1127 ZigZagging on a Tree (30分) 题目链接:1127 ZigZagging on a Tree (30分) 题意 给定二叉树的中序和后序,将二叉树按Z型打印。奇数层从右到左,偶数层从左到右打印。 分析 先根据中序和后序建立一颗二叉树,设置一个vector,stack,使用队列层序遍历,得到每个结点的层次,将奇数层的结点加入栈中,当出...
1127 ZigZagging on a Tree 题目: Suppose that all the keys in a binary tree are distinct positive integers. A unique binary tree can be determined by a given pair of postorder and inorder traversal sequences. And it is a simple standard routine to print the numbers in level-order. However...
1127 ZigZagging on a Tree(30分) 假设二叉树中的所有键都是不同的正整数。可以通过给定的一对后序遍历和有序遍历序列来确定唯一的二叉树。这是一个简单的标准例程,可以按级别顺序打印数字。但是,如果您认为问题太简单了,那就太天真了。这次,您应该按“曲折顺序”打印数字-也就是说,从根开始,逐级打印数字,从...
1127 ZigZagging on a Tree C++版 1.题意 给出一个中序遍历和后序遍历,然后让你求出该树的层次遍历的“之”字型输出。难点在于“之”字型输出。但是真有那么难么?o(~▽~)d 2.分析 主要步骤如下: step 1:由给出的中序序列和后序序列,构建一棵二叉树,这里我不再啰嗦,如有不会的同学,请看我的博客由...
1127 ZigZagging on a Tree (30 point(s)) Suppose that all the keys in a binary tree are distinct positive integers. A unique binary tree can be determined by a given pair of postorder and inorder traversal sequences. And it is a simple standard routine to print the numbers in level-orde...
PAT 甲级 1127 ZigZagging on a Tree 题目链接:https://pintia.cn/problem-sets/994805342720868352/problems/994805349394006016 给一个二叉树的中序和和后序遍历,然后按每层输出,并且要第一层从左到右,第二层从右到左。。反正感觉有点诡异。 做的时候想了半天都没有什么可以偷懒的算法,只好老老实实地建树然后...
PAT 1127. ZigZagging on a Tree (30) Suppose that all the keys in a binary tree are distinct positive integers. A unique binary tree can be determined by a given pair of postorder and inorder traversal sequences. And it is a simple standard routine to print the numbers in level-order. ...
Suppose that all the keys in a binary tree are distinct positive integers. A unique binary tree can be determined by a given pair of postorder and inorder traversal sequences. And it is a simple standard routine to print the numbers in level-order. However, if you think the problem is ...
Suppose that all the keys in a binary tree are distinct positive integers. A unique binary tree can be determined by a given pair of postorder and inorder traversal sequences. And it is a simple sta…
1127 ZigZagging on a Tree #include<bits/stdc++.h>usingnamespacestd;typedeflonglongll;constintN=1e6+100;constintM=N*10;constintmod=1e9+7;constdoubleeps=1e-9;typedefpair<int,int>PII;#define endl '\n'#define x first#define y second#define INF 0x3f3f3f3f#define ls(k) k << 1#def...