<h2 id="heading-url">URL</h2>
<a target="_blank" href="https://leetcode.com/problems/set-mismatch/description/">https://leetcode.com/problems/set-mismatch/description/</a>
<h2 id="heading-code">Code</h2>
<a target="_blank" href="https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202401/set_mismatch/main.fsx">https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202401/set_mismatch/main.fsx</a>
<pre><code class="lang-fsharp">let findErrorNums (nums: int list) : int * int =
 let len = List.length nums

 let rec findErrorNums' nums prev dup miss =
 match nums with
 | [] -&gt; dup, (if miss = -1 then len else miss)
 | h :: t -&gt;
 if h = prev then findErrorNums' t h h miss
 elif h = prev + 2 then findErrorNums' t h dup (h - 1)
 else findErrorNums' t h dup miss

 match List.sort nums with
 | [] -&gt; failwith "never reach here"
 | h :: t -&gt; findErrorNums' t h -1 (if h = 1 then -1 else 1)
</code></pre>

## URL

[https://leetcode.com/problems/set-mismatch/description/](https://leetcode.com/problems/set-mismatch/description/)

## Code

[https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202401/set\_mismatch/main.fsx](https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202401/set_mismatch/main.fsx)

```fsharp
let findErrorNums (nums: int list) : int * int =
    let len = List.length nums

    let rec findErrorNums' nums prev dup miss =
        match nums with
        | [] -> dup, (if miss = -1 then len else miss)
        | h :: t ->
            if h = prev then findErrorNums' t h h miss
            elif h = prev + 2 then findErrorNums' t h dup (h - 1)
            else findErrorNums' t h dup miss

    match List.sort nums with
    | [] -> failwith "never reach here"
    | h :: t -> findErrorNums' t h -1 (if h = 1 then -1 else 1)
```

LeetCode 645. Set Mismatch in F#

URL

Code