	return (s == 2 ? -1 : (s > 2 ? 1 : 0));
+}
+
+int main()
+{
+	int a, d, c, b;
+	cout << ("a,b,c,d=?");
+	cin >> a >> b >> c >> d;
+	cout << find_most_frequent(a, b, c, d);
+}
diff --git a/1sem/programming basics/z3/8.cpp b/1sem/programming basics/z3/8.cpp
new file mode 100644
index 0000000..528685d
--- /dev/null
+++ b/1sem/programming basics/z3/8.cpp	
@@ -0,0 +1,24 @@
+// pb_z3_8.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+float inline sqr(float i) 
+{
+	return i * i;
+}
+
+float dist(float x1, float y1, float x2, float y2)
+{
+	float d = sqrt(sqr(x2 - x1) + sqr(y2 - y1));
+	return d;
+}
+
+int main()
+{
+	float x1, y1, x2, y2;
+	cout << "x1,y1,x2,y2\n";
+	cin >> x1>> y1 >> x2 >> y2;
+	cout << dist(x1, y1, x2, y2);
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z3/9.cpp b/1sem/programming basics/z3/9.cpp
new file mode 100644
index 0000000..60acde1
--- /dev/null
+++ b/1sem/programming basics/z3/9.cpp	
@@ -0,0 +1,22 @@
+// pb_z3_9.cpp
+// Горбацевич Андрей
+#include <cmath>
+#include <iostream>
+#include<algorithm>
+using namespace std;
+
+float min_or_max(float a, float b, float c)
+{
+    if (a > 0.5)
+        return max(b, c);
+    else
+        return min(b, c);
+}
+
+int main()
+{
+    float a, b, c;
+    cin >> a >> b >> c;
+    float d = min_or_max(a, b, c);
+    cout << d << endl;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z4/10.cpp b/1sem/programming basics/z4/10.cpp
new file mode 100644
index 0000000..28aa049
--- /dev/null
+++ b/1sem/programming basics/z4/10.cpp	
@@ -0,0 +1,17 @@
+// pb_z4_10.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+int main() {
+    int a;
+    cin >> a;
+    cout << a << endl;
+    do {
+        int b;
+        cin >> b;
+        if (a > b) break;
+        cout << b << endl;
+        a = b;
+    } while (true);
+}
diff --git a/1sem/programming basics/z4/11.cpp b/1sem/programming basics/z4/11.cpp
new file mode 100644
index 0000000..48e0d39
--- /dev/null
+++ b/1sem/programming basics/z4/11.cpp	
@@ -0,0 +1,20 @@
+// pb_z4_11.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+void print_diag(int s) {
+    for (int i = 0; i < s; i++) {
+        for (int j = 0; j < i; j++) {
+            cout << " ";
+        }
+        cout << "*" << endl;
+    }
+}
+
+int main() {
+    int a;
+    cout << "a >>";
+    cin >> a;
+    print_diag(a);
+}
diff --git a/1sem/programming basics/z4/12.cpp b/1sem/programming basics/z4/12.cpp
new file mode 100644
index 0000000..f14705e
--- /dev/null
+++ b/1sem/programming basics/z4/12.cpp	
@@ -0,0 +1,22 @@
+// pb_z4_12.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+void print_rect(int x, int y, int sx, int sy) {
+    cout << "<<<  printing rect  >>>" << endl;
+    for (int i = 0; i < y; i++) cout << endl;
+    for (int i = 0; i < sy; i++) {
+        for (int j = 0; j < x; j++) cout << " ";
+        for (int j = 0; j < sx; j++) cout << "@";
+        cout << endl;
+    }
+    cout << "<<<done printing rect>>>" << endl;
+}
+
+int main() {
+    int x, y, sx, sy;
+    cout << "x, y, sx, sy >>";
+    cin >> x >> y >> sx >> sy;
+    print_rect(x, y, sx, sy);
+}
diff --git a/1sem/programming basics/z5/13.cpp b/1sem/programming basics/z5/13.cpp
new file mode 100644
index 0000000..b52bec9
--- /dev/null
+++ b/1sem/programming basics/z5/13.cpp	
@@ -0,0 +1,20 @@
+// pb_z5_13.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+double ai(int);
+
+int main() {
+    int N;
+    cout << "N >>>";
+    cin >> N;
+    cout << "S= " << ai(N);
+}
+
+double ai(int N) {
+    double out = 0;
+    for (int i = 1; i <= N; i++)
+        out += (float)i/((float)i+1.f);
