Compilare: main.cpp: In function 'void put(int)': main.cpp:12:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v[i].size(); j++) w[v[i][j]]=2; ~^~~~~~~~~~~~ main.cpp:46:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v[i].size(); j++) put(v[i][j]); ~^~~~~~~~~~~~