349. Intersection of Two Arrays-两个数组的交集

Given two arrays, write a function to compute their intersection.

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]

Note:

• Each element in the result must be unique.
• The result can be in any order.

Solution in python:

class Solution:
    def intersection(self, nums1: List[int], nums2: List[int]) -> List[int]:
        aset = set(nums1)
        bset = set(nums2)
        result = []
        for item in bset:
            if item in aset:
                result.append(item)
        return result