+    return out;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z5/14.cpp b/1sem/programming basics/z5/14.cpp
new file mode 100644
index 0000000..4617533
--- /dev/null
+++ b/1sem/programming basics/z5/14.cpp	
@@ -0,0 +1,28 @@
+// pb_z5_14.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+double ai(int, double);
+double spow(double, double);
+
+int main() {
+    int N;
+    double x;
+    cout << "N, x >>>";
+    cin >> N >> x;
+    cout << "P= " << ai(N, x);
+}
+
+double ai(int N, double x) {
+    double out = 1;
+    for (int i = 1; i <= N; i++)
+        out *= 2 * spow(x, i);
+    return out;
+}
+
+double spow(double f, double p) {
+    double out = 1;
+    for (int i = 0; i < p; i++) out *= f;
+    return out;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z5/15.cpp b/1sem/programming basics/z5/15.cpp
new file mode 100644
index 0000000..de68525
--- /dev/null
+++ b/1sem/programming basics/z5/15.cpp	
@@ -0,0 +1,25 @@
+// pb_z5_15.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+double ai(int);
+double s(int);
+
+int main() {
+    int N;
+    cout << "N >>>";
+    cin >> N;
+    cout << "S= " << ai(N);
+}
+
+double ai(int N) {
+    double out = 0;
+    for (int i = 1; i <= N; i++)
+        out += i * s(i);
+    return out;
+}
+
+double s(int i) {
+    return (i % 2? -1 : 1);
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z6/16.cpp b/1sem/programming basics/z6/16.cpp
new file mode 100644
index 0000000..573efa2
--- /dev/null
+++ b/1sem/programming basics/z6/16.cpp	
@@ -0,0 +1,36 @@
+// pb_z6_16.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+double f(double x) 
+{
+	return 2 * x*x - 3 * x + 1;
+}
+
+void pp(double x)
+{
+	cout.width(10);
+	cout.fill(' ');
+	cout.setf(ios_base::fixed);
+	cout.setf(ios_base::right);
+	cout << x;
+	cout.width(15);
+	cout.fill(' ');
+	cout.setf(ios_base::right);
+	cout << scientific << f(x);
+	cout << endl;
+	cout.unsetf(ios_base::scientific);
+}
+
+int main()
+{
+	double a, b, s;
+	cout << "a, b, s >>>\n"; 
+	cin >> a >> b >> s;
+	while (a <= b)
+	{
+		pp(a);
+		a += s;
+	}
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z6/17.cpp b/1sem/programming basics/z6/17.cpp
new file mode 100644
index 0000000..c2a1589
--- /dev/null
+++ b/1sem/programming basics/z6/17.cpp	
@@ -0,0 +1,44 @@
+// pb_z6_17.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <iomanip>
+using namespace std;
+
+double inline f(double x) 
+{
+	return 2 * x*x - 3 * x + 1;
+}
+
+void pp1(double x)
+{
+	cout.width(15);
+	cout.fill(' ');
+	cout.setf(ios_base::right);
+	cout.setf(ios_base::fixed);
+	cout << setprecision(3)<<x;
+}
+
+void pp2(double x)
+{
+	cout.width(15);
+	cout.fill(' ');
+	cout.setf(ios_base::right);
+	cout << scientific << setprecision(5) << f(x);
+}
+
+int main()
+{
+	double a, b, s;
+	cout << "a, b, s >>>\n"; 
+	cin >> a >> b >> s;
+	for (double _a = a; _a <= b; _a += s)
+	{
+		pp1(_a);
+	}
+	cout << endl;
+	for (double _a = a; _a <= b; _a += s)
+	{
+		pp2(_a);
+	}
+	cout << endl;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z6/18.cpp b/1sem/programming basics/z6/18.cpp
new file mode 100644
index 0000000..cc503f2
--- /dev/null
+++ b/1sem/programming basics/z6/18.cpp	
@@ -0,0 +1,33 @@
+// pb_z6_18.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+double f(double);
+void plot(double, double, int);
+
+int main() {
+    double a, b, s;
+    int scale;
+    cout << "a, b, s, scale >>>";
+    cin >> a >> b >> s >> scale;
+    while (a < b) {
+        double y = f(a);
+        int v = (int)(y * scale);
+        plot(a, y, v);
+        a += s;
+    }
+}
+
+static const double PI = acos(-1);
+double f(double x) {
+    return pow(sin(PI * x), 2);
+}
+
+void plot(double x, double y, int v) {
