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Grokking the Coding Interview Patterns in JavaScript

Solution: Construct Target Array With Multiple Sums

Understand how to determine if a target array can be built from an array of ones using an optimized approach that reverses operations with heap data structures and modular arithmetic. Learn to implement this solution to improve efficiency and handle larger inputs effectively.

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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 ...