func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int n, m;     cin >> n >> m;     vector<int> debt(n + 1, 0);     for (int i = 0; i < m; i++) {       int poor, rich, amt;       cin >> poor >> rich >> amt;       debt[poor] -= amt;       debt[rich] += amt;     }     int ans = 0;     for (int &it : debt) {       if (it < 0) {         ans += -it;       }     }     cout << ans <<   n ;     return 0;   }   