+    for (int i = 0; i < v; ++i) {
+        cout << " ";
+    }
+    cout << "$(" << x << ", " << y << ")" << endl;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z7/19.cpp b/1sem/programming basics/z7/19.cpp
new file mode 100644
index 0000000..ad1dffb
--- /dev/null
+++ b/1sem/programming basics/z7/19.cpp	
@@ -0,0 +1,31 @@
+// pb_z7_19.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+const int al = 100;
+
+int min(int a, int b) {
+    return (a < b? a : b);
+}
+
+void print_array(int arr[], int len)
+{
+    for (int i = 0; i < min(al, len); i++) {
+        cout << arr[i] << " ";
+    }
+    cout << endl;
+}
+
+int main()
+{
+    int count;
+    cout << "count >>>";
+    cin >> count;
+    int a[al];
+    for (int i = 0; i < al; i++)
+    {
+        a[i] = rand() % 100 + 1;
+    }
+    print_array(a, count);
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z7/20.cpp b/1sem/programming basics/z7/20.cpp
new file mode 100644
index 0000000..cf82c07
--- /dev/null
+++ b/1sem/programming basics/z7/20.cpp	
@@ -0,0 +1,32 @@
+// pb_z7_20.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+int count_equal(const int arr[], int len, int x)
+{
+    int count = 0;
+    for (int i=0; i<len; i++)
+    {
+        count += arr[i] == x;
+    }
+    return count;
+}
+
+int main()
+{
+
+    int n, x;
+    cout << "n >>>";
+    cin >>n;
+    int *a = new int[n];
+    for (int i = 0; i < n; i++)
+    {
+        cout << "a[" << i << "] >>>";
+        cin >> a[i];
+    }
+    cout << "x >>>";
+    cin >> x;
+    cout << "count of `" << x << "`: " << count_equal(a, n, x);
+    delete[] a;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z7/21.cpp b/1sem/programming basics/z7/21.cpp
new file mode 100644
index 0000000..2ffa5be
--- /dev/null
+++ b/1sem/programming basics/z7/21.cpp	
@@ -0,0 +1,45 @@
+// pb_z7_21.cpp
+// Горбацевич Андрей
+#include <iostream>
+
+using namespace std;
+
+int splice_array(const int arr1[], const int arr2[], int len, int arr_out[])
+{
+    int out = 0;
+    for (int i=0; i<len; i++)
+    {
+        arr_out[i*2] = arr1[i];
+        arr_out[i*2+1] = arr2[i];
+        out += 2;
+    }
+    return out;
+}
+
+int main()
+{
+
+    int n;
+    cout << "n >>>";
+    cin >> n;
+    int *a1 = new int[n];
+    for (int i = 0; i < n; i++)
+    {
+        cout << "a1[" << i << "] >>>";
+        cin >> a1[i];
+    }
+
+    int *a2 = new int[n];
+    for (int i = 0; i < n; i++)
+    {
+        cout << "a2[" << i << "] >>>";
+        cin >> a2[i];
+    }
+    int *a = new int[n * 2];
+    int l = splice_array(a1, a2, n, a);
+    cout << "length " << l << endl;
+    for (int i = 0; i < l; i++) {
+        cout << a[i] << " ";
+    }
+    delete[] a, a1, a2;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z8/22.cpp b/1sem/programming basics/z8/22.cpp
new file mode 100644
index 0000000..a92594d
--- /dev/null
+++ b/1sem/programming basics/z8/22.cpp	
@@ -0,0 +1,31 @@
+// pb_z8_22.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+const int al = 100;
+
+int min(int a, int b) {
+    return (a < b? a : b);
+}
+
+void print_array(int *arr, int len)
+{
+    for (int i = 0; i < min(al, len); i++) {
+        cout << *(arr + i) << " ";
+    }
+    cout << endl;
+}
+
+int main()
+{
+    int count;
+    cout << "count >>>";
+    cin >> count;
+    int *a = new int[al];
+    for (int i = 0; i < al; i++)
+    {
+        *(a + i) = rand() % 100 + 1;
+    }
+    print_array(a, count);
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z8/23.cpp b/1sem/programming basics/z8/23.cpp
new file mode 100644
index 0000000..80cbc2b
--- /dev/null
+++ b/1sem/programming basics/z8/23.cpp	
@@ -0,0 +1,31 @@
