func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long nInf = -1000000000;   const long long pInf = 1000000000;   const long long mod = 1000000007;   const int MAXN = 3010;   void getdata();   void preproc();   void solve();   vector<int> g[MAXN];   bool gr[MAXN][MAXN];   int n, m;   int main() {     int t = 1;     for (int i = 0; i < t; i++) {       getdata();       preproc();       solve();     }     return 0;   }   void getdata() {     scanf( %d %d , &n, &m);     for (int i = 0; i < m; i++) {       int x, y;       scanf( %d %d , &x, &y);       x--;       y--;       g[x].push_back(y);       gr[x][y] = true;     }   }   void preproc() {}   void solve() {     long long res = 0;     for (int a = 0; a < n; a++) {       for (int c = 0; c < n; c++) {         if (a == c) continue;         int count = 0;         for (int i = 0; i < (int)g[a].size(); i++) {           int b = g[a][i];           if (gr[b][c]) {             count++;           }         }         res += count * (count - 1) / 2;       }     }     printf( %I64d n , res);   }   