Package g2001_2100.s2022_convert_1d_array_into_2d_array

Class Solution

java.lang.Object

g2001_2100.s2022_convert_1d_array_into_2d_array.Solution

public class Solution
extends Object

2022 - Convert 1D Array Into 2D Array.<p>Easy</p> <p>You are given a <strong>0-indexed</strong> 1-dimensional (1D) integer array <code>original</code>, and two integers, <code>m</code> and <code>n</code>. You are tasked with creating a 2-dimensional (2D) array with <code>m</code> rows and <code>n</code> columns using <strong>all</strong> the elements from <code>original</code>.</p> <p>The elements from indices <code>0</code> to <code>n - 1</code> ( <strong>inclusive</strong> ) of <code>original</code> should form the first row of the constructed 2D array, the elements from indices <code>n</code> to <code>2 * n - 1</code> ( <strong>inclusive</strong> ) should form the second row of the constructed 2D array, and so on.</p> <p>Return <em>an</em> <code>m x n</code> <em>2D array constructed according to the above procedure, or an empty 2D array if it is impossible</em>.</p> <p><strong>Example 1:</strong></p> <p><img src="https://assets.leetcode.com/uploads/2021/08/26/image-20210826114243-1.png" alt="" /></p> <p><strong>Input:</strong> original = [1,2,3,4], m = 2, n = 2</p> <p><strong>Output:</strong> [[1,2],[3,4]]</p> <p><strong>Explanation:</strong> The constructed 2D array should contain 2 rows and 2 columns.</p> <p>The first group of n=2 elements in original, [1,2], becomes the first row in the constructed 2D array.</p> <p>The second group of n=2 elements in original, [3,4], becomes the second row in the constructed 2D array.</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> original = [1,2,3], m = 1, n = 3</p> <p><strong>Output:</strong> <a href="1,2,3">1,2,3</a></p> <p><strong>Explanation:</strong> The constructed 2D array should contain 1 row and 3 columns.</p> <p>Put all three elements in original into the first row of the constructed 2D array.</p> <p><strong>Example 3:</strong></p> <p><strong>Input:</strong> original = [1,2], m = 1, n = 1</p> <p><strong>Output:</strong> []</p> <p><strong>Explanation:</strong> There are 2 elements in original.</p> <p>It is impossible to fit 2 elements in a 1x1 2D array, so return an empty 2D array.</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= original.length <= 5 * 10⁴</code></li> <li><code>1 <= original[i] <= 10⁵</code></li> <li><code>1 <= m, n <= 4 * 10⁴</code></li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int[][]	construct2DArray(int[] original, int m, int n)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

construct2DArray

public int[][] construct2DArray(int[] original,
 int m,
 int n)