Compilare: user.cpp: In function ‘int main()’: user.cpp:26:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int it=0;it<H[c.t%MOD].size(); it++) ^ user.cpp:35:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int it=0;it<H[i].size();it++) g<<H[i][it].t<<' '<<H[i][it].s<<' '; ^