<h2 id="heading-url">URL</h2>
<a target="_blank" href="https://leetcode.com/problems/largest-odd-number-in-string/description/?envType=daily-question&amp;envId=2023-12-07">Largest Odd Number in String - LeetCode</a>
<h2 id="heading-code">Code</h2>
<a target="_blank" href="https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/problems/1903/main.fsx">https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/problems/1903/main.fsx</a>
<pre><code class="lang-fsharp">open System

let largestOddNumber (num: string) : string =
 let rec largestOddNumber' (cs: char list) =
 match cs with
 | [] -&gt; ""
 | h :: t -&gt;
 let n = int h - int '0'

 if n % 2 = 1 then
 cs |&gt; List.rev |&gt; String.Concat
 else
 largestOddNumber' t

 largestOddNumber' (num |&gt; Seq.rev |&gt; Seq.toList)
</code></pre>

## URL

[Largest Odd Number in String - LeetCode](https://leetcode.com/problems/largest-odd-number-in-string/description/?envType=daily-question&envId=2023-12-07)

## Code

[https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/problems/1903/main.fsx](https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/problems/1903/main.fsx)

```fsharp
open System

let largestOddNumber (num: string) : string =
    let rec largestOddNumber' (cs: char list) =
        match cs with
        | [] -> ""
        | h :: t ->
            let n = int h - int '0'

            if n % 2 = 1 then
                cs |> List.rev |> String.Concat
            else
                largestOddNumber' t

    largestOddNumber' (num |> Seq.rev |> Seq.toList)
```

LeetCode 1903. Largest Odd Number in String in F#

URL

Code