<h2 id="heading-url">URL</h2>
<a target="_blank" href="https://leetcode.com/problems/is-subsequence/description/?envType=daily-question&amp;envId=2023-09-22">Is Subsequence - LeetCode</a>
<h2 id="heading-code">Code</h2>
<a target="_blank" href="https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/challenge/202309/is_subsequence/main.fsx">https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/challenge/202309/is_subsequence/main.fsx</a>
<pre><code class="lang-fsharp">let isSubsequence (s: string) (t: string) : bool =
 let rec isSubsequence' cs ts =
 match cs with
 | [] -&gt; true
 | h :: rest -&gt;
 match List.tryFindIndex ((=) h) ts with
 | None -&gt; false
 | Some(idx) -&gt; isSubsequence' rest (List.skip (idx + 1) ts)

 isSubsequence' (List.ofSeq s) (List.ofSeq t)
</code></pre>

## URL

[Is Subsequence - LeetCode](https://leetcode.com/problems/is-subsequence/description/?envType=daily-question&envId=2023-09-22)

## Code

[https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/challenge/202309/is\_subsequence/main.fsx](https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/challenge/202309/is_subsequence/main.fsx)

```fsharp
let isSubsequence (s: string) (t: string) : bool =
    let rec isSubsequence' cs ts =
        match cs with
        | [] -> true
        | h :: rest ->
            match List.tryFindIndex ((=) h) ts with
            | None -> false
            | Some(idx) -> isSubsequence' rest (List.skip (idx + 1) ts)

    isSubsequence' (List.ofSeq s) (List.ofSeq t)
```

Shohei Yoshida's Blog

Shohei Yoshida's Blog

LeetCode 392. Is Subsequence in F#

URL

Code