[题意](小紫书)一个人从站台1出发,乘车要在时刻T到达站台n,为使在站台等车时间最短,她可以选择乘坐两个方向的列车,并在客车停靠站的时候换车. [分析]每次停站下车时,她都有三种选择,1.原地不动 2.搭乘向右的车 3.搭乘向左的车.d[i][j]表示在站台i,时刻j的最小等待时间. 状态转移方程: 等待:dp[i][j]=dp[i][j+1]+1; 如果有向右的车:  dp[i][j]=min(dp[i][j],dp[i+1][j+t[i]]); 如果有向左的车: dp[i][j]=min(…

A Spy in the Metro Secret agent Maria was sent to Algorithms City to carry out an especially dangerous mission. After several thrilling events we nd her in the rst station of Algorithms City Metro, examining the time table. The Algorithms City Metro…

点击打开题目 题目大意: 在一个有n个站台的地铁线路里,给你列车通向每相邻两个车站所花费的时间,从0时刻开始,从1号站出发,要在T这个时间点上,到达n号站,给你m1辆从1开到n的列车及其出发时间,和m2辆从n开到1的列车及其出发时间,求在车站停留的最短时间(注意,如果你在T之前的T'时到达n号站,那你也要花费T-T'的时间停留),如果无论如何也到不了n号站,输出"Impossible" 设f[i][j]表示在第i时刻到达j号车站,将每辆列车到每个站的时间预处理一下,则状态转移方程为:…

UVA - 1025 A Spy in the Metro Secret agent Maria was sent to Algorithms City to carry out an especially dangerous mission. After several thrilling events we find her in the first station of Algorithms City Metro, examining the time table. The Algorit…

A Spy in the Metro Time Limit: 3000MS     64bit IO Format: %lld & %llu Submit Status uDebug Secret agent Maria was sent to Algorithms City to carry out an especially dangerous mission. After several thrilling events we find her in the first station o…

 UVA 1025 -- A Spy in the Metro  题意:  一个间谍要从第一个车站到第n个车站去会见另一个,在是期间有n个车站,有来回的车站,让你在时间T内时到达n,并且等车时间最短,输出最短等车时间. 思路:  先用一个has_train[t][i][0]来表示在t时刻,在车站i,是否有往右开的车.同理,has_train[t][i][1]用来保存是否有往左开的车. 用d(i,j)表示时刻i,你在车站j,最少还需要等待多长时间.边界条件是d(T,n)=0,其他d(T,i)为正无…

洛谷2583 地铁间谍(UVa1025A Spy in the Metro) 本题地址:http://www.luogu.org/problem/show?pid=2583 题目描述 特工玛利亚被送到S市执行一个特别危险的任务.她需要利用地铁完成他的任务,S市的地铁只有一条线路运行,所以并不复杂. 玛利亚有一个任务,现在的时间为0,她要从第一个站出发,并在最后一站的间谍碰头.玛利亚知道有一个强大的组织正在追踪她,她知道如果一直呆在一个车 站,她会有很大的被抓的风险,躲在运行的列车中是比较安全的.…

Problem UVA1025-A Spy in the Metro Accept: 713  Submit: 6160Time Limit: 3000 mSec Problem Description Input  Output For each test case, print a line containing the case number (starting with 1) and an integer representing the total waiting time in th…

传送门 Description Secret agent Maria was sent to Algorithms City to carry out an especially dangerous mission. After several thrilling events we find her in the first station of Algorithms City Metro, examining the time table. The Algorithms City Metro…

Secret agent Maria was sent to Algorithms City to carry out an especially dangerous mission. After several thrilling events we find her in the first station of Algorithms City Metro, examining the time table. The Algorithms City Metro consists of a s…