排列組合Python解Leetcode 1726 Tuple with Same Product

本片展示如何理解這題排列組合實質內容，以及如何完成 1 行Python程式碼。

[Py3 code請進]

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This film shows how to undertand the combinatorial content for this question, and how write it in 1-line Python code.

[codes on Leetcode]https://leetcode.com/problems/tuple-with-same-product/solutions/6382331/hash-map-vs-sort-radix-sort-2-pointers-vs-1-line-c-100-py3-99-53/

[leetcode Playlist]https://www.youtube.com/watch?v=NayZG_FnMzE&list=PLYRlUBnWnd5IdDHk2BjqXwesydU17z_xk

class Solution:
    def tupleSameProduct(self, nums: List[int]) -> int:
        return sum(f*(f-1)*4 for f in (Counter(x*y for x, y in combinations(nums, 2))).values())