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改进文件可读性,使其更符合Python代码规范。
增加为三种解法,其中暴力解法为我自己所写,递归检查为24届数学刘家蔚同学提供,等差数列的性质为网络所得。
三种解法一个比一个高明,在长度较长时,递归算法更有优势,可以避免重复计算和不必要的路径。
而等差数列的性质解法则从数学的角度寻求答案