C练手题--Progressive Spiral Number Position 【7 kyu】

一.原题

链接：Training on Progressive Spiral Number Position | Codewars

Assume that you started to store items in progressively expanding square location, like this for the first 9 numbers:

二、解题

1、分析

 （1）数字必须存入点组成的正方形中。

（2） 5个数字可用3X3存放，6个必须用4X4。可用下面印证