本文转载于 http://blog.csdn.net/major_zhang/article/details/52197538 2012天津区域赛最水之题: 题意容易读懂,然后就是分情况求出A得分的数学期望,所谓数学期望就是在该概率下的平均得分. 现在就是两种方案,Alice要根据输入给出的数据情况选出最优方案,也就是先选老虎,还是狼. 1.A先选老虎: a.B也先选老虎,则得分为Q(P*X+P*Y); //打完老虎还要打狼 b.B选狼,则两人可以直接获得猎物,则得分为(1-Q)*X 所以1方案…

F - Almost Sorted Array Time Limit:2000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 5532 Description We are all familiar with sorting algorithms: quick sort, merge sort, heap sort, insertion sort, selectio…

Friendship of Frog Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5578 Description N frogs from different countries are standing in a line. Each country is represented by a lowercase letter. The distance betwee…

ZYB's Biology Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5590 Description ZYB(ZJ−267)在NOIP拿到600分之后开始虐生物题,他现在扔给你一道简单的生物题:给出一个DNA序列和一个RNA序列,问它们是否配对. DNA序列是仅由A,C,G,T组成的字符串,RNA序列是仅由A,C,G,U组成的字符串. DNA和RNA匹配当且仅当每…

L - House Building Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5538 Description Have you ever played the video game Minecraft? This game has been one of the world's most popular game in recent years. The wor…

/* 鞍山区域赛的K题..当时比赛都没来得及看(反正看了也不会) 学了polya定理之后就赶紧跑来补这个题.. 由于几何比较烂写了又丑又长的代码,还debug了很久.. 比较感动的是竟然1Y了.. */ 题目大意: 给定一些点,某些点上有边,问用k种颜色染色的等价类有多少种 思路: 由于坐标是整数..只有可能旋转90,180,270才能得到置换 且图形必须为中心对称图形 先用几何方法找出对称中心 然后旋转,找是否出现置换... 由于点数只有50,几何预处理这一部分可以很暴力无脑的写..各种判断相…

Number Sequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 89984    Accepted Submission(s): 21437 Problem Description A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A…

Big Number Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 21106    Accepted Submission(s): 9498 Problem Description In many applications very large integers numbers are required. Some of these…

超级楼梯 Time Limit: / MS (Java/Others) Memory Limit: / K (Java/Others) Total Submission(s): Accepted Submission(s): Problem Description 有一楼梯共M级,刚开始时你在第一级,若每次只能跨上一级或二级,要走上第M级,共有多少种走法? Input 输入数据首先包含一个整数N,表示测试实例的个数,然后是N行数据,每行包含一个整数M(<=M<=),表示楼梯的级数. Outpu…

Problem Description You may have heard of the book '2001 - A Space Odyssey' by Arthur C. Clarke, or the film of the same name by Stanley Kubrick. In it a spaceship is sent from Earth to Saturn. The crew is put into stasis for the long flight, only tw…