题意略. 思路: 由于xi的选取是任意的,所以我们不用去理会题目中的xi数列条件.主要是把关注点放在长度为L的线段覆盖至少k个整数这个条件上. 像这种取到最小的合法解的问题,我们应该要想到使用二分法来试探. 那么在验证时,如果我们要验证下标为i的的这个项是否能被一个包含k个元素的区间覆盖,就要枚举这个区间左边端点 <= i 并且 右边端点 >= i的所有情况, 在这些情况中,只要存在一个合法的解,那么该项就可以找到一个合法的xi. 如果我们对于每一个项都这么验证,那么我们的时间复杂度无法承受.…

 Gym 101047M Removing coins in Kem Kadrãn Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Practice Description standard input/output Andréh and his friend Andréas are board-game aficionados. They know many of their friend…

 Gym 101047K Training with Phuket's larvae Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Practice Description standard input/output Thai cuisine is known for combining seasonings so that every dish has flavors that are…

Gym 101047E Escape from Ayutthaya Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u  Practice  Description standard input/output Ayutthaya was one of the first kingdoms in Thailand, spanning since its foundation in 1350 to…

 Gym 101047B  Renzo and the palindromic decoration Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Practice Description standard input/output At the ruins of Wat Phra Si Sanphet (วดพระศรสรรเพชญ), one can find famous inscr…

题目链接 http://codeforces.com/gym/101102/problem/J Description standard input/output You are given an array A of integers of size N, and Q queries. For each query, you will be given a set of distinct integers S and two integers L and R that represent a…

题目链接 http://codeforces.com/gym/100917/problem/J Description standard input/outputStatements The jury of Berland regional olympiad in informatics does not trust to contest management systems, so the Berland regional programming contest is judged by th…

题目链接 http://codeforces.com/gym/100917/problem/D problem description Famous Berland coder and IT manager Linus Gates announced his next proprietary open-source system "Winux 10.04 LTS" In this system command "dir -C" prints list of all…

题目链接 http://codeforces.com/gym/101102/problem/D problem  description Given an R×C grid with each cell containing an integer, find the number of subrectangles in this grid that contain only one distinct integer; this means every cell in a subrectangle…

题目链接 http://codeforces.com/gym/101102/problem/C problem description Judge Bahosain was bored at ACM AmrahCPC 2016 as the winner of the contest had the first rank from the second hour until the end of the contest. Bahosain is studying the results of t…

Gym Class  Accepts: 849  Submissions: 4247  Time Limit: 6000/1000 MS (Java/Others)  Memory Limit: 65536/65536 K (Java/Others) Problem Description 众所周知,度度熊喜欢各类体育活动. 今天,它终于当上了梦寐以求的体育课老师.第一次课上,它发现一个有趣的事情.在上课之前,所有同学要排成一列, 假设最开始每个人有一个唯一的ID,从1到NN,在排好队之后,每个…

Weird Cryptography Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u  Gym 100935B Description standard input/output Khaled was sitting in the garden under an apple tree, suddenly! , well... you should guess what happened, a…

Board Game Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u  Gym 100935G Description standard input/outputStatements Feras bought to his nephew Saleem a new game to help him learning calculating. The game consists of a boa…

Gym 100935F A Poet Computer Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Description standard input/output The ACM team is working on an AI project called (Eih Eye Three) that allows computers to write poems. One of th…

Evil Time Limit: 5 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100463/attachments Description Richard is evil. He wants to give another geometry problem to the participants of this contest and I’m afraid I have no choice but to comply. Wh…

Crossings Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100463 Description Given a permutation P of {0, 1, ..., n − 1}, we define the crossing number of it as follows. Write the sequence 0, 1, 2, . . . , n − 1 from left to ri…

J. Deck Shuffling Time Limit: 2   Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100187/problem/J Description The world famous scientist Innokentiy continues his innovative experiments with decks of cards. Now he has a deck of n cards and k…

