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Overview ¶
2022 You are given a 0-indexed 1-dimensional (1D) integer array arr, 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 arr.
The elements from indices 0 to n - 1 (inclusive) of arr 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: arr = [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 arr, [1,2], becomes the first row in the constructed 2D array. The second group of n=2 elements in arr, [3,4], becomes the second row in the constructed 2D array. Example 2:
Input: arr = [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 arr into the first row of the constructed 2D array. Example 3:
Input: arr = [1,2], m = 1, n = 1 Output: [] Explanation: There are 2 elements in arr. It is impossible to fit 2 elements in a 1x1 2D array, so return an empty 2D array.
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