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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define int long long
  5. int n;
  6. int cnt[5];
  7.  
  8. main()
  9. {
  10.     ios::sync_with_stdio(0);
  11.     cin.tie(0);
  12.     cin >> n;
  13.     for(int i = 1 ; i <= n ; i++)
  14.     {
  15.         int x;
  16.         cin >> x;
  17.         cnt[x]++;
  18.     }
  19.     int ans = cnt[4];
  20.     int x = min(cnt[1] , cnt[3]);
  21.     ans += x;
  22.     cnt[1] -= x;
  23.     cnt[3] -= x;
  24.  
  25.     if(cnt[3] > 0)
  26.         ans += (cnt[3] + (cnt[2] + 1) / 2);
  27.     else
  28.     {
  29.         int nguoi = cnt[1] + 2 * cnt[2];
  30.         ans += (nguoi + 3) / 4;
  31.     }
  32.     cout << ans;
  33. }
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/io5zqQ
language:
C++14 (gcc 8.3)
created:
24 days ago
visibility:
public

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