K. Perpetuum Mobile Time Limit: 2 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100187/problem/K Description The world famous scientist Innokentiy almost finished the creation of perpetuum mobile. Its main part is the energy generator which…

Problem J. Triatrip Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100342/attachments Description The travel agency “Four Russians” is offering the new service for their clients. Unlike other agencies that only suggest one-way…

Problem C. Painting CottagesTime Limit: 2 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100342/attachments Description The new cottage settlement is organized near the capital of Flatland. The construction company that is building the settl…

Problem A. Poetry Challenge Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100500/attachments Description Let’s check another challenge of the IBM ICPC Chill Zone, a poetry challenge. One says a poetry string that starts with a…

F. The Pool for Lucky Ones Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100637/problem/F Description A new swimming pool has been built in Kazan for the forthcoming Water Sports World Championship. The pool has N lanes. Some…

A. Nano alarm-clocks Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100637/problem/A Description An old watchmaker has n stopped nano alarm-clocks numbered with integers from 1 to n. Nano alarm-clocks count time in hours, and…

G. FacePalm Accounting Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100513/problem/G Description An owner of a small company FacePalm has recently learned that the city authorities plan to offer to small businesses to partic…

题目传送门 /* 题意:有一堆砖块,每一次操作可以选择消去任意一行,也可以选择消去任意一列.求要消去所有的砖块需要最小的操作数 贪心:首先清楚的是消去最高列的最佳,消去第一行最佳,行列的顺序只对中间过程影响,和结果无关 首先sort降序,选择消去列的个数,更新最小值 当时想复杂了,貌似是上学期校赛留下的阴影:) 详细解释:http://blog.csdn.net/liao_jingyi/article/details/40455311 */ #include <cstdio> #include…

题目传送门 /* 题意:两个人各掷两个骰子,给出每个骰子的最小值和最大值,其余值连续分布 问两人投掷,胜利的概率谁大 数据小,用4个for 把所有的可能性都枚举一遍,统计每一次是谁胜利 还有更简单的做法,就是四个数相加比大小,ZT说是平均值,竟然被他水过去了:) */ #include <cstdio> #include <iostream> #include <algorithm> #include <cstring> #include <strin…

题目传送门 /* 题意:几个判断,车上的人不能 <0 或 > C:车上初始和结束都不能有人在 (为0):车上满员时才有等候的人 水题:难点在于读懂题目意思,状态不佳,一直没搞懂意思,在这题卡住了 主要要理解have to wait 的意思 */ #include <cstdio> #include <iostream> #include <algorithm> #include <cstring> #include <string>…

A - Coins Time Limit:3000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Description standard input/output Hasan and Bahosain want to buy a new video game, they want to share the expenses. Hasan has a set of N coins and Bahosain has a…

http://codeforces.com/gym/101142/attachments 题意:每个人在TC和CF上分别有两个排名,如果有一个人在任意一个网站上大于另一个人的排名,那么这个人可以打败另外一个人.还有就是如果 B 能打败 A, C 能打败 B,但是 C 直接从排名上看 C 并不能打败 A,但是因为 B -> A 并且 C -> B,所以 C -> B -> A, 即 C 也能(通过打败 B 来)打败 A. 如这个样例: A :5, 5 , B :1, 6,  C:2,…

http://codeforces.com/gym/100781/attachments 题意:有N个点,M条边,问对两两之间的树添加一条边之后,让整棵大树最远的点对之间的距离最近,问这个最近距离是多少. 思路:一开始看成只有两个连通块,后来才注意到是多个连通块.DFS搜树上最长路径.答案有三种:第一种是添加了边之后,树的最长路径还是原来子树的路径,第二种是对子树长度进行排序后,两个最长的距离分别除以2向上取整后加上1.第三种比较难注意到,就是第二第三长的分别除以2向上取整后加上2,因为可能隔着…