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219. Contains Duplicate II

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 absolute difference between i and j is at most k.

 此题和contains duplicate不同之处在于,给定在一个range里面找是否含有重复数字,做法里面就不可以继续用数组排列顺序了,这里面不能打乱顺序,代码如下: 

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public class Solution {

    public boolean containsNearbyDuplicate(int[] nums, int k) {

        Set<Integer> set = new HashSet<Integer>();

        for(int i=0;i<nums.length;i++){

            if(i>=k+1){

                set.remove(nums[i-k-1]);

            }

            if(set.contains(nums[i])){

                return true;

            }

            set.add(nums[i]);

        }

        return false;

    }

}

219. Contains Duplicate II