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<h2><a href="https://leetcode.com/problems/reverse-linked-list/">206. Reverse Linked List</a></h2><h3>Easy</h3><hr><div><p>Given the <code>head</code> of a singly linked list, reverse the list, and return <em>the reversed list</em>.</p> | ||
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<p> </p> | ||
<p><strong class="example">Example 1:</strong></p> | ||
<img alt="" src="https://assets.leetcode.com/uploads/2021/02/19/rev1ex1.jpg" style="width: 542px; height: 222px;"> | ||
<pre><strong>Input:</strong> head = [1,2,3,4,5] | ||
<strong>Output:</strong> [5,4,3,2,1] | ||
</pre> | ||
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<p><strong class="example">Example 2:</strong></p> | ||
<img alt="" src="https://assets.leetcode.com/uploads/2021/02/19/rev1ex2.jpg" style="width: 182px; height: 222px;"> | ||
<pre><strong>Input:</strong> head = [1,2] | ||
<strong>Output:</strong> [2,1] | ||
</pre> | ||
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<p><strong class="example">Example 3:</strong></p> | ||
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<pre><strong>Input:</strong> head = [] | ||
<strong>Output:</strong> [] | ||
</pre> | ||
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<p> </p> | ||
<p><strong>Constraints:</strong></p> | ||
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<ul> | ||
<li>The number of nodes in the list is the range <code>[0, 5000]</code>.</li> | ||
<li><code>-5000 <= Node.val <= 5000</code></li> | ||
</ul> | ||
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<p> </p> | ||
<p><strong>Follow up:</strong> A linked list can be reversed either iteratively or recursively. Could you implement both?</p> | ||
</div> |