Serialize and Deserialize Binary Tree（C++二叉树的序列化与反序列化）-蒲公英云

Serialize and Deserialize Binary Tree（C++二叉树的序列化与反序列化）

以你之姓@ 2022-09-07 00:08 244阅读 0赞

（1）先序遍历+队列

/**
 * 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) {
        if(!root) return "nullptr,";
        return to_string(root->val)+','+serialize(root->left)+serialize(root->right);
    }
    TreeNode *helper(queue<string> &q) {
        string s=q.front();
        q.pop();
        if(s=="nullptr") return nullptr;
        TreeNode *root=new TreeNode(stoi(s));
        root->left=helper(q);
        root->right=helper(q);
        return root;
    }
    // Decodes your encoded data to tree.
    TreeNode* deserialize(string data) {
        queue<string> q;
        string s="";
        for(int i=0;i<data.length();i++) {
            if(data[i]==',') {
                q.push(s);
                s="";
            } else s+=data[i];
        }
        return helper(q);
    }
};
// Your Codec object will be instantiated and called as such:
// Codec ser, deser;
// TreeNode* ans = deser.deserialize(ser.serialize(root));