Compilare: user.cpp: In function ‘std::pair<int, std::vector<int> > solve(std::vector<int>, bool)’: user.cpp:32:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<nodes.size();++i) ^ user.cpp:33:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1;j<nodes.size();++j){ ^ user.cpp:41:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<nodes.size();i++) ^ user.cpp:46:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<nodes.size();i++) ^ user.cpp:55:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<comps.size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:104:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<comps.size();i++){ ^ user.cpp:115:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<ans.second.size();i++) ^