考虑二分答案,转化为求有多少$\leq lim$的数满足条件. 从两侧往中间进行数位DP,设$f[l][r][j][x][y][z][pre][suf]$表示当前准备填的两个位置是$l$和$r$,已经有$j$对相邻的数不同,$l-1$填的是$x$,$r+1$填的是$y$,正序串和逆序串的大小关系为$z$,正序串和$lim$的大小关系为$pre$,逆序串和$lim$的大小关系为$suf$的方案数. 注意到$r=n-l+1$,因此可以省去$r$这一维,然后枚举接下来填什么数进行转移即可. 时间复杂度…

Search GO 说明:输入题号直接进入相应题目,如需搜索含数字的题目,请在关键词前加单引号 Problem ID Title Source AC Submit Y 1000 A+B Problem 10983 18765 Y 1036 [ZJOI2008]树的统计Count 5293 13132 Y 1588 [HNOI2002]营业额统计 5056 13607 1001 [BeiJing2006]狼抓兔子 4526 18386 Y 2002 [Hnoi2010]Bounce 弹飞绵羊 43…

It's said that Aladdin had to solve seven mysteries before getting the Magical Lamp which summons a powerful Genie. Here we are concerned about the fourth mystery. In the cave, Aladdin was moving forward after passing the pathway of magical stones. H…

这些天闲来无事,就整理了一些类库.jQuery插件和自定义控件.今天和大家分享下Magical平台类库代码. 下图为整个解决方案图.MagicalPlatForm里面定义的是众多的Layer层:Magical里面定义的是基本类库和操作类,以及一些自定义的控件:MainFramework里面存放的是该项目的基类库和操作类库:MainProject里面存放的是主项目,这里是WinForm项目NoteSystem:TestProject里面存放的是测试用和实验用的项目:然后部署里存放的是用于部署的Wi…

Magical Forest Time Limit: 24000/12000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 724    Accepted Submission(s): 343 Problem Description There is a forest can be seen as N * M grid. In this forest, there is so…

2014多校7最水的题   Magical Forest Magical Forest Time Limit: 24000/12000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others) Total Submission(s): 253    Accepted Submission(s): 120 Problem Description    There is a forest can be seen as N * M…

C16H:Magical Balls 总时间限制:  1000ms 内存限制:  262144kB 描述 Wenwen has a magical ball. When put on an infinite plane, it will keep duplicating itself forever. Initially, Wenwen puts the ball on the location (x0, y0) of the plane. Then the ball starts to dup…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5973 Game of Taking Stones Time Limit: 2000/1000 MS (Java/Others)Memory Limit: 65536/65536 K (Java/Others) 问题描述 Two people face two piles of stones and make a game. They take turns to take stones. As ga…

[BZOJ1163][BZOJ1339][Baltic2008]Mafia 试题描述 匪徒准备从一个车站转移毒品到另一个车站,警方准备进行布控. 对于每个车站进行布控都需要一定的代价,现在警方希望使用最小的代价控制一些车站,使得去掉这些车站后,匪徒无法从原定的初始点到达目标点 输入 第一行输入N,M代表车站的总个数,及有多少条双向边连接它们. 2<=n<=200 , 1 <=m<=20000. 第二行给出两个数a,b,代表匪徒的出发点及目标点.1<=a,b<=N,a&l…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4573 Problem Description Remember our childhood? A few naked children throw stones standing on the same position, the one throws farther win the game. Aha, of course, there are some naughty boys who care…