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30 lines
1.5 KiB
HTML
30 lines
1.5 KiB
HTML
<p>You are given the <code>head</code> of a <strong>non-empty</strong> linked list representing a non-negative integer without leading zeroes.</p>
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<p>Return <em>the </em><code>head</code><em> of the linked list after <strong>doubling</strong> it</em>.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2023/05/28/example.png" style="width: 401px; height: 81px;" />
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<pre>
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<strong>Input:</strong> head = [1,8,9]
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<strong>Output:</strong> [3,7,8]
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<strong>Explanation:</strong> The figure above corresponds to the given linked list which represents the number 189. Hence, the returned linked list represents the number 189 * 2 = 378.
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2023/05/28/example2.png" style="width: 401px; height: 81px;" />
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<pre>
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<strong>Input:</strong> head = [9,9,9]
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<strong>Output:</strong> [1,9,9,8]
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<strong>Explanation:</strong> The figure above corresponds to the given linked list which represents the number 999. Hence, the returned linked list reprersents the number 999 * 2 = 1998.
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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>The number of nodes in the list is in the range <code>[1, 10<sup>4</sup>]</code></li>
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<li><font face="monospace"><code>0 <= Node.val <= 9</code></font></li>
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<li>The input is generated such that the list represents a number that does not have leading zeros, except the number <code>0</code> itself.</li>
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</ul>
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