Compilare: user.cpp: In function ‘int main()’: user.cpp:141:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<Lx[i].size();++j) ^ user.cpp:144:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j<Lx[i].size()-1) yup[Lx[i][j].y]=Lx[i][j+1].x; ^ user.cpp:146:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<Ly[i].size();++j) ^ user.cpp:149:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j<Lx[i].size()-1) xdr[Ly[i][j].y]=Ly[i][j+1].x; ^