https://leetcode-cn.com/problems/serialize-and-deserialize-binary-tree/

    1. /**
    2.  * Definition for a binary tree node.
    3.  * class TreeNode {
    4.  *     val: number
    5.  *     left: TreeNode | null
    6.  *     right: TreeNode | null
    7.  *     constructor(val?: number, left?: TreeNode | null, right?: TreeNode | null) {
    8.  *         this.val = (val===undefined ? 0 : val)
    9.  *         this.left = (left===undefined ? null : left)
    10.  *         this.right = (right===undefined ? null : right)
    11.  *     }
    12.  * }
    13.  */
    15. /*
    16.  * Encodes a tree to a single string.
    17.  */
    18. function serialize(root: TreeNode | null): string {
    19.   return rserialize(root, '');
    20. }
    22. /*
    23.  * Decodes your encoded data to tree.
    24.  */
    25. function deserialize(data: string): TreeNode | null {
    26.   const arr = data.split(',');
    27.   return buildTree(arr);
    28. }
    30. function rserialize(root: TreeNode | null, str: string) {
    31.   if (root === null) {
    32.     str+= 'None,';
    33.   } else {
    34.     str += root.val + ',';
    35.     str = rserialize(root.left, str);
    36.     str = rserialize(root.right, str);
    37.   }
    38.   return str;
    39. }
    41. function buildTree(list: string[]) {
    42.   const rootVal = list.shift();
    43.   if (rootVal === 'None') return null;
    44.   const root = new TreeNode(parseInt(rootVal));
    45.   root.left = buildTree(list);
    46.   root.right = buildTree(list);
    47.   return root;
    48. }

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