Web Reference: In-depth solution and explanation for LeetCode 306. Additive Number in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. 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. Given a string containing only digits '0'-'9', write a function to determine if it's an additive number. Note: Numbers in the additive sequence cannot have leading zeros, so sequence 1, 2, 03 or 1, 02, 3 is invalid.
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