继续(3n+1)猜想 (25)

 #include <algorithm>
 #include <iostream>
 using namespace std;

 int main(){
     int hash[] = {  };
     int x, n, a[], num = ;
     cin >> x;
     for (int i = ; i<x; i++){
         cin >> a[i];
         n = a[i];
         if (hash[n] == )
             continue;
         while (n>){
             if (n %  == )
                 n /= ;
             else n = ( * n + ) / ;
             hash[n] = ;
         }
     }
     sort(a, a + x);
     for (int i = x - ; i >= ; i--){
         if (hash[a[i]] == ){
             num++;
             if (num>) cout << " ";
             cout << a[i];
         }
     }
     return ;
 }