Compilare: user.cpp: In function ‘void fix(int)’: user.cpp:22:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sons[nod].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:87:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < rad.size(); i++) ^ user.cpp:93:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < rad.size(); i++) ^ user.cpp:96:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(mch.size() != N - 1) ^ user.cpp:36:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("revolve.in", "r", stdin); ^ user.cpp:37:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("revolve.out", "w", stdout); ^ user.cpp:39:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &T); ^ user.cpp:42:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &N); ^ user.cpp:53:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &M); ^ user.cpp:57:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ user.cpp:58:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &y); ^ user.cpp:59:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &z); ^