Convert 1D Array Into 2D Array
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 = 2Output
[[1,2],[3,4]]The first group of n=2 elements, [1,2], becomes the first row, and the second group, [3,4], becomes the second row.
Example 2
Input
original = [1,2,3], m = 1, n = 3Output
[[1,2,3]]All three elements in original are placed into the single row of the constructed 2D array.
Constraints
- 1 <= original.length <= 5 * 10^4
- 1 <= original[i] <= 10^5
- 1 <= m, n <= 4 * 10^4