Bellman_ford算法用于寻找正环或者负环! 算法导论: 24.1 The Bellman-Ford algorithm The Bellman-Ford algorithm solves the single-source shortest-paths problem in the general case in which edge weights may be negative. Given a weighted, directed graph G = (V, E) with sou…

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 currencies. There can be several points specializing in the…

Currency Exchange DescriptionSeveral 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 sp…

题目链接:http://poj.org/problem?id=1860 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 currencies. There can b…

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…

Currency Exchange Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 22123   Accepted: 7990 Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and pe…

链接: http://poj.org/problem?id=1860 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=22010#problem/A Currency Exchange Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 16244   Accepted: 5656 Description Several currency exchange point…

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…

题目传送门 /* 最短路(Bellman_Ford):求负环的思路,但是反过来用,即找正环 详细解释:http://blog.csdn.net/lyy289065406/article/details/6645778 */ #include <cstdio> #include <iostream> #include <algorithm> #include <cstring> #include <vector> #include <cmat…

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…

http://poj.org/problem?id=1860 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 currencies. There can be sev…

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 currencies. There can be several points specializing in the…

题目链接:http://poj.org/problem?id=1860 Currency Exchange Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 32128   Accepted: 12228 Description Several currency exchange points are working in our city. Let us suppose that each point specialize…

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…

三道题都是考察最短路算法的判环.其中1860和2240判断正环,3259判断负环. 难度都不大,可以使用Bellman-ford算法,或者SPFA算法.也有用弗洛伊德算法的,笔者还不会SF-_-…… 直接贴代码. 1860 Currency Exchange: #include <cstdio> #include <cstring> int N,M,S; double V; ; int first[maxn],vv[maxn*maxn],nxt[maxn*maxn]; double…

题目链接:POJ 1860 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 currencies. There can be several points speci…

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…

Currency Exchange Time Limit: 1000MS Memory Limit: 30000K Total Submissions: 22180 Accepted: 8015 Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and perfor…

点击打开链接 Currency Exchange Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 16635   Accepted: 5821 Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies…

Currency Exchange Time Limit:1000MS     Memory Limit:30000KB     64bit IO Format:%I64d & %I64u Submit Status Practice POJ 1860 Appoint description:  System Crawler  (2015-05-14) Description Several currency exchange points are working in our city. Le…

Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 16456   Accepted: 5732 Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and performs exchange op…

来源poj1860 everal 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 sa…

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…

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 currencies. There can be several points specializing in the…

Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 22111   Accepted: 7986 Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and performs exchange op…

原题链接:http://poj.org/problem?id=1860 Currency Exchange Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 23055   Accepted: 8328 Description Several currency exchange points are working in our city. Let us suppose that each point specializes…

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…

Currency Exchange POJ - 1860 题意: 有许多货币兑换点,每个兑换点仅支持两种货币的兑换,兑换有相应的汇率和手续费.你有s这个货币 V 个,问是否能通过合理地兑换货币,使得你手中的货币折合成s后是有增加的. 思路: 这道题在建立每种货币的兑换关系后,找到图中的正环即可,因为你沿着正环跑就可以增加价值.这里可以用类似Bellman_Ford判断负环的方法. #include <algorithm> #include <iterator> #include &…

题目链接:https://vjudge.net/problem/POJ-1860 大致题意:有不同的货币,有很多货币交换点,每个货币交换点只能两种货币相互交换,有佣金C,汇率R. 每次交换算一次操作,问能不能经过一系列操作使得本来的货币的本金数额变大. 思路:相当于图,“一系列操作使得本金数额变大”说明有一个正的回路,能使得某种货币的数额增大,那么, 只要有这一个正的回路,那么我们一定可以让某种货币的数额变为无穷大,那么本来的货币的本金数额变大是一定的, 所有,我们只需要判断图中是否出现了一个正…

Currency Exchange Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 22648   Accepted: 8180 Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and pe…