F. Two Points time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output There are two points (x1, y1) and (x2, y2) on the plane. They move with the velocities (vx1, vy1) and (vx2, vy2). Find the min…

http://codeforces.com/gym/100735 D题 直接暴力枚举 感觉这道题数据有点问题 为什么要先排下序才能过?不懂.. #include <stdio.h> #include <math.h> #include <string.h> #include <stdlib.h> #include <iostream> #include <sstream> #include <algorithm> #inc…

一句话题意:x0=1,xi+1=(Axi+xi%B)%C,如果x序列中存在最早的两个相同的元素,输出第二次出现的位置,若在2e7内无解则输出-1. 题解:都不到100天就AFO了才来学这floyd判圈算法. 介绍一下floyd判圈算法:该算法适用于在线性时间复杂度内判断有限自动机.迭代函数.链表中是否有环,求环的起点(即链长)和环长. 可以先这么做:首先从起点S出发,给定两个指针,一个快指针一个慢指针,然后每次快指针走1步,慢指针走2步,直到相遇为止.如果已经到达终点/达到规定步数时仍然没有相遇…

 2017 JUST Programming Contest 2.0 题目链接:Codeforces gym 101343 J.Husam and the Broken Present 2 J. Husam and the Broken Present 2 time limit per test:1.0 s memory limit per test:256 MB input:standard input output:standard output After you helped Husam…

题目描述: C. Elections time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output As you know, majority of students and teachers of Summer Informatics School live in Berland for the most part of the year…

C - Important RoadsTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=88926#problem/C Description The city where Georgie lives has n junctions some of which are connected by bidirectional roads. Every d…

题目传送门 传送门 题目大意 $m$只鼹鼠有$n$个巢穴,$n - 1$条长度为$1$的通道将它们连通且第$i(i > 1)$个巢穴与第$\left\lfloor \frac{i}{2}\right\rfloor$个巢穴连通.第$i$个巢穴在最终时允许$c_i$只醒来的鼹鼠最终停留在这.已知第$i$只鼹鼠在第$p_i$个巢穴睡觉.要求求出对于每个满足$1 \leqslant k \leqslant n$的$k$,如果前$k$只鼹鼠醒来,最小的移动距离的总和. 考虑费用流的建图和暴力做法,把原图的…

题目传送门 传送门 题目大意 给定一个长度为$n$的序列,要求划分成最少的段数,然后将这些段排序使得新序列单调不减. 考虑将相邻的相等的数缩成一个数. 假设没有分成了$n$段,考虑最少能够减少多少划分. 我们将这个序列排序,对于权值相同的一段数可以任意交换它们,每两个相邻数在原序列的位置中如果是$i, i + 1$,那么划分的段数就可以减少1. 每次转移我们考虑添加值相同的一段. 每次转移能不能将减少的段数加一取决于当前考虑的数在前一段内有没有出现以及有没有作为最左端点. 因此我们记录一个决策与…

Codeforces Gym 100725K 题意:给定一个初始全0的序列,然后给\(n\)个查询,每一次调用\(Insert(L_i,i)\),其中\(Insert(L,K)\)表示在第L位插入K,如果第L位已经有值了就会先调用\(Insert(L+1,A_L)\)(其中\(A_L\)表示第L位上的值),再将\(A_L\)赋为K.问经过查询后序列的模样. 思路:首先将题意抽象成每次找到从第L位开始第一个0,并将其"拖"回第L位,然后将其更改为K.这个操作很明显可以用FHQ Treap…

codeforces gym 100553I solution 令a[i]表示位置i的船的编号 研究可以发现,应是从中间开始,往两边跳.... 于是就是一个点往两边的最长下降子序列之和减一 魔改树状数组求min #include<cstdio> #include<iostream> #include<cstdlib> #include<cstring> #include<algorithm> #include<cmath> #defi…

codeforces 407 div1 B题(Weird journey) 传送门 题意: 给出一张图,n个点m条路径,一条好的路径定义为只有2条路径经过1次,m-2条路径经过2次,图中存在自环.问满足条件的路径数 题解: 推论:对于一条边u-->v,我们将其选作为那两条边之一,那么剩下一条边必然与之相邻或者是自环,因为这样才能满足这两条边只走1次. 那么这条边的贡献值为这条边的相邻边数+自环数,假如这条边本身为自环,那么由于剩下的边可以任选(前一个推论),贡献值为m-1 这个AC时间很6啊23…

codeforces 407 div1 A题(Functions again) Something happened in Uzhlyandia again... There are riots on the streets... Famous Uzhlyandian superheroes Shean the Sheep and Stas the Giraffe were called in order to save the situation. Upon the arriving, the…

题目链接:公式题 (2) 比赛链接:华东交通大学2018年ACM"双基"程序设计竞赛 题目描述 令f(n)=2f(n-1)+3f(n-2)+n,f(1)=1,f(2)=2 令g(n)=g(n-1)+f(n)+n*n,g(1)=2 告诉你n,输出g(n)的结果,结果对1e9+7取模 输入描述: 多组输入,每行一个整数n(1<=n<=1e9),如果输入为0,停止程序. 输出描述: 在一行中输出对应g(n)的值,结果对1e9+7取模. 示例1 输入 1 5 9 456 0 输出…

