目录 2018-2019 ICPC, NEERC, Southern Subregional Contest (Codeforces 1070) A.Find a Number(BFS) C.Cloud Computing(线段树) D.Garbage Disposal(模拟) E.Getting Deals Done(二分) F.Debate(贪心) H.BerOS File Suggestion(后缀自动机) I.Privatization of Roads in Berland(网络流)…

2018-2019 ICPC, NEERC, Southern Subregional Contest 闲谈: 被操哥和男神带飞的一场ACM,第一把做了这么多题,荣幸成为7题队,虽然比赛的时候频频出锅,差点被鸽,但还算打完了5h 总的来说这场还是不算难的,7题还是少了点 A 题目: 给出a,b,求出一个数满足是a的倍数,且数字和为b 题解: 男神懒得写博客就甩锅了 直接宽搜,宽搜时队列中的状态保存为x,y,x表示当前的数%a==x,y表示数字和 然后记录状态和方案就行了 参考代码: #inclu…

Problem G. Garden Gathering Input file: standard input Output file: standard output Time limit: 3 seconds Memory limit: 512 megabytes Many of you may have been to St. Petersburg, but have you visited Peterhof Palace? It is a collection of splendid pa…

Problem D. Delay Time Input file: standard input Output file: standard output Time limit: 1 second Memory limit: 512 megabytes Petr and Egor are measuring the gravitational acceleration g on their physics lessons using a special device. An electromag…

2016 NEERC, Moscow Subregional Contest K. Knights of the Old Republic 题意:有一张图,第i个点被占领需要ai个兵,而每个兵传送至该点需要bi的费用.占领第i条边需要其两端点的兵数之和大等于ci.对于已占领的点或边可以免费通行.因此兵达到一个点的手段有传送和沿路走.图上的兵可以在已占领的点.边随意调度. 求占领所有点的最小花费. 思路:将边按ci进行升序排列,对于每条边两端点所在的连通块进行合并,合并细节见代码.这里有一点值得思…

i207M的“怕不是一个小时就要弃疗的flag”并没有生效,这次居然写到了最后,好评=.= 然而可能是退役前和i207M的最后一场比赛了TAT 不过打得真的好爽啊QAQ 最终结果: 看见那几个罚时没,全是我贡献的,还全是睿智的细节错误(逃 不罚时估计就进前100了啊QAQ,我好菜啊.jpg 我切了3道(然后挂了四次2333,i207M切了4道(orz),具体比赛历程太长了,不好写,就在题上写吧=.= A.Find a Number 开场不到十分钟就有神仙切了这神仙题 因为种种原因,这题到吃晚饭的…

从这里开始 题目列表 瞎扯 Problem A Find a Number Problem B Berkomnadzor Problem C Cloud Computing Problem D Garbage Disposal Problem E Getting Deals Done Problem F Debate Problem G Monsters and Potions Problem H BerOS File Suggestion Problem I Privatization of…

Problem D. Distance 题目连接: http://codeforces.com/gym/100714 Description In a large city a cellular network operator is holding a competition for subscribers to promote their new "pedestrian navigator" service. The main prize will be awarded to th…

Problem C. Contest 题目连接: http://codeforces.com/gym/100714 Description The second round of the annual student collegiate programming contest is being held in city N. To be prepared for the inrush of participants, the jury needs to know the number of t…

题目来源:http://codeforces.com/group/aUVPeyEnI2/contest/229511 时间限制:1s 空间限制:512MB 题目大意: 给定一个n 随后跟着2n行输入 "+ t":表示在t时刻获得了一样东西 "- t":表示在t时刻使用了一样东西 求每件东西等待时间的期望(得到的东西无先后顺序) 数据范围: 1 ≤ n ≤ 100 000 t ≤ 1e9 样例: 题目解法: 使用递推式从后往前推 代码: #include <al…

第一次打ACM比赛,和yyf两个人一起搞事情 感觉被两个学长队暴打的好惨啊 然后我一直做傻子题,yyf一直在切神仙题 然后放一波题解(部分) A. Find a Number LINK 题目大意 给你d和s,求你一个最小的数满足是d的倍数且数字和是s 思路 从高位到低位考虑广搜,把当前的长度和模d的余数作为状态,然后添加一个数就在对应的位置上加 一个模数只记录长度最小的状态,然后可以反着贪心回去 yyf的神仙code: #include <iostream> #include <cstd…

