Pinned Loading

1. restores a binary tree from a string... restores a binary tree from a string containing positive integers (representing nodes) separated by dashes (representing branches) (e.g. in: "1-2--3--4-5--6--7", out: [1,2,5,3,4,6,7]

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   //* Definition for a binary tree node.

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   function TreeNode(val) {

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       this.val = val;

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       this.left = this.right = null;