LeetCode 661. Image Smoother in F#

URL https://leetcode.com/problems/image-smoother/description/?envType=daily-question&envId=2023-12-19 Code https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/problems/0661/main.fsx let imageSmoother (img: int[,]) : int[,] = let ro...