秉承ACM团队合作的思想懒,这篇blog只有部分题解,剩余的请前往星感大神Star_Feel的blog食用(表示男神汉克斯更懒不屑于写我们分别代写了下...) C. Cloud Computing 扫描线搞一搞区间(主席树也OK啊,只是空间玄学,主席树理论空间nlogn实际上开小那么10倍8倍没什么锅啊zzzz),对于权值建立权值线段树,然后记录每个权值出现的次数以及区间权值和,然后在线段树上二分求答案即. #include<cstdio> #include<cstring> #i…

A. Altitude 从小到大加入每个数,用set查找前驱和后继即可. 时间复杂度$O(n\log n)$. #include <bits/stdc++.h> using namespace std ; const int Maxn=100020,Inf=1e9; typedef pair<int,int>pi; int n; int a[Maxn]; vector<pi>V; set<int>S; int ans,rep1,rep2,rep3; int…

K. King's Rout time limit per test 4 seconds memory limit per test 512 megabytes input standard input output standard output The great rout will be held this evening in the palace of his majesty Nassah II, the king of Occorom. There are n guests invi…

I. Illegal or Not? time limit per test 1 second memory limit per test 512 megabytes input standard input output standard output The Schengen Agreement was signed by a number of countries to uniform many visa-related questions and to allow tourists fr…

H. Hashing time limit per test 1 second memory limit per test 512 megabytes input standard input output standard output In this problem you are given a byte array a. What you are going to do is to hash its subsequences. Fortunately you don't have to…

C. Colder-Hotter time limit per test 1 second memory limit per test 512 megabytes input standard input output standard output This is an interactive problem. Egor and Petr are playing a game called «Colder-Hotter» on a 2D plane. At the beginning of t…

A. Anagrams time limit per test 1 second memory limit per test 512 megabytes input standard input output standard output Consider the positional numeral system with a given base b. A positive integer x is called b-anagram of a positive integer y if t…

F. Friends time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Three friends Alex, Dmitry and Petr want to go abroad for a better life. They start at 09:00 in the morning in their home city A …

E. Equal Digits time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output For the given integer N and digit D, find the minimal integer K ≥ 2 such that the representation of N in the positional nume…

D. Do it Right! time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Given two distinct positive integers A and B, find out if it is possible to find a third positive integer C so that a triang…

C. CIA Datacenter time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output The CIA has decided to keep up with technology advancements and try to capture all the information passing in the internet…

A. Advanced 2048 time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Only lazy did not play the 2048 game last year. Soon, the secret of success had been revealed and interest to the game has…

比赛链接:http://codeforces.com/gym/100861 A模拟,注意两个特殊的缩写. #include <bits/stdc++.h> using namespace std; typedef pair<string, string> pss; const string MSU = "MSU"; const string SCH = "SCH"; ; map<string, int> school; int n…

A. Find a Number 找到一个树,可以被d整除,且数字和为s 记忆化搜索 static class S{ int mod,s; String str; public S(int mod, int s, String str) { this.mod = mod; this.s = s; this.str = str; } } public static void main(String[] args) { IO io = new IO(); int[][]vis=new int[550…

A. Advertising Strategy 最优策略一定是第一天用$y$元,最后一天再用$x-y$元补满. 枚举所有可能的$y$,然后模拟即可,天数为$O(\log n)$级别. 时间复杂度$O(x\log n)$. #include<cstdio> typedef long long ll; const ll inf=1LL<<60; ll min(ll a,ll b){return a<b?a:b;} ll cal(ll n,ll x,ll o){ ll ans=1;…

题意:有n张照片,每张照片上有一些妹子,要按照片顺序给妹纸安排男朋友,如果妹纸i安排的男朋友之前有女朋友,那么费用+wi,求总费用最小,和输出路径 题解:费用流,先把照片天数建点i连i+1,流量k(最多的男朋友数量),费用0,再把所有按照片顺序出现的妹纸拆点,自己流自己,流量1,费用-inf(保证要安排上),假设当前妹纸是第i天出现的,如果该妹纸之前出现过,我们连一条上一次的到当前点,流量为1,费用0(表示沿用上一次的男朋友),否则从第1个照片点连一条流量为1,费用0的边(表示安排一个之前没有用…

Problem K. KMC Attacks 题目连接: http://codeforces.com/gym/100714 Description Warrant VI is a remote planet located in the Koprulu Sector. Warrant VI features a strange huge field, which was discovered by the Kel-Morian Combine (KMC). The KMC is involved…

Problem J. Joke 题目连接: http://codeforces.com/gym/100714 Description The problem is to cut the largest possible number of circles with diameter y out of a stripe of length x and width y. Input The only line of input consists of two positive real number…

Problem I. Interest Targeting 题目连接: http://codeforces.com/gym/100714 Description A unique display advertisement system was developed at the department of advertising technologies, Yaagl Inc. The system displays advertisements that meet the interests…