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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. #define ll long long
  6.  
  7. // Should be Accepted (Fast-I/O)
  8.  
  9. #define EGRY                          \
  10.     ios_base::sync_with_stdio(false); \
  11.     cin.tie(NULL);
  12.  
  13. const int MAX = 1e6 + 5;
  14.  
  15. void solve()
  16. {
  17.     ll n, k;
  18.     cin >> n >> k;
  19.  
  20.     vector<ll> a(n), b(n);
  21.  
  22.     set<ll> prices;
  23.  
  24.     for (ll i = 0; i < n; i++)
  25.     {
  26.         cin >> a[i];
  27.         prices.insert(a[i]);
  28.     }
  29.  
  30.     for (ll i = 0; i < n; i++)
  31.     {
  32.         cin >> b[i];
  33.         prices.insert(b[i]);
  34.     }
  35.  
  36.     sort(a.begin(), a.end());
  37.     sort(b.begin(), b.end());
  38.  
  39.     ll max_profit = 0;
  40.  
  41.     for (auto &price : prices)
  42.     {
  43.         ll happy = a.end() - lower_bound(a.begin(), a.end(), price);
  44.         ll nothing = lower_bound(b.begin(), b.end(), price) - b.begin();
  45.         ll sad = n - happy - nothing;
  46.  
  47.         if (sad <= k)
  48.         {
  49.             max_profit = max(max_profit, price * (happy + sad));
  50.         }
  51.     }
  52.  
  53.     cout << max_profit << endl;
  54. }
  55.  
  56. int main()
  57. {
  58.     EGRY ll t = 1;
  59.     // cin >> t;
  60.  
  61.     while (t--)
  62.     {
  63.         solve();
  64.     }
  65.  
  66.     return 0;
  67. }
  68.  
Success #stdin #stdout 0s 5284KB
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https://ideone.com/O1WSLV
language:
C++14 (gcc 8.3)
created:
5 days ago
visibility:
public

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