题目链接:http://www.lightoj.com/volume_showproblem.php?problem=1173 题解:像这种题目显然可以想到n为几时一共有几种排列可以递推出来.然后就是对m的考虑如果m只能在第一位那么显然需要的组合是先下降后上升的如果m不在第一位那么需要的组合是先上升后下降的.于是便可以想到设dp_in[i][j]表示i个数第j个数放在第一个而且是先上升后下降的一共有几种方法,dp_de[i][j]表示i个数第j个数放在第一个而且是先下降后上升的有几种方法. dp…

题目大意:n个不同身高的队员和教练的按照身高排成波浪形……每个人按照身高由低到高编号,其中第m个是教练,他必须在第一个,如果条件允许,排第二的要比m低,如果条件不允许,即其余人都比教练高,则要让差距尽可能小,求排队方案数. 题目思路: dp_up[i][j],代表i个人排队,第j个人排在队首,且第二个人小于第一个人的方案数 dp-down[i][j],代表i个人排队,第j个人排在队首,且第二个人大于第一个人的方案数 那么dp_up[i][j] = Sum(dp_down[i-1][j]),因为要…

链接: https://vjudge.net/problem/LightOJ-1173 题意: The coach of a football team, after suffering for years the adverse comments of the media about his tactics, decides to take his revenge by presenting his players in a line-up in such a way that the TV…

Description Misha trains several ACM teams at the university. He is an experienced coach, and he does not underestimate the meaning of friendly and collaborative atmosphere during training sessions. It used to be that way, but one of the teams happen…

B. Coach 题目连接: http://www.codeforces.com/contest/300/problem/A Description A programming coach has n students to teach. We know that n is divisible by 3. Let's assume that all students are numbered from 1 to n, inclusive. Before the university progra…

1173 最优贸易 2009年NOIP全国联赛提高组 时间限制: 1 s 空间限制: 128000 KB 题目等级 : 钻石 Diamond 题目描述 Description [问题描述] C 国有n 个大城市和m 条道路,每条道路连接这n 个城市中的某两个城市.任意两个城市之间最多只有一条道路直接相连.这m 条道路中有一部分为单向通行的道路,一部分为双向通行的道路,双向通行的道路在统计条数时也计为1 条. C 国幅员辽阔,各地的资源分布情况各不相同,这就导致了同一种商品在不同城市的价格不一定相…

Description A programming coach has n students to teach. We know that n is divisible by 3. Let's assume that all students are numbered from 1 to n, inclusive. Before the university programming championship the coach wants to split all students into g…

轻奢品牌全面崛起 Coach.UGG等纷纷抢滩新兴市场_新闻中心_赢商网 轻奢品牌全面崛起 Coach.UGG等纷纷抢滩新兴市场…

1173: 这是物理学的奇迹!! 题目描述 goagain在做物理电学实验时需要一个2Ω的电阻,但是他发现他的实验台上只剩下了3Ω,4Ω,5Ω,6Ω的电阻若干,于是goagain把两个4Ω的电阻并联起来,发现效果也不错,于是他惊呼,这是物理学的奇迹!! 实验结束之后goagain思考了一下,其实用1个3Ω的电阻和一个6Ω的电阻并联一下也是不错的,但是似乎没有其他的方法可以并联两个电阻得到等效的2Ω电阻了. goagain就想啊,如果我需要一个k Ω的电阻,但是我的手头上只有k+1 Ω,k+2 Ω…

Problem 1124 - Football Coach Description It is not an easy job to be a coach of a football team. The season is almost over, only a few matches are left to play. All of sudden the team manager comes to you and tells you bad news: the main sponsor of…