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  1. #include<bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. #define ll long long
  6. #define ld long double
  7. #define vll vector<ll>
  8. #define pb push_back
  9. #define f first
  10. #define se second
  11. #define endl '\n'
  12. #define Left Node << 1
  13. #define Right Node << 1 | 1
  14. #define INF -1e9
  15. #define Fast() {ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);}
  16.  
  17. void solve()
  18. {
  19.     int n;
  20.     cin >> n;
  21.  
  22.     vector<int> a(n);
  23.     for (int &it : a)
  24.         cin >> it;
  25.  
  26.     sort(a.begin(), a.end());
  27.  
  28.     int ans = 1;
  29.     for (int i = 0; i < n; i++) {
  30.         int pos = upper_bound(a.begin(), a.end(), a[i] + 5) - a.begin();
  31.  
  32.         ans = max(ans, pos - i);
  33.     }
  34.  
  35.     cout << ans << endl;
  36. }
  37.  
  38. int main()
  39. {
  40.     Fast();
  41.  
  42.     int t = 1;
  43.     // cin >> t;
  44.     while (t--)
  45.     {
  46.         solve();
  47.     }
  48.  
  49.     return 0;
  50. }
Success #stdin #stdout 0.01s 5312KB
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https://ideone.com/j4rUn7
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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