Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:18:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[nod].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:61:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<cbc[i].size(); j++) ^