217. Contains Duplicate

문제

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

풀이

class Solution {
    public boolean containsDuplicate(int[] nums) {
        Set<Integer> set = new HashSet<>();

        for(int n : nums) {
            if(set.contains(n)) {
                return true;
            }
           set.add(n);
        }

        return false;
    }
}