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  1. #include <iostream>
  2. using namespace std;
  3. int main()
  4. {
  5.     int n , one = 0 , two = 0 , three = 0 , four = 0 , ans = 0 ;
  6.     cin>>n ;
  7.     for(int i=1 ; i<=n ; i++)
  8.     {
  9.         int x ;
  10.         cin>>x ;
  11.         if(x==1)
  12.             one++;
  13.         else if(x ==2)
  14.             two++;
  15.         else if(x ==3)
  16.             three++;
  17.         else if(x ==4)
  18.             four++;
  19.     }
  20.     ans += four ;
  21.     ans += (two / 2) ;
  22.     int mn = min(one , three) ;
  23.     ans += mn ;
  24.     one -= mn ;
  25.     three -= mn ;
  26.     ans += three ;
  27.     int rem = two % 2 ;
  28.     if(rem == 1)
  29.         ans+= (one + 2 + 3) / 4 ;
  30.     else
  31.         ans+= (one + 3) /4 ;
  32.     cout<<ans;
  33.     return 0;
  34. }
Success #stdin #stdout 0.01s 5444KB
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https://ideone.com/MktJf0
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
public

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