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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 sc = new Scanner(System.in);
  14. 		int n = sc.nextInt();
  15. 		int arr[] = new int[n];
  16.  
  17. 		for(int i=0; i<n; i++){
  18. 			int val = sc.nextInt();
  19. 			arr[i]=val;
  20. 		}
  21. 		int k = sc.nextInt();
  22. 		boolean result=false;
  23.  
  24. 		HashSet<Integer> hset = new HashSet<>();
  25. 		for(int i=0; i<n; i++){
  26. 			if(hset.contains(arr[i])){
  27. 				result=true;
  28. 				break;
  29. 			}
  30. 			hset.add(arr[i]);
  31. 			if(i>=k){
  32. 				hset.remove(arr[i-k]);
  33. 			}
  34.  
  35. 		}
  36. 		System.out.println(result);
  37. 	}
  38. }
Success #stdin #stdout 0.15s 54548KB
comments (?)
stdin
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7
10 5 3 4 3 5 6
3
stdout
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true
https://ideone.com/5SYFUa
language:
Java (HotSpot 12)
created:
13 days ago
visibility:
public

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