How to Solve Additive Number Problem
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Additive Number
An additive number is a string whose digits can form an additive sequence. A valid additive sequence should contain at least three numbers. Except for the first two numbers, each subsequent number in ...
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Understanding the Additive Number Problem
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Problem Statement
An additive number is a string whose digits can form an additive sequence. A valid additive sequence should contain at least three numbers. Except for the first two numbers, each subsequent number in the sequence must be the sum of the preceding two. Given a string containing only digits, return true if it is an additive number or false otherwise. Note: Numbers in the additive sequence cannot have leading zeros, so sequence 1, 2, 03 or 1, 02, 3 is invalid.
Additive Number
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Examples
"112358"trueThe digits can form an additive sequence: 1, 1, 2, 3, 5, 8. 1 + 1 = 2, 1 + 2 = 3, 2 + 3 = 5, 3 + 5 = 8
"199100199"trueThe additive sequence is: 1, 99, 100, 199. 1 + 99 = 100, 99 + 100 = 199
Constraints
1 <= num.length <= 35num consists only of digits.Follow up: How would you handle overflow for very large input integers?How Interview Coder Helps with Leetcode Problems
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