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Main.java
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Main.java
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package com.company;
class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode(int x) { val = x; }
}
public class Main {
public static void main(String[] args) {
TreeNode a = new TreeNode(1);
TreeNode b = new TreeNode(2);
TreeNode c = new TreeNode(3);
TreeNode d = new TreeNode(4);
TreeNode e = new TreeNode(5);
a.left = b;
a.right = c;
c.left = d;
c.right = e;
Codec codec = new Codec();
String code = codec.serialize(a);
TreeNode root = codec.deserialize(code);
}
}
class Codec {
int index;
public String serialize(TreeNode root) {
StringBuilder res = new StringBuilder();
preorder(root, res);
return res.toString();
}
private void preorder(TreeNode node, StringBuilder str){
if(node == null) {
str.append("#,");
return;
}
str.append(node.val + ",");
preorder(node.left, str);
preorder(node.right, str);
}
public TreeNode deserialize(String data) {
String[] nodes = data.split(",");
return build(nodes);
}
private TreeNode build(String[] nodes){
String node = nodes[index++];
if(node.equals("#"))
return null;
TreeNode root = new TreeNode(Integer.parseInt(node));
root.left = build(nodes);
root.right = build(nodes);
return root;
}
}