217. Contains Duplicate

难度: Easy

题目描述

Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.

 

Example 1:

Input: nums = [1,2,3,1]

Output: true

Explanation:

The element 1 occurs at the indices 0 and 3.

Example 2:

Input: nums = [1,2,3,4]

Output: false

Explanation:

All elements are distinct.

Example 3:

Input: nums = [1,1,1,3,3,4,3,2,4,2]

Output: true

 

Constraints:

• 1 <= nums.length <= 105
• -109 <= nums[i] <= 109

解题思路

代码实现

解决方案

java

class Solution {
    public boolean containsDuplicate(int[] nums) {
        
    }
}