LeetCode 2264. Largest 3-Same-Digit Number in String in F#

URL https://leetcode.com/problems/largest-3-same-digit-number-in-string/description/?envType=daily-question&envId=2023-12-04 Code https://github.com/syohex/dotnet-study/blob/master/fsharp/leetcode/challenge/202312/largest_3_same_digit_number_in_strin...