Compilare: user.cpp: In function ‘bool bfs()’: user.cpp:26:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<V[now].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:53:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<V[n].size();i++) ^ user.cpp:40:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.in","r",stdin); ^ user.cpp:41:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:45:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&c); ^