Compilare: user.cpp: In function ‘void Tarjan(int)’: user.cpp:22:42: 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:49:37: 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:93:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < scc[i].size(); j++) ^ user.cpp:111:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < new_graph[i].size(); j++) ^ user.cpp:97:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plan.in", "r", stdin); ^ user.cpp:99:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:102:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &t1, &t2); ^