diff --git a/1sem/adaptation courses/1/1.cpp b/1sem/adaptation courses/01/1.cpp
similarity index 100%
rename from 1sem/adaptation courses/1/1.cpp
rename to 1sem/adaptation courses/01/1.cpp
diff --git a/1sem/adaptation courses/1/2.cpp b/1sem/adaptation courses/01/2.cpp
similarity index 100%
rename from 1sem/adaptation courses/1/2.cpp
rename to 1sem/adaptation courses/01/2.cpp
diff --git a/1sem/adaptation courses/1/3.cpp b/1sem/adaptation courses/01/3.cpp
similarity index 100%
rename from 1sem/adaptation courses/1/3.cpp
rename to 1sem/adaptation courses/01/3.cpp
diff --git a/1sem/adaptation courses/1/4.cpp b/1sem/adaptation courses/01/4.cpp
similarity index 100%
rename from 1sem/adaptation courses/1/4.cpp
rename to 1sem/adaptation courses/01/4.cpp
diff --git a/1sem/adaptation courses/2/5.cpp b/1sem/adaptation courses/02/5.cpp
similarity index 100%
rename from 1sem/adaptation courses/2/5.cpp
rename to 1sem/adaptation courses/02/5.cpp
diff --git a/1sem/adaptation courses/2/6.cpp b/1sem/adaptation courses/02/6.cpp
similarity index 100%
rename from 1sem/adaptation courses/2/6.cpp
rename to 1sem/adaptation courses/02/6.cpp
diff --git a/1sem/adaptation courses/2/7.cpp b/1sem/adaptation courses/02/7.cpp
similarity index 100%
rename from 1sem/adaptation courses/2/7.cpp
rename to 1sem/adaptation courses/02/7.cpp
diff --git a/1sem/adaptation courses/3/10.cpp b/1sem/adaptation courses/03/10.cpp
similarity index 100%
rename from 1sem/adaptation courses/3/10.cpp
rename to 1sem/adaptation courses/03/10.cpp
diff --git a/1sem/adaptation courses/3/11.cpp b/1sem/adaptation courses/03/11.cpp
similarity index 100%
rename from 1sem/adaptation courses/3/11.cpp
rename to 1sem/adaptation courses/03/11.cpp
diff --git a/1sem/adaptation courses/3/9.cpp b/1sem/adaptation courses/03/9.cpp
similarity index 100%
rename from 1sem/adaptation courses/3/9.cpp
rename to 1sem/adaptation courses/03/9.cpp
diff --git a/1sem/adaptation courses/4/12.cpp b/1sem/adaptation courses/04/12.cpp
similarity index 100%
rename from 1sem/adaptation courses/4/12.cpp
rename to 1sem/adaptation courses/04/12.cpp
diff --git a/1sem/adaptation courses/4/13.cpp b/1sem/adaptation courses/04/13.cpp
similarity index 100%
rename from 1sem/adaptation courses/4/13.cpp
rename to 1sem/adaptation courses/04/13.cpp
diff --git a/1sem/adaptation courses/4/14.cpp b/1sem/adaptation courses/04/14.cpp
similarity index 100%
rename from 1sem/adaptation courses/4/14.cpp
rename to 1sem/adaptation courses/04/14.cpp
diff --git a/1sem/adaptation courses/5/15.cpp b/1sem/adaptation courses/05/15.cpp
similarity index 100%
rename from 1sem/adaptation courses/5/15.cpp
rename to 1sem/adaptation courses/05/15.cpp
diff --git a/1sem/adaptation courses/5/16.cpp b/1sem/adaptation courses/05/16.cpp
similarity index 100%
rename from 1sem/adaptation courses/5/16.cpp
rename to 1sem/adaptation courses/05/16.cpp
diff --git a/1sem/adaptation courses/5/17.cpp b/1sem/adaptation courses/05/17.cpp
similarity index 100%
rename from 1sem/adaptation courses/5/17.cpp
rename to 1sem/adaptation courses/05/17.cpp
diff --git a/1sem/adaptation courses/6/18.cpp b/1sem/adaptation courses/06/18.cpp
similarity index 100%
rename from 1sem/adaptation courses/6/18.cpp
rename to 1sem/adaptation courses/06/18.cpp
diff --git a/1sem/adaptation courses/6/19.cpp b/1sem/adaptation courses/06/19.cpp
similarity index 100%
rename from 1sem/adaptation courses/6/19.cpp
rename to 1sem/adaptation courses/06/19.cpp
diff --git a/1sem/adaptation courses/6/20.cpp b/1sem/adaptation courses/06/20.cpp
