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g0101_0200.s0143_reorder_list.readme.md Maven / Gradle / Ivy

143\. Reorder List

Medium

You are given the head of a singly linked-list. The list can be represented as:

L0 → L1 → … → Ln - 1 → Ln 

_Reorder the list to be on the following form:_

L0 → Ln → L1 → Ln - 1 → L2 → Ln - 2 → … 

You may not modify the values in the list's nodes. Only nodes themselves may be changed.

**Example 1:**

![](https://assets.leetcode.com/uploads/2021/03/04/reorder1linked-list.jpg)

**Input:** head = \[1,2,3,4\]

**Output:** \[1,4,2,3\] 

**Example 2:**

![](https://assets.leetcode.com/uploads/2021/03/09/reorder2-linked-list.jpg)

**Input:** head = \[1,2,3,4,5\]

**Output:** \[1,5,2,4,3\] 

**Constraints:**

*   The number of nodes in the list is in the range [1, 5 * 104].
*   `1 <= Node.val <= 1000`