Compilare: user.cpp: In function ‘void BFs(int, int, int (&)[7510])’: user.cpp:29:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<graph[head].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:45:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(inFile,"r",stdin); ^ user.cpp:46:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(outFile,"w",stdout); ^ user.cpp:48:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&m,&x,&y); ^ user.cpp:52:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^