Compilare: user.cpp: In function ‘void solve()’: user.cpp:34:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<X.size();i++) ^ user.cpp:35:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<T[X[i]].size();j++) ^ user.cpp:44:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<X.size();i++) X[i]=i+1; ^ user.cpp:27:26: warning: variable ‘s’ set but not used [-Wunused-but-set-variable] int i,bs=0,c=0,j,k=2,s; ^ user.cpp: In function ‘void read()’: user.cpp:14:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp:18:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^ user.cpp: In function ‘int main()’: user.cpp:57:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rmvc.in","r",stdin); ^ user.cpp:58:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rmvc.out","w",stdout); ^