LeetCode 217

217. 存在重复元素

Java

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