+// pb_z8_23.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+int count_equal(const int *arr, int len, int x)
+{
+    int count = 0;
+    for (int i = 0; i < len; i++)
+    {
+        count += *(arr + i) == x;
+    }
+    return count;
+}
+
+int main()
+{
+    int n, x;
+    cout << "n >>>";
+    cin >>n;
+    int *a = new int[n];
+    for (int i = 0; i < n; i++)
+    {
+        cout << "a[" << i << "] >>>";
+        cin >> *(a + i);
+    }
+    cout << "x >>>";
+    cin >> x;
+    cout << "count of `" << x << "`: " << count_equal(a, n, x);
+    delete[] a;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z8/24.cpp b/1sem/programming basics/z8/24.cpp
new file mode 100644
index 0000000..8872fe5
--- /dev/null
+++ b/1sem/programming basics/z8/24.cpp	
@@ -0,0 +1,43 @@
+// pb_z8_24.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+int splice_array(const int *arr1, const int *arr2, int len, int *arr_out)
+{
+    int out = 0;
+    for (int i=0; i<len; i++)
+    {
+        *(arr_out + i*2) = *(arr1 + i);
+        *(arr_out + i*2+1) = *(arr2 + i);
+        out += 2;
+    }
+    return out;
+}
+
+int main()
+{
+    int n;
+    cout << "n >>>";
+    cin >> n;
+    int *a1 = new int[n];
+    for (int i = 0; i < n; i++)
+    {
+        cout << "a1[" << i << "] >>>";
+        cin >> *(a1 + i);
+    }
+
+    int *a2 = new int[n];
+    for (int i = 0; i < n; i++)
+    {
+        cout << "a2[" << i << "] >>>";
+        cin >> *(a2 + i);
+    }
+    int *a = new int[n * 2];
+    int l = splice_array(a1, a2, n, a);
+    cout << "length " << l << endl;
+    for (int i = 0; i < l; i++) {
+        cout << *(a + i) << " ";
+    }
+    delete[] a, a1, a2;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z9/25.cpp b/1sem/programming basics/z9/25.cpp
new file mode 100644
index 0000000..674aa7c
--- /dev/null
+++ b/1sem/programming basics/z9/25.cpp	
@@ -0,0 +1,66 @@
+// pb_z9_25.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cstdlib>
+
+using namespace std;
+
+void sort(double arr[], int len, bool asc);
+void print_array(const double *arr, size_t len);
+double *get_array(size_t len);
+int comp_asc(const void* a, const void* b);
+int comp_desc(const void* a, const void* b);
+
+// 10 1 2 3 5 4 3 2 2 9 1 0
+int main() {
+    size_t len;
+    cout << "Array length >>>";
+    cin >> len;
+    cout << "Enter array elements >>>";
+    double *a = get_array(len);
+    bool asc;
+    cout << "Ascending sort? (1/0) >>>";
+    cin >> asc;
+    cout << "Array before: ";
+    print_array(a, len);
+    sort(a, len, asc);
+    cout << "Array after: ";
+    print_array(a, len);
+}
+
+void sort(double arr[], int len, bool asc) {
+    qsort(arr, len, sizeof(double), asc? comp_asc : comp_desc);
+}
+
+void print_array(const double *arr, size_t len) {
+    for (size_t i = 0; i < len; i++) {
+        cout << *(arr + i) << " ";
+    }
+    cout << endl;
+}
+
+double *get_array(size_t len) {
+    auto *a = new double[len];
+    for (size_t i = 0; i < len; i++) {
+        cin >> *(a + i);
+    }
+    return a;
+}
+
+int comp_asc(const void* a, const void* b) {
+    double arg1 = *(const double*)(a);
+    double arg2 = *(const double*)(b);
+
+    if(arg1 < arg2) return -1;
+    if(arg1 > arg2) return 1;
+    return 0;
+}
+
+int comp_desc(const void* a, const void* b) {
+    double arg1 = *(const double*)(a);
+    double arg2 = *(const double*)(b);
+
+    if(arg1 < arg2) return 1;
+    if(arg1 > arg2) return -1;
+    return 0;
+}
diff --git a/1sem/programming basics/z9/26.cpp b/1sem/programming basics/z9/26.cpp
new file mode 100644
index 0000000..bbf2af2
--- /dev/null
+++ b/1sem/programming basics/z9/26.cpp	
