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Destroy Transportation systemTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 1022 Accepted Submission(s): 512 Problem Description Tom is a commander, his task is destroying his enemy¡¯s transportation system. Let¡¯s represent his enemy¡¯s transportation system as a simple directed graph G with n nodes and m edges. Each node is a city and each directed edge is a directed road. Each edge from node u to node v is associated with two values D and B, D is the cost to destroy/remove such edge, B is the cost to build an undirected edge between u and v. His enemy can deliver supplies from city u to city v if and only if there is a directed path from u to v. At first they can deliver supplies from any city to any other cities. So the graph is a strongly-connected graph. He will choose a non-empty proper subset of cities, let¡¯s denote this set as S. Let¡¯s denote the complement set of S as T. He will command his soldiers to destroy all the edges (u, v) that u belongs to set S and v belongs to set T. To destroy an edge, he must pay the related cost D. The total cost he will pay is X. You can use this formula to calculate X: After that, all the edges from S to T are destroyed. In order to deliver huge number of supplies from S to T, his enemy will change all the remained directed edges (u, v) that u belongs to set T and v belongs to set S into undirected edges. (Surely, those edges exist because the original graph is strongly-connected) To change an edge, they must remove the original directed edge at first, whose cost is D, then they have to build a new undirected edge, whose cost is B. The total cost they will pay is Y. You can use this formula to calculate Y: At last, if Y>=X, Tom will achieve his goal. But Tom is so lazy that he is unwilling to take a cup of time to choose a set S to make Y>=X, he hope to choose set S randomly! So he asks you if there is a set S, such that Y<X. If such set exists, he will feel unhappy, because he must choose set S carefully, otherwise he will become very happy. Input There are multiply test cases. The first line contains an integer T(T<=200), indicates the number of cases. For each test case, the first line has two numbers n and m. Next m lines describe each edge. Each line has four numbers u, v, D, B. (2=<n<=200, 2=<m<=5000, 1=<u, v<=n, 0=<D, B<=100000) The meaning of all characters are described above. It is guaranteed that the input graph is strongly-connected. Output For each case, output "Case #X: " first, X is the case number starting from 1.If such set doesn¡¯t exist, print ¡°happy¡±, else print ¡°unhappy¡±. Sample Input
Sample Output
Hint In first sample, for any set S, X=2, Y=4. In second sample. S= {1}, T= {2, 3}, X=10, Y=4. Author UESTC Source | ||||||||||
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