From LeetCode 349. Intersection of Two Arrays


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.


We need to know one data structure : unordered set.

Set & List comparison

Set will use more space than list, and compute speed is lower

class Solution:
    def intersection(self, nums1: List[int], nums2: List[int]) -> List[int]:
        return list(set(nums1) & set(nums2))