<h2 id="heading-url">URL</h2>
<a target="_blank" href="https://leetcode.com/problems/find-the-student-that-will-replace-the-chalk/description/?envType=daily-question&amp;envId=2024-09-02">https://leetcode.com/problems/find-the-student-that-will-replace-the-chalk/description/?envType=daily-question&amp;envId=2024-09-02</a>
<h2 id="heading-code">Code</h2>
<a target="_blank" href="https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202409/find_the_student_that_will_replace_the_chalk/main.fsx">https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202409/find_the_student_that_will_replace_the_chalk/main.fsx</a>
<pre><code class="lang-fsharp">let chalkReplacer (chalk: int list) (k: int) : int =
 let rec chalkReplacer' (chalk: (int * int64) list) (k: int64) =
 match chalk with
 | [] -&gt; failwith "never reach here"
 | (i, h) :: t -&gt; if h &gt; k then i else chalkReplacer' t (k - h)

 let chalk = List.map int64 chalk
 let sum = chalk |&gt; List.sum
 chalkReplacer' (List.indexed chalk) (int64 k % sum)
</code></pre>

## URL

[https://leetcode.com/problems/find-the-student-that-will-replace-the-chalk/description/?envType=daily-question&envId=2024-09-02](https://leetcode.com/problems/find-the-student-that-will-replace-the-chalk/description/?envType=daily-question&envId=2024-09-02)

## Code

[https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202409/find\_the\_student\_that\_will\_replace\_the\_chalk/main.fsx](https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202409/find_the_student_that_will_replace_the_chalk/main.fsx)

```fsharp
let chalkReplacer (chalk: int list) (k: int) : int =
    let rec chalkReplacer' (chalk: (int * int64) list) (k: int64) =
        match chalk with
        | [] -> failwith "never reach here"
        | (i, h) :: t -> if h > k then i else chalkReplacer' t (k - h)

    let chalk = List.map int64 chalk
    let sum = chalk |> List.sum
    chalkReplacer' (List.indexed chalk) (int64 k % sum)
```

LeetCode 1894. Find the Student that Will Replace the Chalk in F#

URL

Code