[LeetCode]Contains Duplicate II
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public class Solution { public boolean containsDuplicate(int[] nums) { if (nums == null) { return false; } HashSet<Integer> set = new HashSet<>(); for (int i = 0; i < nums.length; i++) { if (set.contains(nums[i])) { return true; } else { set.add(nums[i]); } } return false; }}
判断是否存在相同元素之时,Set会被广泛使用,HashSet可以用来完成。
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