Compilare: user.cpp: In function ‘int main()’: user.cpp:210:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<V.size();++i) ^ user.cpp:231:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<V.size();++i) ^ user.cpp:181:27: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("eq.in","r",stdin); ^ user.cpp:182:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("eq.out","w",stdout); ^ user.cpp:184:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&N,&Q); ^ user.cpp:187:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&A[i]); ^ user.cpp:196:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&left,&right); ^