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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int v[1005];
  5.  
  6. int main () {
  7.   ios :: sync_with_stdio(0);
  8.   int n, k;
  9.   cin >> n >> k;
  10.   int ans = 0;
  11.   for(int i = 1; i <= n; i++) {
  12.     int a;
  13.     cin >> a;
  14.     v[a] += 1;
  15.   }
  16.   int x;
  17.   n % 2 ? x = (n / 2) + 1 : x = n / 2;
  18.   for(int i = 1; i <= k && x > 0; i++) {
  19.     ans += min(v[i] / 2, x) * 2;
  20.     x -= min(v[i] / 2, x);
  21.     v[i] % 2 ? v[i] = 1 : v[i] = 0;
  22.   }
  23.   if(x) {
  24.     for(int i = 1; i <= k && x > 0; i++) {
  25.       if(v[i]) {
  26.         x--;
  27.         ans++;
  28.       }
  29.     }
  30.   }
  31.   cout << ans;
  32.  
  33.   return 0;
  34. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/Rh6SW5
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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