<h2 id="heading-url">URL</h2>
<a target="_blank" href="https://leetcode.com/problems/maximum-matrix-sum/description/?envType=daily-question&amp;envId=2024-11-24">https://leetcode.com/problems/maximum-matrix-sum/description/?envType=daily-question&amp;envId=2024-11-24</a>
<h2 id="heading-code">Code</h2>
<a target="_blank" href="https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202411/maximum_matrix_sum/main.fsx">https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202411/maximum_matrix_sum/main.fsx</a>
<pre><code class="lang-fsharp">let maxMatrixSum (matrix: int[,]) : int64 =
 matrix
 |&gt; Seq.cast&lt;int&gt;
 |&gt; Seq.map int64
 |&gt; Seq.fold
 (fun (sum, negatives, minVal) n -&gt; sum + abs n, (negatives + if n &lt; 0 then 1 else 0), min minVal (abs n))
 (0L, 0, System.Int64.MaxValue)
 |&gt; fun (sum, negatives, minVal) -&gt; if negatives % 2 = 0 then sum else sum - 2L * minVal
</code></pre>

## URL

[https://leetcode.com/problems/maximum-matrix-sum/description/?envType=daily-question&envId=2024-11-24](https://leetcode.com/problems/maximum-matrix-sum/description/?envType=daily-question&envId=2024-11-24)

## Code

[https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202411/maximum\_matrix\_sum/main.fsx](https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202411/maximum_matrix_sum/main.fsx)

```fsharp
let maxMatrixSum (matrix: int[,]) : int64 =
 matrix
 |> Seq.cast<int>
 |> Seq.map int64
 |> Seq.fold
 (fun (sum, negatives, minVal) n -> sum + abs n, (negatives + if n < 0 then 1 else 0), min minVal (abs n))
 (0L, 0, System.Int64.MaxValue)
 |> fun (sum, negatives, minVal) -> if negatives % 2 = 0 then sum else sum - 2L * minVal
```

LeetCode 1975. Maximum Matrix Sum in F#

URL

Code