继续(3n+1)猜想 (25)

 1 #include <algorithm>
 2 #include <iostream>
 3 using namespace std;
 4 
 5 int main(){
 6     int hash[10000] = { 0 };
 7     int x, n, a[110], num = 0;
 8     cin >> x;
 9     for (int i = 0; i<x; i++){
10         cin >> a[i];
11         n = a[i];
12         if (hash[n] == 1)
13             continue;
14         while (n>1){
15             if (n % 2 == 0)
16                 n /= 2;
17             else n = (3 * n + 1) / 2;
18             hash[n] = 1;
19         }
20     }
21     sort(a, a + x);
22     for (int i = x - 1; i >= 0; i--){
23         if (hash[a[i]] == 0){
24             num++;
25             if (num>1) cout << " ";
26             cout << a[i];
27         }
28     }
29     return 0;
30 }