Compilare: user.cpp: In function ‘void tarjan(int, int)’: user.cpp:21:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < G[x].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:74:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0;j < rez[i].size();++j) ^