Py3 C++算術數列算面積一行解Leetcode 2579 Count Total Number of Colored Cells

Py3 C++算術數列算面積一行解Leetcode 2579  Count Total Number of Colored Cells

利用算術數列面積公式一行解Leetcode 257

[Py3解請進]

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Use the formula for arithmetic progression to compute the area  to obtain 1-line solution.

[codes on Leetcode]https://leetcode.com/problems/count-total-number-of-colored-cells/solutions/6497177/1-liner-o-1-beats-100/

class Solution:
    def coloredCells(self, n: int) -> int:
        return 2*n*(n-1)+1