Solving Count Numbers with Unique Digits in go. Please try yourself first to solve the problem and submit your implementation to LeetCode before looking into solution.

Problem Description

Example:

Input: 2
Output: 91 
             excluding 11,22,33,44,55,66,77,88,99

See the full details of the problem Count Numbers with Unique Digits at LeetCode

Originally posted at: @github.com/halfrost/LeetCode-Go