func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m;     int l, r, t, c;     int res = 0;     cin >> n >> m;     n++;     int a[n];     int b[n];     for (int i = 0; i < n; i++) {       a[i] = 10000;       b[i] = 0;     }     while (m--) {       cin >> l >> r >> t >> c;       for (int i = l; i <= r; i++) {         if (a[i] > t) {           a[i] = t;           b[i] = c;         }       }     }     for (int i = 0; i < n; i++) {       res += b[i];     }     cout << res << endl;     return 0;   }   