func_code_string: #include <bits/stdc++.h>   using namespace std;   int gcd(int a, int b) {     int c;     while (a != 0) {       c = a;       a = b % a;       b = c;     }     return b;   }   int main() {     ios_base::sync_with_stdio(0);     int n, m, b = 0;     cin >> n >> m;     vector<vector<int> > arr(n, vector<int>(4, 0));     for (int i = 0; i < n; i++) {       if (b < m) {         b++;         arr[i][0] = b;       }       if (b < m) {         b++;         arr[i][3] = b;       }     }     for (int i = 0; i < n; i++) {       if (b < m) {         b++;         arr[i][1] = b;       }       if (b < m) {         b++;         arr[i][2] = b;       }     }     for (int i = 0; i < n; i++) {       if (arr[i][1] != 0) cout << arr[i][1] <<    ;       if (arr[i][0] != 0) cout << arr[i][0] <<    ;       if (arr[i][2] != 0) cout << arr[i][2] <<    ;       if (arr[i][3] != 0) cout << arr[i][3] <<    ;     }     return 0;   }   