Compilare: user.cpp: In function ‘void Tarjan(int)’: user.cpp:29:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < graph[nod].size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:72:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < sol.size(); ++i) { ^ user.cpp:74:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < sol[i].size(); ++j) ^