正权专题
Bellman_Ford变形求最长路+正权回路或spfa——POJ 1860
对应POJ题目：点击打开链接 Currency Exchange Time Limit: 1000MS Memory Limit: 30000KTotal Submissions: 20814 Accepted: 7451 Description Several currency exchange points are working in our city. L
POJ1860 Currency Exchange(正权环，folyd)
题目： Currency Exchange Time Limit: 1000MS Memory Limit: 30000KTotal Submissions: 28540 Accepted: 10657 Description Several currency exchange points are working in our city. Let us suppose that