similarity index 100%
rename from 1sem/adaptation courses/6/20.cpp
rename to 1sem/adaptation courses/06/20.cpp
diff --git a/1sem/adaptation courses/7/21.cpp b/1sem/adaptation courses/07/21.cpp
similarity index 100%
rename from 1sem/adaptation courses/7/21.cpp
rename to 1sem/adaptation courses/07/21.cpp
diff --git a/1sem/adaptation courses/7/22.cpp b/1sem/adaptation courses/07/22.cpp
similarity index 100%
rename from 1sem/adaptation courses/7/22.cpp
rename to 1sem/adaptation courses/07/22.cpp
diff --git a/1sem/adaptation courses/7/23.cpp b/1sem/adaptation courses/07/23.cpp
similarity index 100%
rename from 1sem/adaptation courses/7/23.cpp
rename to 1sem/adaptation courses/07/23.cpp
diff --git a/1sem/adaptation courses/8/24.cpp b/1sem/adaptation courses/08/24.cpp
similarity index 100%
rename from 1sem/adaptation courses/8/24.cpp
rename to 1sem/adaptation courses/08/24.cpp
diff --git a/1sem/adaptation courses/8/25.cpp b/1sem/adaptation courses/08/25.cpp
similarity index 80%
rename from 1sem/adaptation courses/8/25.cpp
rename to 1sem/adaptation courses/08/25.cpp
index 5f432d5..261e652 100644
--- a/1sem/adaptation courses/8/25.cpp	
+++ b/1sem/adaptation courses/08/25.cpp	
@@ -3,11 +3,12 @@
 #include <iostream>
 #include <vector>
 #include <algorithm>
+#include <ctime>
 using namespace std;
 
 vector<int> max_diff(const vector<int> &vec) {
     vector<int> v = vec;
-    sort(begin(v), end(v));\
+    sort(begin(v), end(v));
     swap(*(v.end() - 1), v[1]);
     v.resize(2);
     return v;
@@ -19,13 +20,14 @@ int main() {
     cin >> N;
     vector<int> v;
     v.reserve(N);
-    cout << "v[...] >>>";
+    srand(time(0));
     for (int i = 0; i < N; i++) {
-        int j;
-        cin >> j;
+        int j = -5 + rand() % 10;
+        cout << j << " ";
         v.push_back(j);
     }
+    cout << endl;
     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/08/26.cpp
similarity index 100%
rename from 1sem/adaptation courses/8/26.cpp
rename to 1sem/adaptation courses/08/26.cpp
diff --git a/1sem/adaptation courses/9/27.cpp b/1sem/adaptation courses/09/27.cpp
similarity index 100%
rename from 1sem/adaptation courses/9/27.cpp
rename to 1sem/adaptation courses/09/27.cpp
diff --git a/1sem/adaptation courses/9/28.cpp b/1sem/adaptation courses/09/28.cpp
similarity index 100%
rename from 1sem/adaptation courses/9/28.cpp
rename to 1sem/adaptation courses/09/28.cpp
diff --git a/1sem/adaptation courses/9/29.cpp b/1sem/adaptation courses/09/29.cpp
similarity index 100%
rename from 1sem/adaptation courses/9/29.cpp
rename to 1sem/adaptation courses/09/29.cpp
diff --git a/1sem/programming basics/1/0.cpp b/1sem/programming basics/01/0.cpp
similarity index 100%
rename from 1sem/programming basics/1/0.cpp
rename to 1sem/programming basics/01/0.cpp
diff --git a/1sem/programming basics/2/0.cpp b/1sem/programming basics/02/0.cpp
similarity index 100%
rename from 1sem/programming basics/2/0.cpp
rename to 1sem/programming basics/02/0.cpp
diff --git a/1sem/programming basics/2/1.cpp b/1sem/programming basics/02/1.cpp
similarity index 100%
rename from 1sem/programming basics/2/1.cpp
rename to 1sem/programming basics/02/1.cpp
diff --git a/1sem/programming basics/2/2.cpp b/1sem/programming basics/02/2.cpp
similarity index 100%
rename from 1sem/programming basics/2/2.cpp
rename to 1sem/programming basics/02/2.cpp
diff --git a/1sem/programming basics/3/0.cpp b/1sem/programming basics/03/0.cpp
similarity index 100%
rename from 1sem/programming basics/3/0.cpp
rename to 1sem/programming basics/03/0.cpp
