Solving Additive Number in go. Please try yourself first to solve the problem and submit your implementation to LeetCode before looking into solution.

Problem Description

Additive number is a string whose digits can form additive sequence.

Example 1:

Input: "112358"
Output: true 
Explanation: The digits can form an additive sequence: 1, 1, 2, 3, 5, 8. 
             1 + 1 = 2, 1 + 2 = 3, 2 + 3 = 5, 3 + 5 = 8

Example 2:

Input: "199100199"
Output: true 
Explanation: The additive sequence is: 1, 99, 100, 199. 
             1 + 99 = 100, 99 + 100 = 199

**Follow up:**How would you handle overflow for very large input integers?

See the full details of the problem Additive Number at LeetCode

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