<h2 id="heading-url">URL</h2>
<p><a target="_blank" href="https://leetcode.com/problems/permutation-in-string/description/?envType=daily-question&amp;envId=2024-10-05">https://leetcode.com/problems/permutation-in-string/description/?envType=daily-question&amp;envId=2024-10-05</a></p>
<h2 id="heading-code">Code</h2>
<p><a target="_blank" href="https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202410/permutation_in_string/main.fsx">https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202410/permutation_in_string/main.fsx</a></p>
<pre><code class="lang-fsharp"><span class="hljs-keyword">let</span> checkInclusion (s1: string) (s2: string) : bool =
    <span class="hljs-keyword">let</span> table = s1 |&gt; Seq.countBy id |&gt; Seq.sort |&gt; Seq.toList

    s2
    |&gt; Seq.windowed s1.Length
    |&gt; Seq.map (Seq.countBy id &gt;&gt; Seq.sort &gt;&gt; Seq.toList)
    |&gt; Seq.contains table
</code></pre>


## URL

[https://leetcode.com/problems/permutation-in-string/description/?envType=daily-question&envId=2024-10-05](https://leetcode.com/problems/permutation-in-string/description/?envType=daily-question&envId=2024-10-05)

## Code

[https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202410/permutation\_in\_string/main.fsx](https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202410/permutation_in_string/main.fsx)

```fsharp
let checkInclusion (s1: string) (s2: string) : bool =
    let table = s1 |> Seq.countBy id |> Seq.sort |> Seq.toList

    s2
    |> Seq.windowed s1.Length
    |> Seq.map (Seq.countBy id >> Seq.sort >> Seq.toList)
    |> Seq.contains table
```

LeetCode 567. Permutation in String in F#

URL

Code