CodeForces Gym题目页面传送门 有\(1\)个\(n1\times m1\)的字符矩阵\(a\)和\(1\)个\(n2\times m2\)的字符矩阵\(b\),求\(a,b\)的最大公共子矩阵.输出这个最大公共子矩阵的行数.列数和左上角分别在\(a,b\)中的坐标.若无解,输出\(\texttt{0 0}\).若有多解,输出任意一组. \(n1,m1,n2,m2\in[1,40]\). 如果你还不知道Gym是什么,please点击这个 (以下假设\(n1,m1,n2,m2\)同阶,…

Codeforces GYM 100876 J - Buying roads 题解 才不是因为有了图床来测试一下呢,哼( 题意 给你\(N\)个点,\(M\)条带权边的无向图,选出\(K\)条边,使得得到的子图联通并且总代价最小,输出最小总代价和一种方案. 虽然题目里描述的很冗长,但其实这个图有一些性质:它最初是一条链/一个环,然后再有一些结点直接连到这些在链上/环上的结点.. 下图就是一个(就是样例): 做法 首先我们可以简单的查看点的度数来找到链/环上的点,和连接它们的边. 然后我们可以通过…

Problem G. Grave 题目连接: http://codeforces.com/gym/100531/attachments Description Gerard develops a Halloween computer game. The game is played on a rectangular graveyard with a rectangular chapel in it. During the game, the player places new rectangul…

L. Ministry of Truth Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100187/problem/K Description Andrey works in the Ministry of Truth. His work is changing articles in newspapers and magazines so that they praise the Party an…

Ballot Analyzing Device 题目连接: http://codeforces.com/gym/100269/attachments Description Election committee of Flatland is preparing for presidential elections. To minimize human factor in ballot counting they decided to develop an automated Ballot Ana…

Problem A. Arrangement of Contest 题目连接: http://codeforces.com/gym/100269/attachments Description Little Dmitry and little Petr want to arrange a contest. Their little friends submitted several task proposals and now Dmitry and Petr want to select som…

原题链接:http://codeforces.com/gym/100650/attachments/download/3269/20052006-acmicpc-east-central-north-america-regional-contest-ecna-2005-en.pdf 题意 玩过这个游戏的人会比较熟悉,题目指出,每个细胞如果四周细胞太少了,就会孤独而死,如果细胞周围细胞太多了,就会挤死.给你个布局,问你他的上一代布局会有几种.不过这道题的关键在于wrap around这个词,即边界…

原题链接:http://codeforces.com/gym/100431/attachments/download/2421/20092010-winter-petrozavodsk-camp-andrew-stankevich-contest-37-asc-37-en.pdf 题意 神奇的电路可以通过比较器来实现冒泡. 题解 倒着往回考虑,搞搞就好. 代码 #include<iostream> #include<cstdio> #include<cstring> #…

题目链接:https://codeforces.com/gym/102392/problem/F 题意:被这题题意坑了很久,大意是说有一棵根为 \(1\) 的树,每个节点初始都是白色, \(Alice\) 能在这棵树的某个节点放下一个棋子,并使得该节点变为黑色,然后从 \(Bob\) 开始,两人能轮流移动这个棋子到当前所在节点的任意一个白色的祖先或者后代节点(不需要相邻的节点),并且将移动到的节点染为黑色.谁先不能移动就输了. 分析:看到这道题,大致就是一个树上的博弈问题.我们一开始读错题意,以…

题目链接:https://codeforces.com/gym/102361/problem/A 题意:给定二维平面上的\(n\)个点,\(q\)次询问,每次加入一个点,询问平面上有几个包含该点的直角三角形. 分析:这是一篇鸽了很久的题解,主要原因就是现场赛的时候这题惨遭卡常,锅++.现在回过头来想这题,主要问题出在现场赛时误判了\(map\)的时间复杂度,把极角排序的正确想法成功叉掉,以及现场赛时候的共线计数使用了\(gcd\),使得整体复杂度上升.(但还是有大佬拿gcd思想过了,我太菜了)现…

Space Golf 题目连接: http://codeforces.com/gym/100803/attachments Description You surely have never heard of this new planet surface exploration scheme, as it is being carried out in a project with utmost secrecy. The scheme is expected to cut costs of c…

Music Mess Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100463/attachments Description Francis really likes his music. He especially likes that song ’Zombie Nation’. Or was that the album? Or maybe the album was ’Kernkraft 4…

H. Mysterious Photos Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100187/problem/H Description Everyone probably heard the rumours about the constellation of Bermuda Triangle: any person who looks to this constellation of th…

C. CinderellaTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100685/problem/C Description Cinderella is given a task by her Stepmother before she is allowed to go to the Ball. There are N (1 ≤ N ≤ 1000) bottles with water in th…

Problem H. ICPC QuestTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100500/attachments Description Coach Fegla has invented a song effectiveness measurement methodology. This methodology in simple English means count the frequ…

Problem E. Explicit Formula Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100610 Description Consider 10 Boolean variables x1, x2, x3, x4, x5, x6, x7, x8, x9, and x10. Consider all pairs and triplets of distinct variables amon…

B. Island Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100114 Description On February 30th this year astronauts from the International Space Station flew over the Pacific Ocean and took a picture, on which was discovered a pr…