Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:16:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[nod].size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:48:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < CC.size(); i++) printf("%d ", CC[i]); ^ user.cpp:54:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < Art_P.size(); ++i) ^ user.cpp:58:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < Art_P.size(); ++i) printf("%d ", Art_P[i]); ^ user.cpp:33:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("pamant.in", "r", stdin); ^ user.cpp:34:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pamant.out", "w", stdout); ^ user.cpp:35:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:37:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^