leetcode Contains Duplicate
Contains Duplicate 題目:https://leetcode.com/problems/contains-duplicate/
包含重複元素:
使用Set,檢測是否符合包含重複元素。
public static void main(String[] args) { int[] arr={1,2,3,1}; boolean flag = containsDuplicate(arr); System.out.println(flag); } public static boolean containsDuplicate(int[] nums) { Set<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; }
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