Compilare: main.cpp: In function 'void go_visit(int)': main.cpp:15:18: 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:43:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<nod[i].size();j++) ~^~~~~~~~~~~~~~ main.cpp:53:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<nod[i].size();j++) ~^~~~~~~~~~~~~~ main.cpp:60:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<elem[root].size();i++) ~^~~~~~~~~~~~~~~~~~ main.cpp:65:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ans.size();i++) ~^~~~~~~~~~~