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package code;
import java.util.Arrays;
import java.util.Deque;
import java.util.LinkedList;
/*
* 297. Serialize and Deserialize Binary Tree
* 题意:序列化,反序列化树
* 难度:Hard
* 分类:Tree, Design
* 思路:
* Tips:lc572 序列化的应用
*/
public class lc297 {
public class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode(int x) { val = x; }
}
public class Codec {
private static final String spliter = ",";
private static final String NN = "X";
// Encodes a tree to a single string.
public String serialize(TreeNode root) {
StringBuilder sb = new StringBuilder();
buildString(root, sb);
return sb.toString();
}
private void buildString(TreeNode node, StringBuilder sb) {
if (node == null) {
sb.append(NN).append(spliter);
} else {
sb.append(node.val).append(spliter);
buildString(node.left, sb);
buildString(node.right,sb);
}
}
// Decodes your encoded data to tree.
public TreeNode deserialize(String data) {
Deque<String> nodes = new LinkedList<>();
nodes.addAll(Arrays.asList(data.split(spliter))); //split
return buildTree(nodes);
}
private TreeNode buildTree(Deque<String> nodes) {
String val = nodes.remove();
if (val.equals(NN)) return null;
else {
TreeNode node = new TreeNode(Integer.valueOf(val));
node.left = buildTree(nodes);
node.right = buildTree(nodes);
return node;
}
}
}
}
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