Compilare: user.cpp: In function ‘void df1(int)’: user.cpp:25:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<g[x].size();i++) ^ user.cpp: In function ‘void df2(int)’: user.cpp:35:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<gr[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:61:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<C.size();j++) Cs[cp].push_back(C[j]); ^ user.cpp:70:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<Cs[a[i].s].size();j++) cout<<Cs[a[i].s][j]<<" "; ^