<h2 id="heading-url">URL</h2>
<p><a href="https://leetcode.com/problems/maximum-69-number/" class="autolinkedURL autolinkedURL-url" target="_blank">leetcode.com/problems/maximum-69-number</a></p>
<h2 id="heading-code">Code</h2>
<p><a href="https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/problems/1323/main.fsx" class="autolinkedURL autolinkedURL-url" target="_blank">github.com/syohex/dotnet-study/blob/master/..</a></p>
<pre><code class="lang-fsharp">let maximum69Number (num: int) : int =
    let rec toDigits n acc =
        if n &lt;= 0 then
            acc
        else
            toDigits (n / 10) ((n % 10) :: acc)

    toDigits num []
    |&gt; List.fold
        (fun (sum, ok) n -&gt;
            if ok || n = 9 then
                sum * 10 + n, ok
            else
                sum * 10 + 9, true)
        (0, false)
    |&gt; fst
</code></pre>


## URL

https://leetcode.com/problems/maximum-69-number/

## Code

https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/problems/1323/main.fsx

```fsharp
let maximum69Number (num: int) : int =
    let rec toDigits n acc =
        if n <= 0 then
            acc
        else
            toDigits (n / 10) ((n % 10) :: acc)

    toDigits num []
    |> List.fold
        (fun (sum, ok) n ->
            if ok || n = 9 then
                sum * 10 + n, ok
            else
                sum * 10 + 9, true)
        (0, false)
    |> fst
```

LeetCode 1323. Maximum 69 Number in F#

URL

Code