22. Product of Array Except Self
Return an array where answer[i] is the product of every value in nums except nums[i].
Solve it in O(n) time without using division.
範例 1:
輸入： nums = [1,2,3,4] 輸出： [24,12,8,6]
範例 2:
輸入： nums = [-1,1,0,-3,3] 輸出： [0,0,9,0,0]
限制條件：
1 <= nums.length <= 10^5