Solution: Additive Number
Explore how to implement a backtracking algorithm to solve the additive number problem, identifying sequences where each number is the sum of the two preceding. Understand constraints such as no leading zeros and learn to prune the search efficiently. This lesson helps you master handling complex string partitioning tasks for coding interviews.
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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...