diff --git a/1sem/programming basics/3/1.cpp b/1sem/programming basics/03/1.cpp
similarity index 100%
rename from 1sem/programming basics/3/1.cpp
rename to 1sem/programming basics/03/1.cpp
diff --git a/1sem/programming basics/4/1_60.cpp b/1sem/programming basics/04/1_60.cpp
similarity index 100%
rename from 1sem/programming basics/4/1_60.cpp
rename to 1sem/programming basics/04/1_60.cpp
diff --git a/1sem/programming basics/4/2_40.cpp b/1sem/programming basics/04/2_40.cpp
similarity index 100%
rename from 1sem/programming basics/4/2_40.cpp
rename to 1sem/programming basics/04/2_40.cpp
diff --git a/1sem/programming basics/5/0_60.cpp b/1sem/programming basics/05/0_60.cpp
similarity index 100%
rename from 1sem/programming basics/5/0_60.cpp
rename to 1sem/programming basics/05/0_60.cpp
diff --git a/1sem/programming basics/5/1_40.cpp b/1sem/programming basics/05/1_40.cpp
similarity index 100%
rename from 1sem/programming basics/5/1_40.cpp
rename to 1sem/programming basics/05/1_40.cpp
diff --git a/1sem/programming basics/6/2_100.cpp b/1sem/programming basics/06/2_100.cpp
similarity index 100%
rename from 1sem/programming basics/6/2_100.cpp
rename to 1sem/programming basics/06/2_100.cpp
diff --git a/1sem/programming basics/7/2_100.cpp b/1sem/programming basics/07/2_100.cpp
similarity index 100%
rename from 1sem/programming basics/7/2_100.cpp
rename to 1sem/programming basics/07/2_100.cpp
diff --git a/1sem/programming basics/8/2_100.cpp b/1sem/programming basics/08/2_100.cpp
similarity index 100%
rename from 1sem/programming basics/8/2_100.cpp
rename to 1sem/programming basics/08/2_100.cpp
diff --git a/1sem/programming basics/9/100.cpp b/1sem/programming basics/09/100.cpp
similarity index 100%
rename from 1sem/programming basics/9/100.cpp
rename to 1sem/programming basics/09/100.cpp
diff --git a/1sem/programming basics/z1/1.cpp b/1sem/programming basics/z01/1.cpp
similarity index 100%
rename from 1sem/programming basics/z1/1.cpp
rename to 1sem/programming basics/z01/1.cpp
diff --git a/1sem/programming basics/z1/2.cpp b/1sem/programming basics/z01/2.cpp
similarity index 100%
rename from 1sem/programming basics/z1/2.cpp
rename to 1sem/programming basics/z01/2.cpp
diff --git a/1sem/programming basics/z1/3.cpp b/1sem/programming basics/z01/3.cpp
similarity index 100%
rename from 1sem/programming basics/z1/3.cpp
rename to 1sem/programming basics/z01/3.cpp
diff --git a/1sem/programming basics/z2/4.cpp b/1sem/programming basics/z02/4.cpp
similarity index 100%
rename from 1sem/programming basics/z2/4.cpp
rename to 1sem/programming basics/z02/4.cpp
diff --git a/1sem/programming basics/z2/5.cpp b/1sem/programming basics/z02/5.cpp
similarity index 100%
rename from 1sem/programming basics/z2/5.cpp
rename to 1sem/programming basics/z02/5.cpp
diff --git a/1sem/programming basics/z2/6.cpp b/1sem/programming basics/z02/6.cpp
similarity index 100%
rename from 1sem/programming basics/z2/6.cpp
rename to 1sem/programming basics/z02/6.cpp
diff --git a/1sem/programming basics/z3/7.cpp b/1sem/programming basics/z03/7.cpp
similarity index 100%
rename from 1sem/programming basics/z3/7.cpp
rename to 1sem/programming basics/z03/7.cpp
diff --git a/1sem/programming basics/z3/8.cpp b/1sem/programming basics/z03/8.cpp
similarity index 100%
rename from 1sem/programming basics/z3/8.cpp
rename to 1sem/programming basics/z03/8.cpp
diff --git a/1sem/programming basics/z3/9.cpp b/1sem/programming basics/z03/9.cpp
similarity index 100%
rename from 1sem/programming basics/z3/9.cpp
rename to 1sem/programming basics/z03/9.cpp
