Compilare: user.cpp: In function ‘int main()’: user.cpp:13:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define rep(i, begin, end) for (int i = (begin); i < (end); i++) ^ user.cpp:52:5: note: in expansion of macro ‘rep’ rep(i,0,vec.size()) { ^ user.cpp:45:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evantai.in","r",stdin); ^ user.cpp:46:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("evantai.out","w",stdout); ^