@@ -0,0 +1,70 @@
+// pb_z9_26.cpp
+// Горбацевич Андрей
+#include <iostream>
+
+using namespace std;
+
+void sort(int arr[], int len, bool even_greater);
+void print_array(const int *arr, size_t len);
+int *get_array(size_t len);
+
+// 8 1 2 3 4 3 2 6 5 1
+int main() {
+    size_t len;
+    cout << "Array length >>>";
+    cin >> len;
+    cout << "Enter array elements >>>";
+    int *a = get_array(len);
+    bool even_greater;
+    cout << "Is even greater? (1/0) >>>";
+    cin >> even_greater;
+    cout << "Array before: ";
+    print_array(a, len);
+    sort(a, len, even_greater);
+    cout << "Array after: ";
+    print_array(a, len);
+}
+
+void sort(int arr[], int len, bool even_greater) {
+    bool swapped;
+    do {
+        swapped = false;
+        for (size_t i = 0; i < len - 1; i++) {
+            int cv = *(arr + i),
+                nv = *(arr + i + 1);
+            if (cv % 2 == nv % 2) {
+                if (cv > nv) {
+                    swap(*(arr + i), *(arr + i + 1));
+                    swapped = true;
+                }
+            }
+            if (even_greater) {
+                if (cv % 2 == 0 && nv % 2 != 0) {
+                    swap(*(arr + i), *(arr + i + 1));
+                    swapped = true;
+                }
+            }
+            else {
+                if (cv % 2 != 0 && nv % 2 == 0) {
+                    swap(*(arr + i), *(arr + i + 1));
+                    swapped = true;
+                }
+            }
+        }
+    } while (swapped);
+}
+
+void print_array(const int *arr, size_t len) {
+    for (size_t i = 0; i < len; i++) {
+        cout << *(arr + i) << " ";
+    }
+    cout << endl;
+}
+
+int *get_array(size_t len) {
+    int *a = new int[len];
+    for (size_t i = 0; i < len; i++) {
+        cin >> *(a + i);
+    }
+    return a;
+}
\ No newline at end of file
diff --git a/1sem/programming basics/z9/27.cpp b/1sem/programming basics/z9/27.cpp
new file mode 100644
index 0000000..3f4e120
--- /dev/null
+++ b/1sem/programming basics/z9/27.cpp	
@@ -0,0 +1,65 @@
+// pb_z9_27.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <cmath>
+
+using namespace std;
+
+void sort(double arr[], int len, double x);
+void print_array(const double *arr, size_t len);
+double *get_array(size_t len);
+
+// 8 1 2 3.5 4 3 2 2.9 1 2.5
+int main() {
+    size_t len;
+    cout << "Array length >>>";
+    cin >> len;
+    cout << "Enter array elements >>>";
+    double *a = get_array(len);
+    double x;
+    cout << "x >>>";
+    cin >> x;
+    cout << "Array before: ";
+    print_array(a, len);
+    sort(a, len, x);
+    cout << "Array after: ";
+    print_array(a, len);
+    auto *dist = new double[len];
+    for (size_t i = 0; i < len; i++) {
+        *(dist + i) = abs(*(a + i) - x);
+    }
+    cout << "Array dist: ";
+    print_array(dist, len);
+}
+
+void sort(double arr[], int len, double x) {
+    bool swapped;
+    do {
+        swapped = false;
+        for (size_t i = 0; i < len-1; i++) {
+            double cv = *(arr + i),
+                    nv = *(arr + i + 1),
+                    cvd = abs(cv - x),
+                    nvd = abs(nv - x);
+            if (cvd > nvd) {
+                swap(*(arr + i), *(arr + i + 1));
+                swapped = true;
+            }
+        }
+    } while (swapped);
+}
+
+void print_array(const double *arr, size_t len) {
+    for (size_t i = 0; i < len; i++) {
+        cout << *(arr + i) << " ";
+    }
+    cout << endl;
+}
+
+double *get_array(size_t len) {
+    auto *a = new double[len];
+    for (size_t i = 0; i < len; i++) {
+        cin >> *(a + i);
+    }
+    return a;
+}
\ No newline at end of file