Compilare: user.cpp: In function ‘void Tarjan(int)’: user.cpp:24:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < noduri[t].size(); i ++) ^ user.cpp: In function ‘int validare(std::vector<int>*, int, int)’: user.cpp:51:37: 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:92:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < scc[i].size(); j++) ^ user.cpp:110:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < new_graph[i].size(); j++) ^ user.cpp:96:33: 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:98:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:101:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^