Contains Duplicate II

问题描述

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.

题目链接

https://leetcode.com/problems/contains-duplicate-ii/description/

Java

题意查找数组中值相同,但是索引差值在k之内。

public class Solution {
public boolean containsNearbyDuplicate(int[] nums, int k) {
if (nums.length <= 1) return false;
Map<Integer, Integer> map = new HashMap();
for (int i = 0; i < nums.length; i++) {
if (map.containsKey(nums[i]) && i - map.get(nums[i]) <= k) {
return true;
} else {
map.put(nums[i], i);
}
}
return false;
}
}