序列化二叉树

[hannah-bingo]

/**
 * Definition for a binary tree node.
 * function TreeNode(val) {
 *     this.val = val;
 *     this.left = this.right = null;
 * }
 */

/**
 * Encodes a tree to a single string.
 *
 * @param {TreeNode} root
 * @return {string}
 */
 // 前序遍历
var serialize = function(root) {
    let str = '';
    let reSerialize = (root) => {
        if (root === null){
            str += '#,'
        } else {
            str += root.val + ',';
            root.left = reSerialize(root.left);
            root.right = reSerialize(root.right);
        }
        return str;
    }
    return reSerialize(root);
};

/**
 * Decodes your encoded data to tree.
 *
 * @param {string} data
 * @return {TreeNode}
 */
var deserialize = function(data) {
    let arr = data.split(',')
    console.log(arr);

   const reDeserialize = (arr) => {
        if(arr[0] === '#') {
            arr.shift();
            return null;
        }
        const root = new TreeNode(parseInt(arr[0]));
        arr.shift();
        root.left = reDeserialize(arr);
        root.right = reDeserialize(arr);
        return root;
   }
   return reDeserialize(arr);
};

/**
 * Your functions will be called as such:
 * deserialize(serialize(root));
 */

[gswysy]

var serialize = function(root) {
    return JSON.stringify(root)
};


var deserialize = function(data) {
    return JSON.parse(data)
};

[gswysy]

var serialize = function(root) {
    if(!root) return 'N'
    let left = serialize(root.left)
    let right = serialize(root.right)
    return `${root.val},${left},${right}`
};
var deserialize = function(data) {
    const arr = data.split(',')
    function fn(){
        let item = arr.shift()
        if(item==='N') return null
        const root = new TreeNode(item)
        root.left = fn()
        root.right = fn()
        return root
    }
    return fn()
};