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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		// your code goes here
  13.           Scanner kb=new Scanner(System.in);
  14.           int n=kb.nextInt();
  15.           int k=kb.nextInt();
  16.  
  17.           int arr[]=new int[n+1];
  18.  
  19.           for(int i=0;i<n;i++){
  20.            arr[i]=kb.nextInt();
  21.           }
  22.  
  23.  
  24.           ArrayList<ArrayList<Integer>>A=new ArrayList<>();
  25.  
  26.           for(int i=0 ;i<n ;i++){
  27.            A.add(new ArrayList<>());
  28.            }
  29.  
  30.            for(int i=0 ;i<n ;i++){
  31.                A.get(arr[i]).add(i);
  32.            }
  33.  
  34.            int ans=0;
  35.  
  36.            for(int val=0;val<n;val++){
  37.            ArrayList<Integer> aa = A.get(val);
  38.             if (aa.isEmpty()) continue;
  39.  
  40.             int i = 0;
  41.             for (int j = 0; j < aa.size(); j++) {
  42.  
  43.                 while (i <= j && (aa.get(j) - aa.get(i) - (j - i)) > k) {
  44.                     i++;
  45.                 }
  46.                 ans = Math.max(ans, j - i + 1);
  47.             }
  48.         }
  49.  
  50.  
  51.          System.out.println(ans);
  52. 	}
  53. }
Success #stdin #stdout 0.18s 54608KB
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https://ideone.com/88Havi
language:
Java (HotSpot 12)
created:
2 days ago
visibility:
public

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