Compilare: main.cpp: In function 'int BFS()': main.cpp:21:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[q.front()].size();i++) ~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:51:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[n].size();i++) ~^~~~~~~~~~~~ main.cpp:37:36: 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); ^ main.cpp:38:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.out","w",stdout); ^ main.cpp:39:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:43:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&a,&b,&cc); ^