POJ 1860 Currency Exchange / ZOJ 1544 Currency Exchange (最短路径相关,spfa求环) Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and performs exchange operations onl…

Currency Exchange Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 60000/30000K (Java/Other) Total Submission(s) : 4   Accepted Submission(s) : 2 Problem Description Several currency exchange points are working in our city. Let us suppose that…

Currency Exchange 题目链接: http://acm.hust.edu.cn/vjudge/contest/122685#problem/E Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and performs exchange operati…

Arbitrage Time Limit: 1000MS   Memory Limit: 65536K Total Submissions:27167   Accepted: 11440 Description Arbitrage is the use of discrepancies in currency exchange rates to transform one unit of a currency into more than one unit of the same currenc…

poj—— 1860 Currency Exchange Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 29851   Accepted: 11245 Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular curre…

链接:http://poj.org/problem?id=1860 Currency Exchange Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and performs exchange operations only with these currenc…

Currency Exchange Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 21349   Accepted: 7653 Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and pe…

题目链接: https://cn.vjudge.net/problem/POJ-1860 Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and performs exchange operations only with these currencies. There can be s…

Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and performs exchange operations only with these currencies. There can be several points specializing in the same pair o…

传送门:点击打开链接 题目大意:一个城市有n种货币,m个货币交换点,你有v的钱,每个交换点只能交换两种货币,(A换B或者B换A),每一次交换都有独特的汇率和手续费,问你存不存在一种换法使原来的钱更多. 思路:一开始以为一个地方只能用一次,感觉好像有点难,后来发现自己读错题了,其实只要判断给你的这幅图存不存在正环就可以了,用dis[]表示某种货币的数量,然后bellman判断正环就可以了.(题目里强调结尾一定要原来的货币,但其实这是废话,因为是以原来的货币为起点的,所以你换出去了一定换的回来),正…