<h2 id="heading-url">URL</h2>
<p><a href="https://leetcode.com/problems/guess-number-higher-or-lower/" class="autolinkedURL autolinkedURL-url" target="_blank">leetcode.com/problems/guess-number-higher-o..</a></p>
<h2 id="heading-code">Code</h2>
<p><a href="https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/problems/0374/main.fsx" class="autolinkedURL autolinkedURL-url" target="_blank">github.com/syohex/dotnet-study/blob/master/..</a></p>
<pre><code class="lang-fsharp">let mutable picked = 0

let guess (n: int) : int =
    if n &gt; picked then -1
    elif n = picked then 0
    else 1

let guessNumber (n: int) : int =
    let rec guessNumber' left right =
        let mid = left + ((right - left) / 2)

        match guess mid with
        | 0 -&gt; mid
        | -1 -&gt; guessNumber' left (mid - 1)
        | 1 -&gt; guessNumber' (mid + 1) right
        | _ -&gt; failwith "never reach here"

    guessNumber' 1 n
</code></pre>


## URL

https://leetcode.com/problems/guess-number-higher-or-lower/

## Code

https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/problems/0374/main.fsx

```fsharp
let mutable picked = 0

let guess (n: int) : int =
    if n > picked then -1
    elif n = picked then 0
    else 1

let guessNumber (n: int) : int =
    let rec guessNumber' left right =
        let mid = left + ((right - left) / 2)

        match guess mid with
        | 0 -> mid
        | -1 -> guessNumber' left (mid - 1)
        | 1 -> guessNumber' (mid + 1) right
        | _ -> failwith "never reach here"

    guessNumber' 1 n
```

LeetCode 374. Guess Number Higher or Lower in F#

URL

Code