Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i].
The product of any prefix or suffix of nums is guaranteed to fit in a 32-bit integer.
You must write an algorithm that runs in O(n) time and without using the division operation.
\n
Example 1:
\nInput: nums = [1,2,3,4]\nOutput: [24,12,8,6]\n
Example 2:
\nInput: nums = [-1,1,0,-3,3]\nOutput: [0,0,9,0,0]\n\n
\n
Constraints:
\n\n2 <= nums.length <= 105-30 <= nums[i] <= 30nums is guaranteed to fit in a 32-bit integer.\n
Follow up: Can you solve the problem in O(1) extra space complexity? (The output array does not count as extra space for space complexity analysis.)
给你一个整数数组 nums，返回 数组 answer ，其中 answer[i] 等于 nums 中除 nums[i] 之外其余各元素的乘积 。
题目数据 保证 数组 nums之中任意元素的全部前缀元素和后缀的乘积都在 32 位 整数范围内。
请 不要使用除法，且在 O(n) 时间复杂度内完成此题。
\n\n
示例 1:
\n\n\n输入: nums =\n\n[1,2,3,4]\n输出:[24,12,8,6]\n
示例 2:
\n\n\n输入: nums = [-1,1,0,-3,3]\n输出: [0,0,9,0,0]\n\n\n
\n\n
提示：
\n\n2 <= nums.length <= 105-30 <= nums[i] <= 30nums之中任意元素的全部前缀元素和后缀的乘积都在 32 位 整数范围内\n\n
进阶：你可以在 O(1) 的额外空间复杂度内完成这个题目吗？（ 出于对空间复杂度分析的目的，输出数组 不被视为 额外空间。）
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