2022 - Convert 1D Array Into 2D Array.

Easy

You are given a 0-indexed 1-dimensional (1D) integer array original, and two integers, m and n. You are tasked with creating a 2-dimensional (2D) array with m rows and n columns using all the elements from original.

The elements from indices 0 to n - 1 ( inclusive ) of original should form the first row of the constructed 2D array, the elements from indices n to 2 * n - 1 ( inclusive ) should form the second row of the constructed 2D array, and so on.

Return an m x n 2D array constructed according to the above procedure, or an empty 2D array if it is impossible.

Example 1:

Input: original = 1,2,3,4, m = 2, n = 2

Output: [1,2,3,4]

Explanation: The constructed 2D array should contain 2 rows and 2 columns.

The first group of n=2 elements in original, 1,2, becomes the first row in the constructed 2D array.

The second group of n=2 elements in original, 3,4, becomes the second row in the constructed 2D array.

Example 2:

Input: original = 1,2,3, m = 1, n = 3

Output: [1,2,3]

Explanation: The constructed 2D array should contain 1 row and 3 columns.

Put all three elements in original into the first row of the constructed 2D array.

Example 3:

Input: original = 1,2, m = 1, n = 1

Output: []

Explanation: There are 2 elements in original.

It is impossible to fit 2 elements in a 1x1 2D array, so return an empty 2D array.

Constraints:

• <code>1 <= original.length <= 5 * 10⁴</code>

• <code>1 <= originali<= 10⁵</code>

• <code>1 <= m, n <= 4 * 10⁴</code>