Grokking the Coding Interview: Patterns for Coding Questions
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Product of Array Except Self (medium)
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Problem Statement

Given an array of integers, return a new array where each element at index i of the new array is the product of all the numbers in the original array except the one at i. You must solve this problem without using division.

Examples

    • Input: [2, 3, 4, 5]
    • Expected Output: [60, 40, 30, 24]
    • Justification: For the first element: 3*4*5 = 60, for the second element: 2*4*5 = 40, for the third element: 2*3*5 = 30, and for the fourth element: 2*3*4 = 24.
    • Input: [1, 1, 1, 1]
    • Expected Output: [1, 1, 1, 1]
    • Justification: Every element is 1, so the product of all other numbers for each index is also 1.
    • Input: [10, 20, 30, 40]
    • Expected Output: [24000, 12000, 8000, 6000]
    • Justification: For the first element: 20*30*40 = 24000, for the second element: 10*30*40 = 12000, for the third element: 10*20*40 = 8000, and for the fourth element: 10*20*30 = 6000.

Constraints:

  • 2 <= nums.length <= 10<sup>5</sup>
  • -30 <= nums[i] <= 30
  • The product of any prefix or suffix of nums is guaranteed to fit in a 32-bit integer.

Try it yourself

Try solving this question here:

Python3
Python3
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