diff --git a/1sem/programming basics/z4/10.cpp b/1sem/programming basics/z04/10.cpp
similarity index 100%
rename from 1sem/programming basics/z4/10.cpp
rename to 1sem/programming basics/z04/10.cpp
diff --git a/1sem/programming basics/z4/11.cpp b/1sem/programming basics/z04/11.cpp
similarity index 100%
rename from 1sem/programming basics/z4/11.cpp
rename to 1sem/programming basics/z04/11.cpp
diff --git a/1sem/programming basics/z4/12.cpp b/1sem/programming basics/z04/12.cpp
similarity index 100%
rename from 1sem/programming basics/z4/12.cpp
rename to 1sem/programming basics/z04/12.cpp
diff --git a/1sem/programming basics/z5/13.cpp b/1sem/programming basics/z05/13.cpp
similarity index 100%
rename from 1sem/programming basics/z5/13.cpp
rename to 1sem/programming basics/z05/13.cpp
diff --git a/1sem/programming basics/z5/14.cpp b/1sem/programming basics/z05/14.cpp
similarity index 100%
rename from 1sem/programming basics/z5/14.cpp
rename to 1sem/programming basics/z05/14.cpp
diff --git a/1sem/programming basics/z5/15.cpp b/1sem/programming basics/z05/15.cpp
similarity index 100%
rename from 1sem/programming basics/z5/15.cpp
rename to 1sem/programming basics/z05/15.cpp
diff --git a/1sem/programming basics/z6/16.cpp b/1sem/programming basics/z06/16.cpp
similarity index 100%
rename from 1sem/programming basics/z6/16.cpp
rename to 1sem/programming basics/z06/16.cpp
diff --git a/1sem/programming basics/z6/17.cpp b/1sem/programming basics/z06/17.cpp
similarity index 100%
rename from 1sem/programming basics/z6/17.cpp
rename to 1sem/programming basics/z06/17.cpp
diff --git a/1sem/programming basics/z6/18.cpp b/1sem/programming basics/z06/18.cpp
similarity index 100%
rename from 1sem/programming basics/z6/18.cpp
rename to 1sem/programming basics/z06/18.cpp
diff --git a/1sem/programming basics/z7/19.cpp b/1sem/programming basics/z07/19.cpp
similarity index 100%
rename from 1sem/programming basics/z7/19.cpp
rename to 1sem/programming basics/z07/19.cpp
diff --git a/1sem/programming basics/z7/20.cpp b/1sem/programming basics/z07/20.cpp
similarity index 100%
rename from 1sem/programming basics/z7/20.cpp
rename to 1sem/programming basics/z07/20.cpp
diff --git a/1sem/programming basics/z7/21.cpp b/1sem/programming basics/z07/21.cpp
similarity index 100%
rename from 1sem/programming basics/z7/21.cpp
rename to 1sem/programming basics/z07/21.cpp
diff --git a/1sem/programming basics/z8/22.cpp b/1sem/programming basics/z08/22.cpp
similarity index 100%
rename from 1sem/programming basics/z8/22.cpp
rename to 1sem/programming basics/z08/22.cpp
diff --git a/1sem/programming basics/z8/23.cpp b/1sem/programming basics/z08/23.cpp
similarity index 100%
rename from 1sem/programming basics/z8/23.cpp
rename to 1sem/programming basics/z08/23.cpp
diff --git a/1sem/programming basics/z8/24.cpp b/1sem/programming basics/z08/24.cpp
similarity index 100%
rename from 1sem/programming basics/z8/24.cpp
rename to 1sem/programming basics/z08/24.cpp
diff --git a/1sem/programming basics/z9/25.cpp b/1sem/programming basics/z09/25.cpp
similarity index 100%
rename from 1sem/programming basics/z9/25.cpp
rename to 1sem/programming basics/z09/25.cpp
diff --git a/1sem/programming basics/z9/26.cpp b/1sem/programming basics/z09/26.cpp
similarity index 100%
rename from 1sem/programming basics/z9/26.cpp
rename to 1sem/programming basics/z09/26.cpp
diff --git a/1sem/programming basics/z9/27.cpp b/1sem/programming basics/z09/27.cpp
similarity index 100%
rename from 1sem/programming basics/z9/27.cpp
rename to 1sem/programming basics/z09/27.cpp