Compilare: user.cpp: In function ‘void afis(int, std::vector<std::pair<int, int> >)’: user.cpp:37:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < APCM.size(); i++) g << APCM[i].first << " " << APCM[i].second << '\n'; ^ user.cpp: In function ‘int main()’: user.cpp:65:15: warning: unused variable ‘i’ [-Wunused-variable] int n, m, i; ^