Compilare: user.cpp: In function ‘void Tarjan(int)’: user.cpp:23:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < my_nodes[t].size(); i ++) ^ user.cpp: In function ‘int exist(std::vector<int>*, int, int)’: user.cpp:50:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < vec[x].size(); i ++) ^ user.cpp: In function ‘int main()’: user.cpp:90:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < scc[i].size(); j++) ^ user.cpp:108:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < new_graph[i].size(); j++) ^