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##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
The approach
First pass builds prefix products. Second pass multiplies by suffix products.
function productExceptSelf(nums): n = len(nums) result = [1] * n leftProduct = 1 for i in range(n): result[i] = leftProduct leftProduct *= nums[i] rightProduct = 1 for i in range(n - 1, -1, -1): result[i] *= rightProduct rightProduct *= nums[i] return result
time, extra space.
