Arbitrage Problem 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 currency. For example, suppose that 1 US Dollar buys 0.5 British pound, 1 British p…

Wormholes Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 29971   Accepted: 10844 Description While exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way p…

POJ 2240 Arbitrage / ZOJ 1092 Arbitrage / HDU 1217 Arbitrage / SPOJ Arbitrage(图论,环) 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 currency. For exa…

POJ1860 题目大意:你在某一点有一些钱,给定你两点之间钱得兑换规则,问你有没有办法使你手里的钱增多.就是想看看转一圈我的钱能不能增多,出现这一点得条件就是有兑换钱得正权回路,所以选择用bellman_ford得算法 准备工作,bellman_ford得更新是根据已知边得数据来的,所以需要存住边的数据,还要有dis数组作为更新判断,dis也就相当于中心节点得钱兑换到i节点(中间可能会经过别的)变成了多少钱 #include <iostream> #include <string.h&…

Arbitrage http://acm.hdu.edu.cn/showproblem.php?pid=1217 Problem 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 currency. For example, suppose that…

题目:http://acm.hdu.edu.cn/showproblem.php?pid=1217 /************************************************************************/ /* hdu Arbitrage floyd求最短路径 题目大意:floyd算法,求得两点之间最短距离,(u,v) = min( (u,v),(u,w)+(w,v) ); 此题,是求其能够赚钱,即最大生成树,且过程是相乘的,公式:( u, v) =…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1217 题目大意:问你是否可以通过转换货币从中获利 如下面这组样例: USDollar 0.5 BritishPound BritishPound 10.0 FrenchFranc FrenchFranc 0.21 USDollar 可以通过US->Br->French->US这样转换,把1美元变成1*0.5*10*0.21=1.05美元赚取%5的利润. 解题思路:其实就相当于bellman-…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1217 题目大意:通过货币的转换,来判断是否获利,如果获利则输出Yes,否则输出No. 这里介绍一个STL中的map容器去处理数据,map<string,int>V,M; 现在我目前的理解是将字符串转换成数字,然后就是根据spfa的模板找最短路了..哇哈哈( ⊙o⊙ )哇 #include <iostream> #include <cstdio> #include <m…

在Bellman-Ford算法之后,我们总算迎来了spfa算法,其实就如同堆优化Dijkstra算法之于朴素版Dijkstra算法,spfa算法仅仅是对Bellman-Ford算法的一种优化,但是在形式上,它看起来特别像堆优化Dijkstra算法罢了! Bellman-Ford算法会遍历所有边并进行松弛操作,然而我们应该知道很多的更新是无用的,所以我们的优化就体现在这里,因为只有那些前一步被更新的点,它所连接的点才有被更新的意义,所以我们会将被更新的点放入一个队列中: 注意点: 1) st数组的…

Arbitrage Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 6360    Accepted Submission(s): 2939 Problem Description Arbitrage is the use of discrepancies in currency exchange rates to transform o…