Compilare: user.cpp: In function ‘void DFS(int, int)’: user.cpp:18:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Good[Node].size(); ++ i) ^ user.cpp: In function ‘int main()’: user.cpp:49:32: warning: suggest parentheses around assignment used as truth value [-Wparentheses] Level[j] = Used[j] = CntGood[j] = 0; ^ user.cpp:56:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < Bad[j].size(); ++ k) ^ user.cpp:65:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Ans.size(); ++ i) ^ user.cpp:25:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("treespotting.in", "r", stdin); ^ user.cpp:26:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("treespotting.out", "w", stdout); ^ user.cpp:28:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &N, &M); ^ user.cpp:31:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &X, &Y); ^ user.cpp:38:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &X, &Y); ^