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Solution037.java
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Solution037.java
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package com.portgas;
public class Solution037 {
public static class TreeNode {
int val = 0;
TreeNode left = null;
TreeNode right = null;
public TreeNode(int val) {
this.val = val;
}
}
/**
* 序列化二叉树:
* 请实现两个函数,分别用来序列化和反序列化二叉树。
**/
public String serialize(TreeNode root) {
if (root == null)
return "";
StringBuilder sb = new StringBuilder();
serializeImpl(root, sb);
return sb.toString();
}
private void serializeImpl(TreeNode root, StringBuilder sb) {
if (root == null) {
sb.append("#,");
return;
}
sb.append(root.val);
sb.append(',');
serializeImpl(root.left, sb);
serializeImpl(root.right, sb);
}
int index = -1;
public TreeNode deserialize(String str) {
if (str.length() == 0)
return null;
String[] strs = str.split(",");
return deserializeImpl(strs);
}
private TreeNode deserializeImpl(String[] strs) {
index++;
if (!strs[index].equals("#")) {
TreeNode root = new TreeNode(0);
root.val = Integer.parseInt(strs[index]);
root.left = deserializeImpl(strs);
root.right = deserializeImpl(strs);
return root;
}
return null;
}
}