Compilare: user.cpp: In function ‘void Tarjan(int)’: user.cpp:37:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:65:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<retele.size(); ++i) ^ user.cpp:68:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<retele[i].size(); ++j) ^