Day 16: 349. Intersection of Two Arrays

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asd32499522 2025-10-16 16:27:25 ‧ 108 瀏覽

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Given two integer arrays nums1 and nums2, return an array of their intersection. Each element in the result must be unique and you may return the result in any order.

Example 1:
Input: nums1 = [1,2,2,1], nums2 = [2,2]
Output: [2]
Example 2:
Input: nums1 = [4,9,5], nums2 = [9,4,9,8,4]
Output: [9,4]
Explanation: [4,9] is also accepted.
解題思路
1.用HashSet來記錄第一個陣列的元素。
2.用另一個HashSet來儲存兩個陣列共有的值。
3.把結果轉成陣列輸出。