func_code_string: #include <bits/stdc++.h>   #pragma GCC optimize( O3 )   const double PI = acos(-1.0);   using namespace std;   const int N = 509, M = 1000000;   int n, m, dis[N][N], in[N][N], ans[N][N], t[N][N];   vector<int> adj[N];   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     ;     cin >> n >> m;     int u, v, d;     memset(dis,  ? , sizeof dis);     for (int i = 1; i <= m; i++) {       cin >> u >> v >> d;       adj[u].push_back(v);       adj[v].push_back(u);       dis[u][v] = dis[v][u] = d;       t[u][v] = t[v][u] = d;     }     for (int i = 1; i <= n; i++) dis[i][i] = 0;     for (int k = 1; k <= n; k++)       for (int i = 1; i <= n; i++)         for (int j = 1; j <= n; j++)           dis[i][j] = min(dis[i][j], dis[i][k] + dis[k][j]);     for (int i = 1; i <= n; i++) {       for (int j = 1; j <= n; j++) {         if (i == j) continue;         for (auto k : adj[j]) {           if (dis[i][k] + t[k][j] == dis[i][j]) in[i][j]++;         }       }     }     for (int i = 1; i <= n; i++) {       for (int j = 1; j <= n; j++) {         for (int k = 1; k <= n; k++) {           if (dis[i][k] + dis[k][j] == dis[i][j]) ans[i][j] += in[i][k];         }       }     }     for (int i = 1; i <= n; i++)       for (int j = i + 1; j <= n; j++) {         if (dis[i][j] >= dis[502][502])           cout <<  0  ;         else           cout << ans[i][j] <<    ;       }     return 0;   }   