func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m, flow[200100][2], dtion[200100], Eg[200100];   bool vis[200100];   queue<int> q;   struct node {     int v, d, i;     node *next;   } edge[200100 * 2];   node *cnt = &edge[0];   node *adj[200100];   void Addedge(int u, int v, int d, int i) {     node *p = ++cnt;     p->v = v;     p->d = d;     p->i = i;     p->next = adj[u];     adj[u] = p;   }   void Solve() {     int u, v, d;     scanf( %d%d , &n, &m);     for (int i = 1; i <= m; i++) {       scanf( %d%d%d , &Eg[i], &v, &d);       Addedge(Eg[i], v, d, i);       flow[Eg[i]][0] += d;       Addedge(v, Eg[i], d, i);       flow[v][0] += d;     }     q.push(1);     vis[1] = true;     while (!q.empty()) {       u = q.front();       q.pop();       for (node *p = adj[u]; p; p = p->next) {         v = p->v;         d = p->d;         if (vis[v]) continue;         dtion[p->i] = u;         flow[v][1] += d;         flow[v][0] -= d;         if (v != n && flow[v][1] == flow[v][0]) {           vis[v] = true;           q.push(v);         }       }     }     for (int i = 1; i <= m; i++) {       if (dtion[i] == Eg[i])         printf( 0 n );       else         printf( 1 n );     }   }   int main() {     Solve();     return 0;   }   