1170 - Counting Perfect BST   PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Limit: 32 MB BST is the acronym for Binary Search Tree. A BST is a tree data structure with the following properties. i)        Each BST contains a root node…

链接: https://vjudge.net/problem/LightOJ-1170 题意: BST is the acronym for Binary Search Tree. A BST is a tree data structure with the following properties. i) Each BST contains a root node and the root may have zero, one or two children. Each of the chi…

题目链接: http://www.lightoj.com/volume_showproblem.php?problem=1170 题目描述: 给出一些满足完美性质的一列数(x > 1 and y > 1 such that m = xy.) 然后给出一个区间,问在这个区间中的完美数组成的搜索二叉树的个数是多少?解题思路: 1,打标算出所有的完美数列中的数字 2,打表算出卡特兰数列,等着以后用 3,卡特兰数列递推式:F[N] = F[N-1] * ( 4 * N - 2 ) / ( N + 1…

1170 - Counting Perfect BST BST is the acronym for Binary Search Tree. A BST is a tree data structure with the following properties. i)        Each BST contains a root node and the root may have zero, one or two children. Each of the children themsel…

题目大概就是求一个n个不同的数能构造出几种形态的二叉排序树. 和另一道经典题目n个结点二叉树不同形态的数量一个递推解法,其实这两个问题的解都是是卡特兰数. dp[n]表示用n个数的方案数 转移就枚举第几个数作为根,然后分成左右两子树,左右两子树的方案数的乘积就是这个数作根的方案数 另外就是题目得先找到[1,1e10]的perfect power,总共102230个:输入的区间[a,b],b-a>=1e6,也就是最多perfect power的个数大概就在a=1,b=1000001范围内,1110…

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…

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…

B - Counting BST Time Limit:3000MS     Memory Limit:0KB     64bit IO Format:%lld & %llu Submit Status Practice UVALive 5058 Description Binary Search Tree (BST) is a rooted binary tree data structure which has following properties: Left subtree conta…

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…