Python C++等差數列解Leetcode1716 Calculate Money in Leetcode Bank

等差數列(Arithmetic sequence)絕對是基礎數學，Leetcode1716 Calculate Money in Leetcode Bank這題當然是用O(1)時間的解答方式。

[codes on Leetcode]https://leetcode.com/problems/calculate-money-in-leetcode-bank/solutions/4367685/arithmetic-progression-o-1-handwriting-0ms-beats-100/

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Arithmetic sequence is definitely basic mathematics. The question of Leetcode1716 Calculate Money in Leetcode Bank is of course solved in O(1) time.

[Leetcode playList]https://www.youtube.com/watch?v=0iFR8nafMWE&list=PLYRlUBnWnd5IdDHk2BjqXwesydU17z_xk