Compilare: main.cpp: In function 'int main()': main.cpp:35:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<lines[i].size()-1; ++j){ ~^~~~~~~~~~~~~~~~~~ main.cpp:36:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=j+1; k<lines[i].size(); ++k) if(1.0*(list[lines[i][j]].r+list[lines[i][k]].r)>=dist(list[lines[i][j]], list[lines[i][k]])) { ~^~~~~~~~~~~~~~~~