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  1. #include <iostream>
  2. #include <bits/stdc++.h>
  3. using namespace std;
  4. int main()
  5. {
  6.     int t;
  7.     cin >> t;
  8.     while (t--)
  9.     {
  10.         int n, k;
  11.         cin >> n >> k;
  12.         vector<int> A(n,0);
  13.         unordered_map<int, int> mp;
  14.         for(int i=0;i<n;i++)
  15.         {
  16.             cin>>A[i];
  17.             mp[A[i]]++;
  18.         }
  19.         long long  ans = 1;
  20.         sort(A.begin(),A.end());
  21.         vector<int> cost;
  22.         for (int i = 0; i < k; i++)
  23.         {
  24.             cost.push_back(A[i]);
  25.         }
  26.         int mx = *max_element(cost.begin(),cost.end());
  27.         int i = 0;
  28.         for (i = 0; i < k; i++)
  29.         {
  30.             if (A[i] == mx)
  31.             {
  32.                 break;
  33.             }
  34.         }
  35.         while (i < k)
  36.         {
  37.             ans = ans * mp[mx];
  38.             mp[mx]--;
  39.             i++;
  40.         }
  41.         cout << ans << endl;
  42.     }
  43.  
  44.     return 0;
  45. }
Success #stdin #stdout 0.01s 5280KB
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https://ideone.com/CYW5Wr
language:
C++ (gcc 8.3)
created:
186 days ago
visibility:
secret

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