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[leetcode] day91- duplicate elements exist

2022-07-01 06:20:00 【Upside down, it's a circle】

subject

217. There are duplicate elements 【 Simple 】

Answer key

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