Description A lot of people associate Logo programming language with turtle graphics. In this case the turtle moves along the straight line and accepts commands "T" ("turn around") and "F" ("move 1 unit forward"). Y…

Spiral Maximum 题目连接: http://codeforces.com/problemset/problem/173/C Description Let's consider a k × k square, divided into unit squares. Please note that k ≥ 3 and is odd. We'll paint squares starting from the upper left square in the following orde…

题目:http://codeforces.com/contest/398/problem/B 有点似曾相识的感觉,记忆中上次那个跟这个相似的 我是用了 暴力搜索过掉的,今天这个肯定不行了,dp方程想了非常久也没有想出来,有点无从下手的感觉,最后还是尝试了一下记忆化搜索,以dp[0][0]为边界,dp[x][y]代表当前有x行y列没有彩色的 瓷砖,搜索起来思路还是非常清晰的,可惜最后那个 算期望公式给写错了,瞎了好久,做出以后看了一下别人的做法,确实有点难想到,把涂好的都放在右下角,这样就仅仅有四…

time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output As we all know, Max is the best video game player among her friends. Her friends were so jealous of hers, that they created an actual game ju…

链接 Codeforces 667C Reberland Linguistics 题意 给你一个字符串,除去前5个字符串后,使剩下的串有长度为2或3的词根组成,相邻的词根不能重复.找到所有的词根 思路 去掉前5个字符,将剩下的串反过来进行记忆化,用vis[last][pos]记录一下当前状态是否做过.last是之前与之相邻的词根.比赛的时候只用了vis[i]错了. 代码 #include <iostream> #include <cstdio> #include <vecto…

可以用三维dp来保存状态, dp[i][j][k]表示在前i个字符变换了j步之后方向为k(k = 1 or k = 0)的最优解,也就是离原点的最大距离.这里规定0方向为正方向,1位负方向,表示的是当前这个人朝哪个方向.这两个方向是对立的. 所以就可以递推一个关系式,分第i个字符为'F' or 'T'时 如果为'F' 依次枚举在第i个位置变换了几步,这是枚举的范围为0~j, 假设变换了k步(和上面的dp[i][j][k]当中的k不是一个) 1. 如果当k为奇数的时候,就是相当于变化了1步,所以'…

虽然不是正解但毕竟自己做出来了还是记下来吧- 对每个人分别dfs得到其期望,某两维的组合情况有限所以Hash一下避免了MLE. #include <cstdio> #include <cstring> #include <iostream> #include <algorithm> #include <unordered_map> using namespace std; const int maxn = 51, mod = 998244353;…

Voracious Steve 题目连接: http://codeforces.com/gym/100231/attachments Description 有两个人在玩一个游戏 有一个盆子里面有n个甜甜圈,A先开始,他可以抓[1,min(m,n)]颗甜甜圈,然后B开始,同样,可以抓[1,min(n,m)]个甜甜圈 谁抓完的,就可以把自己抓的吃完,然后另外一个人就把他的甜甜圈扔进去,然后由失败的那个人开始 问你第一个人最多能吃到多少个甜甜圈 Input 2个整数 n,m 表示一开始有n个甜甜圈,…

D. Zuma 题目连接: http://www.codeforces.com/contest/608/problem/D Description Genos recently installed the game Zuma on his phone. In Zuma there exists a line of n gemstones, the i-th of which has color ci. The goal of the game is to destroy all the gems…

E. Chocolate Bar Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/598/problem/E Description You have a rectangular chocolate bar consisting of n × m single squares. You want to eat exactly k squares, so you may need to break…