Compilare: user.cpp: In function ‘bool verify(int, int)’: user.cpp:14:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cmmdc(a,b)==p)return true; ^ user.cpp: In function ‘int main()’: user.cpp:30:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<k;i++)total+=v[i].size()*(v[i].size()+1)/2; ^ user.cpp: In function ‘int cmmdc(int, int)’: user.cpp:11:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:19:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("aiacucmmdc.in","r",stdin); ^ user.cpp:20:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("aiacucmmdc.out","w",stdout); ^