func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long INF = 9223372036854775807ll;   const long long dx[] = {1, -1, 0, 0}, dy[] = {0, 0, 1, -1}, inf = 2147483647,                   nmax = 300005;   struct trip {     long long a, b, c;   };   long long n, m, s[nmax];   vector<pair<long long, long long> > neg, poz;   vector<trip> sol;   signed main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     cin >> n >> m;     for (long long i = 1; i <= m; ++i) {       long long x, y, w;       cin >> x >> y >> w;       s[x] -= w;       s[y] += w;     }     for (long long i = 1; i <= n; ++i) {       if (s[i] > 0) poz.push_back({i, s[i]});       if (s[i] < 0) neg.push_back({i, -s[i]});     }     while (poz.size() && neg.size()) {       long long x = min(poz.back().second, neg.back().second);       long long a = neg.back().first, b = poz.back().first;       sol.push_back({a, b, x});       poz.back().second -= x;       neg.back().second -= x;       if (poz.back().second == 0) poz.pop_back();       if (neg.back().second == 0) neg.pop_back();     }     cout << sol.size() <<   n ;     for (auto x : sol) cout << x.a <<     << x.b <<     << x.c <<   n ;     return 0;   }   