Sign of the Product of an Array（LeetCode 1822，仓库内对应题解文件统一命名为 1822-sign-of-the-product-of-an-array.*）要求：给定一个整数数组 nums，返回所有元素乘积的符号函数值——乘积为正返回 1，乘积为负返回 -1，乘积为零返回 0。本文以 ...

前缀积/后缀积（Prefix/ Suffix Product） ：理解如何从左到右、从右到左分别构建累积乘积，从而避免重复计算。这一思想与本仓库中 products-of-array-discluding-self.md 所强调的方向一致，也是很多数组类题目的通用范式。 数组遍历（Array Traversal） ：能够通过多趟扫描数组构建中间结果，在空间与时间之间 ...

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