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package com.usher.algorithm.offer;

import java.util.*;

/**

* @Author: Usher

* @Description: 之字形打印二叉树

* 第一行按照从左到右打印的顺序，第二层按照从右到左的顺序打印，第三行按照从左到右的顺序

*/

public class Solution32_3 {

public ArrayList<ArrayList<Integer>> Print(TreeNode pRoot) {

ArrayList<ArrayList<Integer>> ret = new ArrayList<>();

if (pRoot == null)

return ret;

Queue<TreeNode> queue = new LinkedList<>();

queue.add(pRoot);

boolean reverse = false;

while (!queue.isEmpty()) {

ArrayList<Integer> list = new ArrayList<>();

int cnt = queue.size();

for (int i = 0;i < cnt;i++){

TreeNode node = queue.poll();

list.add(node.val);

if (node.left != null)

queue.add(node.left);

if (node.right != null)

queue.add(node.right);

}

if (reverse)

Collections.reverse(list);

reverse = !reverse;

ret.add(list);

}

return ret;

}

}