Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:43:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:90:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < C[i].size(); j++) ^