Compilare: main.cpp: In function 'void go_visit(int)': main.cpp:18:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nod[pos].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:53:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ans.size();i++) ~^~~~~~~~~~~ main.cpp:56:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<ans[i].size();j++)fout<<ans[i][j]<<" "; ~^~~~~~~~~~~~~~