<h2 id="heading-url">URL</h2>
<a target="_blank" href="https://leetcode.com/problems/isomorphic-strings/description/">https://leetcode.com/problems/isomorphic-strings/description/</a>
<h2 id="heading-code">Code</h2>
<a target="_blank" href="https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202404/isomorphic_strings/main.fsx">https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202404/isomorphic_strings/main.fsx</a>
<pre><code class="lang-fsharp">let isIsomorphic (s: string) (t: string) : bool =
 let rec isIsomorphic' cs m mapped =
 match cs with
 | [] -&gt; true
 | (c1, c2) :: t -&gt;
 match Map.tryFind c1 m with
 | Some(v) -&gt; if v = c2 then isIsomorphic' t m mapped else false
 | None -&gt;
 if Set.contains c2 mapped then
 false
 else
 isIsomorphic' t (Map.add c1 c2 m) (Set.add c2 mapped)

 let cs = s |&gt; Seq.zip t |&gt; Seq.toList
 isIsomorphic' cs Map.empty Set.empty
</code></pre>

## URL

[https://leetcode.com/problems/isomorphic-strings/description/](https://leetcode.com/problems/isomorphic-strings/description/)

## Code

[https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202404/isomorphic\_strings/main.fsx](https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202404/isomorphic_strings/main.fsx)

```fsharp
let isIsomorphic (s: string) (t: string) : bool =
    let rec isIsomorphic' cs m mapped =
        match cs with
        | [] -> true
        | (c1, c2) :: t ->
            match Map.tryFind c1 m with
            | Some(v) -> if v = c2 then isIsomorphic' t m mapped else false
            | None ->
                if Set.contains c2 mapped then
                    false
                else
                    isIsomorphic' t (Map.add c1 c2 m) (Set.add c2 mapped)

    let cs = s |> Seq.zip t |> Seq.toList
    isIsomorphic' cs Map.empty Set.empty
```

LeetCode 205. Isomorphic Strings in F#

URL

Code