3396: [Usaco2009 Jan]Total flow 水流 Time Limit: 1 Sec  Memory Limit: 128 MBSubmit: 179  Solved: 73[Submit][Status] Description   Input 第1行输入N,之后N行每行描述一条水管,前两个英文字母表示水管的两端(大小写字母是不一样的),后一个整数表示水管的流量,流量不会超过1000. Output 一个整数,表示总流量． Sample Input 5 A B 3 B C…

http://www.lydsy.com/JudgeOnline/problem.php?id=3396 裸的最大流跑过.. #include <cstdio> #include <cstring> #include <cmath> #include <string> #include <iostream> #include <algorithm> #include <queue> using namespace std;…

最大流生动形象的板子,注意数组开大点 #include<iostream> #include<cstdio> #include<queue> #include<cstring> using namespace std; const int N=100,inf=1e9; int n=26,m,h[N],cnt=1,s=1,t=26,le[N],x; char s1[5],s2[5]; struct qwe { int ne,to,va; }e[N*N*2];…

3396: [Usaco2009 Jan]Total flow 水流 Time Limit: 1 Sec  Memory Limit: 128 MBSubmit: 45  Solved: 27[Submit][Status] Description   Input 第1行输入N,之后N行每行描述一条水管,前两个英文字母表示水管的两端(大小写字母是不一样的),后一个整数表示水管的流量,流量不会超过1000. Output 一个整数,表示总流量． Sample Input 5 A B 3 B C 3…

#include<cstdio> #include<cstring> #include<algorithm> #include<queue> using namespace std; #define INF 2147483647 #define MAXN 201 #define MAXM 1501 int v[MAXM],cap[MAXM],en,first[MAXN],next[MAXM]; int d[MAXN],cur[MAXN]; queue<…

1576: [Usaco2009 Jan]安全路经Travel Time Limit: 10 Sec  Memory Limit: 64 MB Submit: 665  Solved: 227[Submit][Status] Description Input * 第一行: 两个空格分开的数, N和M * 第2..M+1行: 三个空格分开的数a_i, b_i,和t_i Output * 第1..N-1行: 第i行包含一个数:从牛棚_1到牛棚_i+1并且避免从牛棚1到牛棚i+1最短路经上最后一条牛…

3394: [Usaco2009 Jan]Best Spot 最佳牧场 Time Limit: 1 Sec  Memory Limit: 128 MBSubmit: 11  Solved: 9[Submit][Status] Description   Input 第1行输入三个整数P,F C.之后F行每行输入一个整数表示一个贝茜喜欢的牧场．之后C行每行输入三个整数ai,bi,Ti,描述一条路． Output 一个整数,满足题目要求的最佳牧场．如果有多个答案,输出编号最小的 Sample Inp…

1574: [Usaco2009 Jan]地震损坏Damage Time Limit: 10 Sec  Memory Limit: 64 MBSubmit: 425  Solved: 232[Submit][Status][Discuss] Description 农夫John的农场遭受了一场地震.有一些牛棚遭到了损坏,但幸运地,所有牛棚间的路经都还能使用. FJ的农场有P(1 <= P <= 30,000)个牛棚,编号1..P. C(1 <= C <= 100,000)条双向路经…

P2936 [USACO09JAN]全流Total Flow 题目描述 Farmer John always wants his cows to have enough water and thus has made a map of the N (1 <= N <= 700) water pipes on the farm that connect the well to the barn. He was surprised to find a wild mess of different…

题目描述 Farmer John always wants his cows to have enough water and thus has made a map of the N (1 <= N <= 700) water pipes on the farm that connect the well to the barn. He was surprised to find a wild mess of different size pipes connected in an appa…