<h2 id="heading-url">URL</h2>
<p><a target="_blank" href="https://leetcode.com/problems/combinations/description/">Combinations - LeetCode</a></p>
<h2 id="heading-code">Code</h2>
<p><a target="_blank" href="https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/problems/0077/main.fsx">https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/problems/0077/main.fsx</a></p>
<pre><code class="lang-plaintext">let combine (n: int) (k: int) : int list list =
    let rec combine' start n k acc len ret =
        if len &gt;= k then
            (List.rev acc) :: ret
        else
            seq { start..n }
            |&gt; Seq.fold (fun ret i -&gt; combine' (i + 1) n k (i :: acc) (len + 1) ret) ret

    combine' 1 n k [] 0 []
</code></pre>


## URL

[Combinations - LeetCode](https://leetcode.com/problems/combinations/description/)

## Code

[https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/problems/0077/main.fsx](https://github.com/syohex/dotnet-study/tree/master/fsharp/leetcode/problems/0077/main.fsx)

```plaintext
let combine (n: int) (k: int) : int list list =
    let rec combine' start n k acc len ret =
        if len >= k then
            (List.rev acc) :: ret
        else
            seq { start..n }
            |> Seq.fold (fun ret i -> combine' (i + 1) n k (i :: acc) (len + 1) ret) ret

    combine' 1 n k [] 0 []
```

LeetCode 77. Combinations in F#

URL

Code