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HDU 3240 Counting Binary Trees(组合数学-斯特林数,数论-整数快速幂,数论-求逆元)
HDU 3240 Counting Binary Trees(组合数学-斯特林数,数论-整数快速幂,数论-求逆元) 题目大意: 问你不超过n个节点的二叉树的方案数,结果要对m求余。 解题思路: 方案数可以划分左右两边划分子问题也就是 h(n)=h(0)*h(n-1)+h(1)*(h-2)+..................+h(n-1)*h(0),一看就是卡特兰数, 关于卡特兰数必须要nlg^n的左右效率的算法解决 百度一下,知道: 令h(0)=1,h(1)=1, catalan数满足: 递推式[1]...
分类:其他好文   时间:2014-08-25 14:59:24    阅读次数:223
2014 SummerTrain Beautiful Garden
There are n trees planted in lxhgww's garden. You can assume that these trees are planted along the X-axis, and the coordinate of ith tree is xi.But i...
分类:其他好文   时间:2014-08-20 02:30:35    阅读次数:347
【DataStructure】Implemantation of Binary Tree
Here is a class for binary trees that directly implements the recursive definition. By extending the AbstractCollectionclass, it remains consistent with the Java Collections Framework....
分类:其他好文   时间:2014-08-20 00:04:26    阅读次数:307
Unique Binary Search Trees II
Given n, generate all structurally unique BST's (binary search trees) that store values 1...n.For example,Given n = 3, your program should return all ...
分类:其他好文   时间:2014-08-18 21:58:52    阅读次数:260
POJ 1095 Trees Made to Order
题目大意: 按照题意将数用二叉树的形式表示出来。将二叉树按照要求形式输出。 解题思路: 由于有图示,可以轻易看出这个顺序跟卡特兰数列有关。且对于任意一个树的任意子树来说,右子树相当于分针,左子树相当于秒针。也就是说当右子树要变换到下一种状态时,左子树要将它所能变换的状态全变换完才可以。 下面是代码: #include #include #include #inclu...
分类:其他好文   时间:2014-08-18 09:16:33    阅读次数:185
【DataStrcutre】Introduction and description of Binary Trees
[Definitions] Here is the recursive definition of a binary tree: A binary tree is either the empty set or a triple T = (x,L,R), where x is a node and L and R are disjoint binary trees, neither of wh...
分类:其他好文   时间:2014-08-18 01:34:43    阅读次数:216
Unique Binary Search Trees
Given n, how many structurally unique BST's (binary search trees) that store values 1...n?For example,Given n = 3, there are a total of 5 unique BST's...
分类:其他好文   时间:2014-08-18 00:03:13    阅读次数:189
Same Tree
Given two binary trees, write a function to check if they are equal or not.Two binary trees are considered equal if they are structurally identical an...
分类:其他好文   时间:2014-08-17 19:49:42    阅读次数:190
ZOJ 3211 Dream City (J) DP
Dream CityTime Limit:1 Second Memory Limit:32768 KBJAVAMAN is visiting Dream City and he sees a yard of gold coin trees. There arentrees in the yard. ...
分类:其他好文   时间:2014-08-16 23:48:01    阅读次数:245
bnu 34982 Beautiful Garden
Beautiful Garden There are n trees planted in lxhgww's garden. You can assume that these trees are planted along the X-axis, and the coordinate of ith tree is xi. But in rece...
分类:其他好文   时间:2014-08-16 21:10:21    阅读次数:174
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