[3sem] dsaa07 done and report

3sem/data structures and algos/07/program.cpp

@@ -0,0 +1,114 @@
+// dsaa_07.cpp
+// Горбацевич Андрей
+#include <iostream>
+#include <chrono>
+#include <valarray>
+
+
+inline void time_passed(std::chrono::high_resolution_clock::time_point start, double& holder) {
+    auto stop = std::chrono::high_resolution_clock::now();
+    auto duration = std::chrono::duration_cast<std::chrono::microseconds>(stop - start);
+    holder = duration.count();
+}
+
+class matrix {
+private:
+    int _rows = 0;
+    int _cols = 0;
+    std::valarray<int> data;
+
+public:
+    matrix()  = default;
+    matrix(int32_t rows, int32_t cols) : _rows(rows), _cols(cols), data(rows*cols) {}
+
+    int& operator()(int i, int j) {
+        return this->data[i * this->_cols + j];
+    }
+
+    int operator()(int i, int j) const {
+        return this->data[i * this->_cols + j];
+    }
+
+    [[nodiscard]] int cols() const {
+        return this->_cols;
+    }
+
+    [[nodiscard]] int rows() const {
+        return this->_rows;
+    }
+};
+
+class levenstein{
+private:
+    std::string ls;
+    std::string rs;
+
+    matrix D;
+
+public:
+    levenstein(const std::string &ls, const std::string &rs) {
+        this->ls = ls;
+        this->rs = rs;
+        this->D = matrix(ls.length() + 1, rs.length() + 1);
+
+        D(0, 0) = 0;
+        for (int j = 1; j <= D.cols(); j++) {
+            D(0, j) = D(0, j - 1) + 1;
+        }
+        for (int i = 1; i <= D.rows(); i++) {
+            D(i, 0) = D(i - 1, 0) + 1;
+            for (int j = 1; j <= D.cols(); j++) {
+                D(i, j) = std::min({
+                    D(i - 1, j) + 1,
+                    D(i, j - 1) + 1,
+                    D(i - 1, j - 1) + (ls[i] == rs[j]? 0 : 2)
+                });
+            }
+        }
+    }
+
+    int distance() {
+        return this->D(ls.length(), rs.length());
+    }
+
+    void print() {
+        printf("\t\t");
+        for (int j = 0; j < D.cols(); j++) {
+            printf("%c\t", rs[j]);
+        }
+        printf("\n");
+
+        for (int i = 0; i < D.rows(); i++) {
+            for (int j = 0; j < D.cols(); j++) {
+                if (j == 0) {
+                    if (i > 0) {
+                        printf("%c\t", ls[i - 1]);
+                    }
+                    else {
+                        printf("\t");
+                    }
+                }
+                printf("%d\t", D(i, j));
+            }
+            printf("\n");
+        }
+
+        printf("\n");
+    }
+};
+
+int main() {
+    std::string f_word, s_word;
+    std::cout << "Enter two words, separated by space symbol:\n";
+    std::cin >> f_word >> s_word;
+
+    double ellapsed_time = 0;
+    auto start = std::chrono::high_resolution_clock::now();
+    auto l = levenstein(f_word, s_word);
+    time_passed(start, ellapsed_time);
+
+    l.print();
+    std::cout << l.distance() << " action(s) need to be done, found in " << 0 << " microseconds\n";
+
+    return 0;
+}