Compilare: user.cpp: In function ‘int main()’: user.cpp:69:21: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(vis[1][x]&&vis[2][y] || vis[2][x]&&vis[1][y]) ^ user.cpp:44:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("critice.in","r",stdin); ^ user.cpp:45:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("critice.out","w",stdout); ^ user.cpp:46:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:53:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] edge.push_back(make_pair(x,y)); ^