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Solution: Squaring a Sorted Array

Problem Statement

Given a sorted array, create a new array containing squares of all the numbers of the input array in the sorted order.

Example 1:

Input: [-2, -1, 0, 2, 3]
Output: [0, 1, 4, 4, 9]

Example 2:

Input: [-3, -1, 0, 1, 2]
Output: [0, 1, 1, 4, 9]

Constraints:

  • 1 <= arr.length <= 10<sup>4</sup>
  • -10<sup>4</sup> <= arr[i] <= 10<sup>4</sup>
  • arr is sorted in non-decreasing order.

Solution

We can use a brute-force approach to iterate the input array and calculate the square of each number

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