HDU 4280 Island Transport(网络流,最大流) Description In the vast waters far far away, there are many islands. People are living on the islands, and all the transport among the islands relies on the ships. You have a transportation company there. Some route…

Island Transport Time Limit: 20000/10000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 6217    Accepted Submission(s): 1965 Problem Description In the vast waters far far away, there are many islands. People are l…

HDU 4280:http://acm.hdu.edu.cn/showproblem.php?pid=4280 题意: 比较裸的最大流题目,就是这是个无向图,并且比较卡时间. 思路: 是这样的,由于是无向图,所以addedge 的反边容量直接设为原始流量.然后还可以优化搜索的方向,bfs可以从t到s跑,dfs可以从s到t跑,这样快. //#pragma GCC optimize(3) //#pragma comment(linker, "/STACK:102400000,102400000&qu…

Island Transport Time Limit: 10000ms Memory Limit: 65536KB This problem will be judged on HDU. Original ID: 4280 64-bit integer IO format: %I64d      Java class name: Main In the vast waters far far away, there are many islands. People are living on…

Island Transport Description In the vast waters far far away, there are many islands. People are living on the islands, and all the transport among the islands relies on the ships. You have a transportation company there. Some routes are opened for p…

转载请注明出处:http://blog.csdn.net/u012860063 题目链接:pid=4280">http://acm.hdu.edu.cn/showproblem.php?pid=4280 Problem Description In the vast waters far far away, there are many islands. People are living on the islands, and all the transport among the is…

题意: 求最大流 思路: \(1e5\)条边,偷了一个超长的\(HLPP\)板子.复杂度\(n^2 \sqrt{m}\).但通常在随机情况下并没有isap快. 板子: template<class T = int> struct HLPP{ const int MAXN = 1e5 + 5; const T INF = 0x3f3f3f3f; struct edge{ int to, rev; T f; }; vector<edge> adj[maxn]; deque<int…

Island Transport Time Limit: 20000/10000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 9473    Accepted Submission(s): 3069 Problem Description In the vast waters far far away, there are many islands. People are li…

题目链接:https://vjudge.net/problem/HDU-4280 Island Transport Time Limit: 20000/10000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 9945    Accepted Submission(s): 3214 Problem Description In the vast waters far far aw…

题目链接 可以说是真的把时间卡爆了,不断的修改了好多次之后才A了,一直T一直T,哭了…… 可以说是很练时间优化了,不断的改,不断的提交,最后竟然是改了Dinic中的BFS()中,我们一旦搜索到了T之后就是直接break掉,就可以过了.还有一个优化就是在Dinic上面需要加当前弧优化操作才可以,另外不知道改出来的手动队列到最后有没有派上用处. #pragma comment(linker, "/STACK:1024000000,1024000000") #include <iost…