2024每日刷题（148）

Leetcode—297. 二叉树的序列化与反序列化

实现代码

/*** Definition for a binary tree node.* struct TreeNode {*     int val;*     TreeNode *left;*     TreeNode *right;*     TreeNode(int x) : val(x), left(NULL), right(NULL) {}* };*/
class Codec {
public:// Encodes a tree to a single string.string serialize(TreeNode* root) {string ans;function<void(TreeNode*)> preorder = [&](TreeNode* root) {if(root == nullptr) {ans += "null ";return;}ans += to_string(root->val) + " ";preorder(root->left);preorder(root->right);};preorder(root);return ans;}// Decodes your encoded data to tree.TreeNode* deserialize(string data) {istringstream iss(data);queue<string> q;for(string s; iss >> s;) {q.push(s);}function<TreeNode*()> preorder = [&]() {string node = q.front();q.pop();if(node == "null") {return (TreeNode*)nullptr;}TreeNode* newNode = new TreeNode(stoi(node));newNode->left = preorder();newNode->right = preorder();return newNode;};return preorder();}
};// Your Codec object will be instantiated and called as such:
// Codec ser, deser;
// TreeNode* ans = deser.deserialize(ser.serialize(root));

运行结果

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