Compilare: user.cpp: In function ‘void solve(std::multiset<int>)’: user.cpp:33:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ans>A.size()/2) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:54:9: warning: unused variable ‘sons’ [-Wunused-variable] int sons=0; ^ user.cpp: In function ‘int main()’: user.cpp:80:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("egal.in","r",stdin); ^ user.cpp:81:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("egal.out","w",stdout); ^ user.cpp:83:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:87:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&X,&Y); ^ user.cpp:100:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&cheie); ^