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46 lines
1.2 KiB
HTML
46 lines
1.2 KiB
HTML
<p>You are given an array of <code>k</code> linked-lists <code>lists</code>, each linked-list is sorted in ascending order.</p>
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<p><em>Merge all the linked-lists into one sorted linked-list and return it.</em></p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> lists = [[1,4,5],[1,3,4],[2,6]]
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<strong>Output:</strong> [1,1,2,3,4,4,5,6]
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<strong>Explanation:</strong> The linked-lists are:
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[
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1->4->5,
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1->3->4,
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2->6
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]
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merging them into one sorted list:
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1->1->2->3->4->4->5->6
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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> lists = []
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<strong>Output:</strong> []
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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> lists = [[]]
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<strong>Output:</strong> []
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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>k == lists.length</code></li>
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<li><code>0 <= k <= 10<sup>4</sup></code></li>
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<li><code>0 <= lists[i].length <= 500</code></li>
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<li><code>-10<sup>4</sup> <= lists[i][j] <= 10<sup>4</sup></code></li>
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<li><code>lists[i]</code> is sorted in <strong>ascending order</strong>.</li>
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<li>The sum of <code>lists[i].length</code> will not exceed <code>10<sup>4</sup></code>.</li>
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</ul>
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