Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that nums[i] = nums[j] and the difference between i and jis at most k.
public class Solution { public boolean containsNearbyDuplicate(int[] nums, int k) { HashSet<Integer> hashSet = new HashSet<>(); int i = 0; int j = 0; for (; i < nums.length; i++) { if (i - j > k) { hashSet.remove(nums[j]); j++; } if (hashSet.contains(nums[i])) { return true; } hashSet.add(nums[i]); } return false; } }
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