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Sum Root to Leaf Numbers

Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is the root-to-leaf path 1->2->3 which represents the number 123 . Find the total sum of all root-to-leaf numbers. Note:  A leaf is a node with no children. Example: Input: [1,2,3] 1 / \ 2 3 Output: 25 Explanation: The root-to-leaf path 1->2 represents the number 12 . The root-to-leaf path 1->3 represents the number 13 . Therefore, sum = 12 + 13 = 25 . Example 2: Input: [4,9,0,5,1] 4 / \ 9 0  / \ 5 1 Output: 1026 Explanation: The root-to-leaf path 4->9->5 represents the number 495. The root-to-leaf path 4->9->1 represents the number 491. The root-to-leaf path 4->0 represents the number 40. Therefore, sum = 495 + 491 + 40 = 1026 .   /**  * Definition for a binary tree node.  * public class TreeNode {  *     int val;  *   ...