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Product of Array Except Self

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Description

https://leetcode.com/problems/product-of-array-except-self/description/

Solution

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class Solution:
    def productExceptSelf(self, nums):
        """
        :type nums: List[int]
        :rtype: List[int]
        """
        if nums is None or len(nums) == 0 or len(nums) == 1:
            return []
        
        multi = 1
        left = [1 for i in range(len(nums))]
        for i in range(1, len(nums)):
            multi *= nums[i - 1] 
            left[i] = multi
        
        multi = 1
        right = [1 for i in range(len(nums))]
        for j in range(len(nums) - 2, -1, -1):
            multi *= nums[j + 1]
            right[j] = multi
        
        ret = []
        for k in range(len(nums)):
            ret.append(left[k] * right[k])
            
        return ret