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:68:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i1=0;i1<elem[where][i].size();i1++) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:69:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j1=0;j1<elem[where][j].size();j1++) ~~^~~~~~~~~~~~~~~~~~~~~~