Compilare: user.cpp: In function ‘void BFS()’: user.cpp:32:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<LA[u].size(); i++) ^ user.cpp: In function ‘void read()’: user.cpp:16:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &N, &M, &x); int a,b; ^ user.cpp:19:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^ user.cpp:22:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1; i<=x; i++) scanf("%d", &X[i]); ^ user.cpp: In function ‘int main()’: user.cpp:53:24: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(inf,"r",stdin); freopen(outf,"w",stdout); ^ user.cpp:53:50: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(inf,"r",stdin); freopen(outf,"w",stdout); ^