Explosion at Cafebazaar 时间限制: 1 Sec  内存限制: 128 MB 题目描述 You are an engineer at Cafebazaar and your specialty is understanding networks and their behaviors. Your colleagues have designed a network of n switches with m directed links that connect pairs…

2016 ACM ICPC Asia Region - Tehran A - Tax 题目描述:算税. solution 模拟. B - Key Maker 题目描述:给出\(n\)个序列,给定一个序列,问\(n\)个序列中有多少个序列满足对应位的值小于或等于给定序列的值. solution 模拟. C - IOI 2017 Logo 题目描述:有\(m\)件作品,\(n\)个人投票,每个人可以选三件作品,分别给\(1, 2, 3\)分,每件作品按总分排序,总分相同按得\(3\)分的数量排序,还…

[1635] Explosion 时间限制: 10000 ms 内存限制: 65535 K 问题描述 there is a country which contains n cities connected by n - 1 roads(just like a tree). If you place TNT in one city, all the roads connect these city will be destroyed, now i want to destroy all the…

E. Explosion Exploit time limit per test 2.0 s memory limit per test 256 MB input standard input output standard output In a two player card game, you have nn minions on the board and the opponent has mm minions. Each minion has a health between 11 a…

2018-2019 ACM-ICPC Nordic Collegiate Programming Contest (NCPC 2018)-E. Explosion Exploit-概率+状压dp [Problem Description] 我方有\(n\)个人,对方有\(m\)个人,每个人都有一个健康值\(h_i\),有\(d\)次攻击,每次随机从所有人中选\(1\)个人,减少其\(1\)健康值.问将对方所有人都消灭的概率是多少? [Solution] 方法\(1\): ​ 将所有人的健康值作为…

Chaarshanbegaan at Cafebazaar 题目链接 http://icpc.upc.edu.cn/problem.php?cid=1618&pid=1 题目描述 Chaarshanbegaan is a gathering event at Cafebazaar similar to TGIF events at Google. Some entertainment programs like pantomime, foosball, Xbox/PS4, and several…

Problem Description Everyone knows Matt enjoys playing games very much. Now, he to N. Input The first line of the input contains an integer T, denoting the number of testcases. Then T test cases follow. In the first line of each test ) indicating the…

Problem Description Everyone knows Matt enjoys playing games very much. Now, he is playing such a game. There are N rooms, each with one door. There are some keys(could be none) in each room corresponding to some doors among these N doors. Every key…

题目链接 题意 有n个房间,每个房间里面有若干把钥匙,每把钥匙可以打开对应的一扇门.如果手中没有钥匙,就要随机轰炸一个房间来打开这个房间.如果有钥匙,就要去打开这些房间.问期望轰炸次数是多少. 思路 根据期望的线性性质,总期望轰炸次数就是每个房间被轰炸的概率\(\times\) 1. 所以就考虑每个房间被轰炸的概率. 先理解一下题意,也就是说只要打开了一扇门就可以打开若干扇门.所以可以从每个房间向他房间中钥匙所对应的房间连边. 每个房间被轰炸当且仅当所有可以到达他的房间都没有被轰炸. 所以把上面…

<题目链接> 题目大意: 一个人要打开或者用炸弹砸开所有的门,每个门后面有一些钥匙,一个钥匙对应一个门,告诉每个门里面有哪些门的钥匙.如果要打开所有的门,问需要用的炸弹数量为多少. 解题分析:因为许多门和他们之后的钥匙可能形成闭包的关系,所以,对于所有的闭包而言,只需要炸毁其中的一个门,就可以用其后面的钥匙打开闭包中至少一扇另外的门,一次类推.所以,假设闭包中包含$num$扇门,用炸弹打开闭包中任意一扇门的概率就为:$1/num$(因为炸毁每个闭包的概率为1,即每个闭包必然需要一枚炸弹).所有…