<h2 id="heading-url">URL</h2>
<p><a href="https://leetcode.com/problems/combination-sum-iii/" class="autolinkedURL autolinkedURL-url" target="_blank">leetcode.com/problems/combination-sum-iii</a></p>
<h2 id="heading-code">Code</h2>
<p><a href="https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/problems/0216/main.fsx" class="autolinkedURL autolinkedURL-url" target="_blank">github.com/syohex/dotnet-study/blob/master/..</a></p>
<pre><code class="lang-fsharp">let combinationSum3 (k: int) (n: int) : int list list =
    let rec combinationSum3' num k n acc : int list list =
        if k = 0 then
            if n = 0 then
                [ (acc |&gt; List.rev) ]
            else
                []
        else
            seq { num..9 }
            |&gt; Seq.filter (fun i -&gt; n - i &gt;= 0)
            |&gt; Seq.map (fun i -&gt; combinationSum3' (i + 1) (k - 1) (n - i) (i :: acc))
            |&gt; Seq.fold (fun acc n -&gt; n @ acc) []

    combinationSum3' 1 k n [] |&gt; List.rev
</code></pre>


## URL

https://leetcode.com/problems/combination-sum-iii/

## Code

https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/problems/0216/main.fsx

```fsharp
let combinationSum3 (k: int) (n: int) : int list list =
    let rec combinationSum3' num k n acc : int list list =
        if k = 0 then
            if n = 0 then
                [ (acc |> List.rev) ]
            else
                []
        else
            seq { num..9 }
            |> Seq.filter (fun i -> n - i >= 0)
            |> Seq.map (fun i -> combinationSum3' (i + 1) (k - 1) (n - i) (i :: acc))
            |> Seq.fold (fun acc n -> n @ acc) []

    combinationSum3' 1 k n [] |> List.rev
```

LeetCode 216. Combination Sum III in F#

URL

Code