Solution: Additive Number
Explore how to solve the additive number problem using backtracking. Understand the recursive approach to verify sequences where each number equals the sum of the previous two, with constraints on leading zeros and sequence length. This lesson helps you implement and optimize this pattern for coding interviews.
We'll cover the following...
Statement
An additive number is a string whose digits can be partitioned into an additive sequence.
A valid additive sequence contains at least three numbers, where every number after the first two is equal to the sum of the two immediately preceding numbers.
Given a string, num, containing only digits, determine whether it represents an additive number. Return TRUE if a valid additive sequence can be formed from the digits of num, and FALSE otherwise.
Note: Numbers in the additive sequence cannot have leading zeros. For example, the sequences
1, 2, 03and1, 02, 3are both invalid.
Constraints:
num.length...