现需要将一根长为正整数 bamboo_len 的竹子砍为若干段，每段长度均为 正整数。请返回每段竹子长度的 最大乘积 是多少。
答案需要取模 1e9+7（1000000007），如计算初始结果为：1000000008，请返回 1。
\n\n\n\n
示例 1：
\n\n\n输入：bamboo_len = 12\n输出：81\n\n\n
\n\n
提示：
\n\n2 <= bamboo_len <= 1000注意：本题与主站 343 题相同：https://leetcode-cn.com/problems/integer-break/
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