LeetCode Contains Duplicate

Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the array, and it should return false if every element is distinct.

题意：给出一个数组，判断数组中元素是否有重复

思路：主要是用hash表，java中用现成的hashset

代码如下：

class Solution {public boolean containsDuplicate(int[] nums){Set<Integer> ht = new HashSet<Integer>();int len = nums.length;for (int i = 0; i < len; i++){if (ht.contains(nums[i])) return true;ht.add(nums[i]);}return false;}

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