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  1. import java.util.*;
  2.  
  3. class Main {
  4.     public static boolean nearbyDupli(int[] nums, int k) {
  5.         Map<Integer, Integer> map = new HashMap<>();
  6.  
  7.         for (int i = 0; i < nums.length; ++i) {
  8.             if (map.containsKey(nums[i]) && i - map.get(nums[i]) <= k) {
  9.                 return true;
  10.             }
  11.             map.put(nums[i], i);
  12.         }
  13.         return false;
  14.     }
  15.  
  16.     public static void main(String[] args) {
  17.         Scanner sc=new Scanner(System.in);
  18.         int n=sc.nextInt();
  19.         int[] nums = new int[n];
  20.         for(int i=0;i<n;i++){
  21.             nums[i]=sc.nextInt();
  22.         }
  23.         int k = sc.nextInt();
  24.         if (nearbyDupli(nums, k)) {
  25.             System.out.println("There are two equal numbers within distance " + k);
  26.         } else {
  27.             System.out.println("No two equal numbers found within distance " + k);
  28.         }
  29.         sc.close();
  30.     }
  31. }
Success #stdin #stdout 0.21s 56904KB
comments (?)
stdin 
7
1 2 3 1 2 3 2
2
stdout 
There are two equal numbers within distance 2
https://ideone.com/ij3ldT
language:
Java (HotSpot 12)
created:
3 days ago
visibility:
public

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