Most Popular Binary Tree Question in FB Interviews
Most Popular Binary Tree Question in FB Interviews
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LeetCode 129. Sum Root to Leaf Numbers
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You are given the root of a binary tree containing digits from 0 to 9 only.
Each root-to-leaf path in the tree represents a number.
For example, the root-to-leaf path 1 - 2 - 3 represents the number 123.
Return the total sum of all root-to-leaf numbers.
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Time Complexity = O(n), where 'n' is the number of nodes
Space Complexity = O(h), where 'h' is the height of the tree
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