B. Food on the Plane time limit per test:2 seconds memory limit per test:256 megabytes input:standard input output:standard output A new airplane SuperPuperJet has an infinite number of rows, numbered with positive integers starting with 1 from cockp…

题目链接: E. Points on Plane time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output On a plane are n points (xi, yi) with integer coordinates between 0 and 106. The distance between the two points wi…

CodeForces 725A: 思路就是如果"最左"不是'>'这个了,那么这个右边的一定不可能到达左边了: 同理最右: CodeForces 725B: 有两个空姐,一个从第1行开始照顾1,2两行:另一个从第二行开始照顾3,4两行,对每个乘客,给他东西需要1个单位时间,换一行需要一个单位时间:然后两个空姐同时处理,对每一行都是fed,abc,然后换行,两个空姐同时处理完两行以后,跳两行继续处理: 思路: 我就是先把处理了几个乘客算出来,然后再计算一个跨越时间: CodeForc…

B. Plane of Tanks: Pro Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/175/problem/B Description Vasya has been playing Plane of Tanks with his friends the whole year. Now it is time to divide the participants into several…

C. Points on Plane Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/576/problem/C Description On a plane are n points (xi, yi) with integer coordinates between 0 and 106. The distance between the two points with numbers a and…

http://codeforces.com/problemset/problem/175/D (题目链接) 题意 A,B两人玩坦克大战,坦克有生命值,射击间隔,伤害范围,未命中的概率.问A赢的概率是多少. Solution 直接做并不好做,注意到精度要求只有$10^{-4}$,也就是说当射击次数达到一定上限之后,满足了精度要求我们就可以不做了.我们考虑按照时间dp.怎么设计状态呢,如果$f[i][j]$表示A还剩$i$点生命值,B还剩$j$点生命值,这样复杂度太高了,我们考虑将A和B剩余生命分开…

[题目]C. Points on Plane [题意]给定坐标系中n个点的坐标(范围[0,10^6]),求一种 [ 连边形成链后总长度<=2.5*10^9 ] 的方案.n<=10^6. [算法]思维题(分块思想) [题解]将这个10^6*10^6的矩阵划分为1000个10^3*10^6的矩阵,第奇数个矩阵内部按y升序连边,第偶数个矩阵内部按y降序连边,两个矩阵之间就直接连边. 1.到达每个点横坐标要移动10^3,总距离10^9. 2.每个矩阵内部纵坐标要移动10^6,总距离10^9. 3.矩阵…

Points on Plane Problem's Link Mean: 在二维坐标中给定n个点,求一条哈密顿通路. analyse: 一开始忽略了“无需保证路径最短”这个条件,一直在套最短哈密顿通路的模板,无限TLE. 简单的构造,首先对x坐标设一个阀值,分段输出,从下到上.再从上到下.在从下到上...直到所有点输出完为止. 当然也可横向扫描输出. Time complexity: O(N) Source code:  ;;;;)                  ;}…

题目描述 On a plane are nn points ( x_{i}xi​ , y_{i}yi​ ) with integer coordinates between 00 and 10^{6}106 . The distance between the two points with numbers aa and bb is said to be the following value:  (the distance calculated by such formula is calle…

                                                                          C. Points on Plane On a plane are n points (xi, yi) with integer coordinates between 0 and 106. The distance between the two points with numbers a and bis said to be the follow…