2017 ACM-ICPC 亚洲区(南宁赛区)网络赛  M. Frequent Subsets Problem 题意:给定N和α还有M个U={1,2,3,...N}的子集,求子集X个数,X满足:X是U的子集且出现在M个子集中的次数>=α*M. 题解:因为N<=20,所以U的子集个数最大不过2^20.所以采用二进制把每个子集M映射压缩成一个数,比如: M={1,4,8,10}==>2^(1-0)+2^(4-1)+2^(8-1)+2^(10-1)=1+8+128+512=649(映射记为f,…

HDU 4046 Panda (ACM ICPC 2011北京赛区网络赛) Panda Time Limit: 10000/4000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1816    Accepted Submission(s): 632 Problem Description When I wrote down this letter, you may have…

摘要 本文主要列举并求解了2016 ACM/ICPC亚洲区青岛站现场赛的部分真题,着重介绍了各个题目的解题思路,结合详细的AC代码,意在熟悉青岛赛区的出题策略,以备战2018青岛站现场赛. HDU 5984 Pocky 题意 给出一根棒子(可以吃的)的长度x和切割过程中不能小于的长度d,每次随机的选取一个位置切开,吃掉左边的一半,对右边的棒子同样操作,直至剩余的长度不大于d时停止.现在给出x和d,问切割次数的数学期望是多少. 解题思路 当看到第二个样例2 1时,结果是1.693147,联想到ln…

ACM-ICPC 2018 徐州赛区网络赛  去年博客记录过这场比赛经历:该死的水题  一年过去了,不被水题卡了,但难题也没多做几道.水平微微有点长进.     D. Easy Math 题意:   给定 \(n\), \(m\) ,求 \(\sum _{i=1}^{m} \mu(in)\) .其中 $ 1 \le n \le 1e12$ , $ 1 \le m \le 2e9$ ,\(\mu(n)\) 为莫比乌斯函数.   思路:   容易知道,\(i\) 与 \(n\) 不互质时, \(\m…

参考博客(感谢博主):http://blog.csdn.net/yo_bc/article/details/77917288 题意: 给定一个有向无环图,求该图的最长路. 思路: 由于是有向无环图,所以最长路肯定是一个入度为0到出度为0的路径,拓扑序在确定当前点之前能够考虑到所有到它的情况,所以最后取个最值即可. #include<bits/stdc++.h> using namespace std; const int inf=0x3f3f3f3f; ; ; struct Node { in…

第一次玩ACM...有点小紧张小兴奋.这题目好难啊,只是网赛就这么难...只把最简单的两题做出来了. 题目1: 代码: //#define _ACM_ #include<iostream> #include<cstring> #include<string> #include<vector> #include<map> #include<set> using namespace std; char line[111], word[11…

任意门:http://acm.hdu.edu.cn/showproblem.php?pid=5979 按AC顺序: I - Convex Time limit    1000 ms Memory limit 65536 kB OS Windows We have a special convex that all points have the same distance to origin point. As you know we can get N segments after linki…

鞍山的签到题,求两点之间的距离除以时间的最大值.直接暴力过的. A - Osu! Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 5078 Appoint description:  System Crawler  (2014-10-22) Description Osu! is a very popular music game. B…

In this problem, we will define a graph called star graph, and the question is to find the minimum distance between two given nodes in the star graph. Given an integer nnn, an n−dimensionaln-dimensionaln−dimensional star graph, also referred to as Sn…

There are nnn rectangles on the plane. The problem is to find the area of the union of these rectangles. Note that these rectangles might overlap with each other, and the overlapped areas of these rectangles shall not be counted more than once. For e…