fork download
copy 
  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. vector<int> tab;
  5.  
  6. bool czy(int x,int n,int k)
  7. {
  8.     vector<int> lis;
  9.     vector<int> dp(k+3,0);
  10.     for(int i = 0;i < n;++i)
  11.     {
  12.         if(tab[i] >= x)
  13.         {
  14.             lis.push_back(1);
  15.         }
  16.         else
  17.         {
  18.             lis.push_back(0);
  19.         }
  20.     }
  21. int d = (n%k) + ((n%k) == 0 ? n : 0);
  22.     for(int i = n-1;i >= 0;i--)
  23.     {
  24.         int j = i%k;
  25.         dp[j] = max(dp[j],(j+1 < d ? dp[j+1] : 0) + lis[i]);
  26. //cout << dp[j] << " " << j << " dp\n";
  27.     }
  28.    // cout << dp[0] << " " << d << endl;
  29.     if(dp[0] > d/2) return true;
  30.     return false;
  31.     //cout << dp[k-1] << endl;
  32. }
  33.  
  34. int main()
  35. {
  36.     int t;
  37.     cin >> t;
  38.     for(int q = 0;q < t;++q)
  39.     {
  40.         int n,k,x;
  41.         cin >> n >> k;    
  42. 		tab = {};
  43.         for(int i = 0;i < n;++i)
  44.         {
  45.             cin >> x;
  46.             tab.push_back(x);
  47.         }
  48.         //cout << czy(3,n,k);
  49.         int l = 0,p=1000000003,mid;
  50. //czy(6,n,k);
  51.         while(l < p)
  52.         {
  53.             mid = (l+p+1)/2;
  54. //cout << l << " " << p << " lr\n";
  55.             if(czy(mid,n,k) == true)
  56.             {
  57.                 l = mid;
  58.             }
  59.             else
  60.             {
  61.                 p = mid-1;
  62.             }
  63.         }
  64.         cout << l << endl;
  65.     }
  66. }
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin
copy 
5
4 3
3 9 9 2
5 3
3 2 5 6 4
7 1
5 9 2 6 5 4 6
8 2
7 1 2 6 8 3 4 5
4 5
3 4 5 6
stdout
copy 
3
4
0
0
4
https://ideone.com/tFZlhp
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!