LeetCode 977. Squares of a Sorted Array (javascript solution)

Description:

Given an integer array nums sorted in non-decreasing order, return an array of the squares of each number sorted in non-decreasing order.

Solution:

Time Complexity : O(n)
Space Complexity: O(n)

// Two pointer
var sortedSquares = function(A) {
    let result = [];
    // Left and right pointer
    let l = 0;
    let r = A.length - 1;
    // Position to add squared number to A
    let p = r;

    // Add the higher number to the array and then decrease the pointer
    while (l <= r) {
        if (A[l] ** 2 > A[r] ** 2) {
            result[p--] = A[l++] ** 2;
        } else {
            result[p--] = A[r--] ** 2;
        }
    }

    return result;
};