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考虑不断找到以下两种类型的边,并维护答案: 1.终点出度为0的边,那么此时即令$ans_{x}=\min(ans_{x},\max(r,ans_{y}-p))$​ 2.(在没有"终点出度为0的边时",即优先删除第1类边)剩余边中$r$​​​​最大的边,注意到能走到的每一个点都有出边,且其限制$r$​​都更小,那么即可令$ans_{x}=\min(ans_{x},r)$​ 进一步的,在维护答案后,注意到如果答案比该限制小,那么一定可以不用这条边,因此删去该边即可 关于此过程的维护,维护一…
Travelling Salesman   After leaving Yemen, Bahosain now works as a salesman in Jordan. He spends most of his time travelling between different cities. He decided to buy a new car to help him in his job, but he has to decide about the capacity of the…
After leaving Yemen, Bahosain now works as a salesman in Jordan. He spends most of his time travelling between different cities. He decided to buy a new car to help him in his job, but he has to decide about the capacity of the fuel tank. The new car…
The merchant Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 4556   Accepted: 1576 Description There are N cities in a country, and there is one and only one simple path between each pair of cities. A merchant has chosen some paths and w…
传送门 Time Limit: 3000MS Memory Limit: 65536K Description There are N cities in a country, and there is one and only one simple path between each pair of cities. A merchant has chosen some paths and wants to earn as much money as possible in each path.…
Travelling Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2554    Accepted Submission(s): 746 Problem DescriptionAfter coding so many days,Mr Acmer wants to have a good rest.So travelling is th…
Travelling Tours Time limit: 1.0 secondMemory limit: 64 MB There are N cities numbered from 1 to N (1 ≤ N ≤ 200) and M two-way roads connect them. There are at most one road between two cities. In summer holiday, members of DSAP Group want to make so…
http://acm.hdu.edu.cn/showproblem.php?pid=3001 从任何一个点出发,去到达所有的点,但每个点只能到达2次,使用的经费最小.三进制 Travelling Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3541    Accepted Submission(s): 1106 Problem Des…
1616: [Usaco2008 Mar]Cow Travelling游荡的奶牛 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 1006  Solved: 548[Submit][Status][Discuss] Description 奶牛们在被划分成N行M列(2 <= N <= 100; 2 <= M <= 100)的草地上游走,试图找到整块草地中最美味的牧草.Farmer John在某个时刻看见贝茜在位置 (R1, C1),恰好T…
1616: [Usaco2008 Mar]Cow Travelling游荡的奶牛 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 762  Solved: 427[Submit][Status] Description 奶牛们在被划分成N行M列(2 <= N <= 100; 2 <= M <= 100)的草地上游走,试图找到整块草地中最美味的牧草.Farmer John在某个时刻看见贝茜在位置 (R1, C1),恰好T (0 < T…