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44 lines
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44 lines
2.2 KiB
HTML
<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>
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<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>
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<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>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<img src="https://assets.leetcode.com/uploads/2021/08/26/image-20210826114243-1.png" style="width: 500px; height: 174px;" />
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<pre>
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<strong>Input:</strong> original = [1,2,3,4], m = 2, n = 2
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<strong>Output:</strong> [[1,2],[3,4]]
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<strong>Explanation:</strong> The constructed 2D array should contain 2 rows and 2 columns.
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The first group of n=2 elements in original, [1,2], becomes the first row in the constructed 2D array.
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The second group of n=2 elements in original, [3,4], becomes the second row in the constructed 2D array.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> original = [1,2,3], m = 1, n = 3
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<strong>Output:</strong> [[1,2,3]]
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<strong>Explanation:</strong> The constructed 2D array should contain 1 row and 3 columns.
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Put all three elements in original into the first row of the constructed 2D array.
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</pre>
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<p><strong>Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> original = [1,2], m = 1, n = 1
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<strong>Output:</strong> []
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<strong>Explanation:</strong> There are 2 elements in original.
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It is impossible to fit 2 elements in a 1x1 2D array, so return an empty 2D array.
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 <= original.length <= 5 * 10<sup>4</sup></code></li>
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<li><code>1 <= original[i] <= 10<sup>5</sup></code></li>
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<li><code>1 <= m, n <= 4 * 10<sup>4</sup></code></li>
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</ul>
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