func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m, s, e, t, r;     cin >> n >> m;     vector<pair<int, int> > sections(n + 1);     for (int i = 1; i <= n; i++) sections[i].first = 0x3f3f3f3f;     while (m--) {       cin >> s >> e >> t >> r;       for (int i = s; i <= e; i++) {         if (t < sections[i].first) {           sections[i].first = t;           sections[i].second = r;         }       }     }     int ans = 0;     for (int i = 1; i <= n; i++) {       ans += sections[i].second;     }     cout << ans;   }   