<h2 id="heading-url">URL</h2>
<a target="_blank" href="https://leetcode.com/problems/largest-3-same-digit-number-in-string/description/?envType=daily-question&amp;envId=2023-12-04">https://leetcode.com/problems/largest-3-same-digit-number-in-string/description/?envType=daily-question&amp;envId=2023-12-04</a>
<h2 id="heading-code">Code</h2>
<a target="_blank" href="https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202312/largest_3_same_digit_number_in_string/main.fsx">https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202312/largest_3_same_digit_number_in_string/main.fsx</a>
<pre><code class="lang-fsharp">open System

let largestGoodInteger (num: string) : string =
 let rec largestGoodInteger' (cs: char list) acc =
 match cs with
 | [] -&gt; acc
 | a :: b :: c :: t when a = b &amp;&amp; b = c -&gt;
 let s = [ a; a; a ] |&gt; String.Concat

 if s &gt; acc then
 largestGoodInteger' t s
 else
 largestGoodInteger' t acc
 | _ :: t -&gt; largestGoodInteger' t acc

 largestGoodInteger' (Seq.toList num) ""
</code></pre>

## URL

[https://leetcode.com/problems/largest-3-same-digit-number-in-string/description/?envType=daily-question&envId=2023-12-04](https://leetcode.com/problems/largest-3-same-digit-number-in-string/description/?envType=daily-question&envId=2023-12-04)

## Code

[https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202312/largest\_3\_same\_digit\_number\_in\_string/main.fsx](https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202312/largest_3_same_digit_number_in_string/main.fsx)

```fsharp
open System

let largestGoodInteger (num: string) : string =
    let rec largestGoodInteger' (cs: char list) acc =
        match cs with
        | [] -> acc
        | a :: b :: c :: t when a = b && b = c ->
            let s = [ a; a; a ] |> String.Concat

            if s > acc then
                largestGoodInteger' t s
            else
                largestGoodInteger' t acc
        | _ :: t -> largestGoodInteger' t acc

    largestGoodInteger' (Seq.toList num) ""
```

LeetCode 2264. Largest 3-Same-Digit Number in String in F#

URL

Code