A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes with keys less than or equal to the node's key. The right subtree of a node contains only nodes with…

https://pintia.cn/problem-sets/994805342720868352/problems/994805355987451904 A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes with keys less than or…

题目 A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The lef subtree of a node contains only nodes with keys less than or equal to the node's key. The right subtree of a node contains only nodes wi…

题目:二叉排序树,统计最后两层节点个数 思路:数组格式存储,insert建树,dfs遍历 #include<cstdio> #include<iostream> #include<cstring> #include<algorithm> using namespace std; typedef long long LL; const int INF = 0x7FFFFFFF; const int maxn = 1e5 + 10; int n, cnt[max…

1115. Counting Nodes in a BST (30) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nod…

1115 Counting Nodes in a BST (30 分) A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes with keys less than or equal to the node's key. The right subtre…

A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes with keys less than or equal to the node's key. The right subtree of a node contains only nodes with…

题意: 输入一个正整数N(<=1000),接着输入N个整数([-1000,1000]),依次插入一棵初始为空的二叉排序树.输出最底层和最底层上一层的结点个数之和,例如x+y=x+y. AAAAAccepted code: #define HAVE_STRUCT_TIMESPEC #include<bits/stdc++.h> using namespace std; typedef struct Node{ int value; int vis; int level; int visl,…

A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes with keys less than or equal to the node's key. The right subtree of a node contains only nodes with…

题意:给出一个序列,构建二叉搜索树(BST),输出二叉搜索树最后两层的节点个数n1和n2,以及他们的和sum: n1 + n2 = sum 递归建树,然后再dfs求出最大层数,接着再dfs计算出最后两层的节点个数,也可以直接一遍dfs,顺便存储各个层的节点数. #include <iostream> #include <cstdio> #include <algorithm> #include <string.h> #define LEFT 1 #defin…

简单题.统计一下即可. #include<cstdio> #include<cstring> #include<cmath> #include<vector> #include<map> #include<queue> #include<stack> #include<algorithm> using namespace std; +; struct Node { int left; int right; in…

A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes with keys less than or equal to the node's key. The right subtree of a node contains only nodes with…

Source: PAT A1115 Counting Nodes in a BST (30 分) Description: A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes with keys less than or equal to the no…

1115. Counting Nodes in a BST (30) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nod…

1115 Counting Nodes in a BST(30 分) A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes with keys less than or equal to the node's key. The right subtree…

1115 Counting Nodes in a BST (30 分) A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes with keys less than or equal to the node's key. The right subtre…

PAT甲级1049. Counting Ones 题意: 任务很简单:给定任何正整数N,你应该计算从1到N的整数的十进制形式的1的总数.例如,给定N为12,在1,10, 11和12. 思路: <编程之美>2.4. 计算每位出现1的次数.所有的加起来就是答案了. 如果该位为0.如12012的百位数. 说明永远取不到121xx的形式.那么这个就相当于12000以下的数所有的可能.所以就是就是这样的形式 n(1)xx ,n为[0,11]所以就是12 * 100 ,即1200种可能. 如果为1.如12…

PAT甲级:1064 Complete Binary Search Tree (30分) 题干 A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes with keys less than the node's key. The right subtre…

A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes with keys less than or equal to the node's key. The right subtree of a node contains only nodes with…

题目:https://pintia.cn/problem-sets/994805342720868352/problems/994805343727501312 题意: 给定一个二叉搜索树,以及他的前序遍历序列. 现在有m组询问,对于给定的两个关键字值u,v问他们的最近公共祖先是谁. 思路: 根本跟LCA都没关系好吗.m不是很大,每组询问都查找一次u和v就行了. 因为是BST所以根据前序序列可以直接建出这棵树. 然后在树上查找u和v. 本来还用了一个vector分别存根到u,v的路径,然后两个循…

https://pintia.cn/problem-sets/994805342720868352/problems/994805521431773184 A family hierarchy is usually presented by a pedigree tree. Your job is to count those family members who have no child. Input Specification: Each input file contains one t…

1049. Counting Ones (30) 时间限制 100 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue The task is simple: given any positive integer N, you are supposed to count the total number of 1's in the decimal form of the integers from 1 to N. For exam…

1049 Counting Ones (30 分)   The task is simple: given any positive integer N, you are supposed to count the total number of 1's in the decimal form of the integers from 1 to N. For example, given N being 12, there are five 1's in 1, 10, 11, and 12. I…

A family hierarchy is usually presented by a pedigree tree. Your job is to count those family members who have no child. Input Specification: Each input file contains one test case. Each case starts with a line containing 0, the number of nodes in a…

题目:https://pintia.cn/problem-sets/994805342720868352/problems/994805430595731456 题意: 给定n,问0~n中,1的总个数是多少. 思路: 问的是总个数,所以不需要考虑重复,只用考虑每一位上的贡献就行了. 将数字分成三部分,left(共i位),now和right(共j位) 如果当前now是0, 那么所有前i位是[0,left)的数字都+1个贡献,这些数一共有$left*10^j$个 如果当前now是[2,9],那么所有…

参考:https://blog.csdn.net/qq278672818/article/details/54915636 首先贴上我一开始的部分正确代码: #include<bits/stdc++.h> using namespace std; ; struct node { int level,child;//level为该节点层数,child为该节点孩子数 node() { level=; child=; } }no[N]; int n,m; int ans[N];//ans[i]为第i…

题意:给出一棵二叉搜索树的插入序列,要求该树最后两层的结点个数. 思路:在树结点中增加一个数据域layer,表示该结点所在的层次.另外,设置数组level[]和变量maxLevel,level[i]表示第i层的结点个数,maxLevel表示树的最大层次,在层序遍历时更新即可. 代码: #include <cstdio> #include <queue> using namespace std; ]={}; ; struct Node{ int val; int layer; Nod…

The task is simple: given any positive integer N, you are supposed to count the total number of 1's in the decimal form of the integers from 1 to N. For example, given N being 12, there are five 1's in 1, 10, 11, and 12. Input Specification: Each inp…

链接:1135. Is It A Red-Black Tree (30) 红黑树的性质: (1) Every node is either red or black. (2) The root is black. (3) Every leaf (NULL) is black. (4) If a node is red, then both its children are black. (5) For each node, all simple paths from the node to de…

1099. Build A Binary Search Tree (30) 时间限制 100 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only…