Leetcode 297. Serialize and Deserialize Binary Tree

文章作者:Tyan
博客:noahsnail.com  |  CSDN  |  简书

1. Description

Serialize and Deserialize Binary Tree

2. Solution

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
/**
* 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) {
ostringstream out;
serialize(root, out);
return out.str();
}
// Decodes your encoded data to tree.
TreeNode* deserialize(string data) {
istringstream in(data);
return deserialize(in);
}
private:
void serialize(TreeNode* root, ostringstream& out) {
if(!root) {
out << "# ";
return;
}
out << root->val << " ";
serialize(root->left, out);
serialize(root->right, out);
}
TreeNode* deserialize(istringstream& in) {
string val;
in >> val;
if(val == "#") {
return NULL;
}
TreeNode* root = new TreeNode(stoi(val));
root->left = deserialize(in);
root->right = deserialize(in);
return root;
}
};
// Your Codec object will be instantiated and called as such:
// Codec codec;
// codec.deserialize(codec.serialize(root));

Reference

  1. https://leetcode.com/problems/serialize-and-deserialize-binary-tree/description/
如果有收获,可以请我喝杯咖啡!