Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:12:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<vecin[x].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:36:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<c[u[i]].size(); j++) ^