Compilare: user.cpp: In function ‘void phi_ham()’: user.cpp:40:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v.size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:61:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cntgcd.in","r",stdin); ^ user.cpp:62:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cntgcd.out","w",stdout); ^