Compilare: main.cpp: In function 'void dfs(int)': main.cpp:21:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<nod[x].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:54:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] { for(int j=0; j<ctc[i].size(); j++) g << ctc[i][j] << ' '; ~^~~~~~~~~~~~~~