Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:26:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<List[node].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:43:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(short j=0;j<V.size();j++) ^ user.cpp:57:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(short i=0;i<V.size();i++) ^ user.cpp:58:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(short j=i+1;j<V.size();j++) ^ user.cpp:69:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V.size();i++) ^ user.cpp:32:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colaj.in","r",stdin); ^ user.cpp:33:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colaj.out","w",stdout); ^ user.cpp:34:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&K,&M,&N); ^ user.cpp:38:100: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd%hd%hd%hd",&Rect.first.second,&Rect.first.first,&Rect.second.second,&Rect.second.first); ^