#2022
Convert 1D Array Into 2D Array
newbie · 265 · lc easy +19 · verified · 72.1% accepted · 1,295 likes · top 81%
Description
Given a 1D integer array original and two integers m and n, reshape it into an m x n 2D array. The first n elements form row 0, the next n elements form row 1, and so on. Return the resulting 2D array, or an empty 2D array if the reshape 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.
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