poj 2541 Binary Witch

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Binary Witch http://poj.org/problem?id=2541 Time Limit: 1000MS Memory Limit: 65536K Description Once upon a time in the silent depths of digital forests there lived a Binary Witch. She was able to forecast weather, telling for any day in the…

POJ 2541 Binary Witch（逆序KMP，好题）

逆序KMP,真的是强大! 参考链接,下面有题意解释:http://blog.sina.com.cn/s/blog_6ec5c2d00100tphp.htmlhttp://blog.csdn.net/sdjzping/article/details/8857749http://tech.ddvip.com/2013-09/1380477442203505.html 直接暴力是枚举字符串的后面13个的字母,然后再用KMP匹配,这样的话,就绪要枚举多次,分别是后面的13,12,11....1个字母.但…

笛卡尔树 POJ ——1785 Binary Search Heap Construction

相应POJ 题目:点击打开链接 Binary Search Heap Construction Time Limit: 2000MS Memory Limit: 30000K Total Submissions: 9075 Accepted: 2566 Description Read the statement of problem G for the definitions concerning trees. In the following we define the basic…

poj 1430 Binary Stirling Numbers

Binary Stirling Numbers Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 1761 Accepted: 671 Description The Stirling number of the second kind S(n, m) stands for the number of ways to partition a set of n things into m nonempty subsets.…

poj 1147 Binary codes

Binary codes Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 5647 Accepted: 2201 Description Consider a binary string (b1-bN) with N binary digits. Given such a string, the matrix of Figure 1 is formed from the rotated versions of the…

Poj 2499 Binary Tree(贪心)

题目链接:http://poj.org/problem?id=2499 思路分析:结点向左边移动时结点(a, b)变为( a+b, b),向右边移动时( a, b )变为( a, a + b); 为求最短路径<a1, a2, a3,...,an>, 考虑从已经知道的结点(a, b)开始找出最短路径回到根节点(1, 1),即向左移动次数和向右移动次数最少回到根节点,由贪心算法, 若 a>b 时,a 减少最大即减去 b,若 a < b,b 减少最大即减去a值,循环直到到达根节点(1,…

POJ 1430 Binary Stirling Numbers (第二类斯特林数、组合计数)

题目链接 http://poj.org/problem?id=1430 题解 qaq写了道水题-- 在模\(2\)意义下重写一下第二类Stirling数的递推式: \[S(n,m)=S(n-1,m-1)+(S(n-1,m)\ \text{and}\ m)\] 令\(S'(n,m)=S(n+m,m)\), 那么递推式变成了\(S'(n,m)=S'(n,m-1)+(S'(n-1,m)\ \text{and}\ m)\) 也就相当于从\((0,0)\)走到\((n,m)\)的NE Lattice Pa…