<h2 id="heading-url">URL</h2>
<p><a target="_blank" href="https://leetcode.com/problems/swap-nodes-in-pairs/description/">Swap Nodes in Pairs - LeetCode</a></p>
<h2 id="heading-code">Code</h2>
<p><a target="_blank" href="https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/challenge/202305/swap_nodes_in_pairs/main.fsx">https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/challenge/202305/swap_nodes_in_pairs/main.fsx</a></p>
<pre><code class="lang-plaintext">type ListNode =
    | Leaf
    | Node of int * ListNode

let swapPair (head: ListNode) =
    let rec swapPair' node =
        match node with
        | Leaf -&gt; Leaf
        | Node(v1, next1) -&gt;
            match next1 with
            | Leaf -&gt; node
            | Node(v2, next2) -&gt; Node(v2, Node(v1, swapPair' next2))

    swapPair' head
</code></pre>


## URL

[Swap Nodes in Pairs - LeetCode](https://leetcode.com/problems/swap-nodes-in-pairs/description/)

## Code

[https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/challenge/202305/swap\_nodes\_in\_pairs/main.fsx](https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/challenge/202305/swap_nodes_in_pairs/main.fsx)

```plaintext
type ListNode =
    | Leaf
    | Node of int * ListNode

let swapPair (head: ListNode) =
    let rec swapPair' node =
        match node with
        | Leaf -> Leaf
        | Node(v1, next1) ->
            match next1 with
            | Leaf -> node
            | Node(v2, next2) -> Node(v2, Node(v1, swapPair' next2))

    swapPair' head
```

LeetCode 24. Swap Nodes in Pairs in F#

URL

Code