func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m;     cin >> n >> m;     vector<int> balance(n, 0);     for (int i = 0; i < m; i++) {       int a, b, c;       cin >> a >> b >> c;       balance[a - 1] -= c;       balance[b - 1] += c;     }     int total = 0;     for (int i = 0; i < n; i++) {       total += balance[i] > 0 ? balance[i] : 0;     }     cout << total << endl;     return 0;   }   