0217 - Contains Duplicates

0217 - Contains Duplicates

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.

Examples

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

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

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

Constraints

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

Java Solution

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