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Grokking the Coding Interview Patterns in JavaScript

Solution: Construct Target Array With Multiple Sums

Understand how to solve the problem of constructing a target array from all ones by working backward with heaps and modulo operations. Learn how to optimize the process to achieve efficient time and space complexity, handling large arrays and ensuring valid transformations.

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Statement

You are given an array target of n integers.

Starting from an array arr of size n where every element is 1, you may perform the following operation any number of times:

  • Let x be the sum of all current elements in arr.

  • Pick an index i and set arr[i] = x.

Your task is to return True if it’s possible to construct target from arr, otherwise return False.

Constraints:

  • n == target.length ...