汇率转换问题: 怎么样才能套利 可以用Floyd算法: #include<bits/stdc++.h> using namespace std; ][]; int main() { int n,m; map<; ,n) { string ss; ;i<=n;i++) { cin>>ss; ma[ss]=i; } string s1,s2;double rate; ;i<=n;i++) ;j<=n;j++) { ; ; } scanf("%d&quo…

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 pound buys…

题目大意: 给你几种货币,以及几种汇率关系,问是否存在套利的可能? 思路: 初步想法:图上存在一个环的路径上权值相乘大于1.... 再者:该如何找到图上所有环呢.... 好吧 经过鸟神 和 况神的指点,,,这题就是一道floyed求最小环而已(权重取负)(虽然差不多,其实还是差挺远..) 对于乘法处理转换为ln...Orz一下鸟神 Floyed求最小环(后来才发现没关系) 一开始天真的以为.....只要求一遍Floyed 再判断一下F[i][i]就好,但要记住这个图是带负权值的....所以可能是…

题目链接 http://acm.hdu.edu.cn/showproblem.php?pid=1217 题目大意 在每种钱币间进行各种交换,最后换回自己如果能赚,那么就Yes,否则No 注意应为有负权所以dijsktra在这里行不通了可以用国产的spfa算法,可比bfs. 我的AC代码 #include<iostream>#include<cstdio>#include<cstring>#include<map>#include<queue>us…

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…

Time Limit: 1000 MS Memory Limit: 65536 KB 64-bit integer IO format: %I64d , %I64u   Java class name: Main [Submit] [Status] [Discuss] Description Arbitrage is the use of discrepancies in currency exchange rates to transform one unit of a currency in…

题目来源:https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=3&page=show_problem&problem=40  Arbitrage  Background The use of computers in the finance industry has been marked with controversy lately as programmed tr…

Arbitrage Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 16652   Accepted: 7004 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…

题目传送门 /* 最短路:Floyd模板题 只要把+改为*就ok了,热闹后判断d[i][i]是否大于1 文件输入的ONLINE_JUDGE少写了个_,WA了N遍:) */ #include <cstdio> #include <iostream> #include <cstring> #include <algorithm> #include <string> #include <map> #include <cmath>…

Arbitrage Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 15640   Accepted: 6563 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…