Watchcow Time Limit: 3000MS Memory Limit: 65536K Total Submissions: 6172Accepted: 2663 Special Judge Description Bessie's been appointed the new watch-cow for the farm. Every night, it's her job to walk across the farm and make sure that no evildoers…

题目链接:http://poj.org/problem?id=2230 题目: 题意:给你m条路径,求一条路径使得从1出发最后回到1,并满足每条路径都恰好被沿着正反两个方向经过一次. 思路:由于可以回到起点,并且题目保证有解,所以本题是欧拉回路.输出路径有两种方法,一种是递归实现,一种是用栈处理,不过两种速度差了1s,不知道是不是我递归没处理好~ 代码实现如下(第一种为栈输出路径,对应797ms,第二种为递归,对应1782ms): #include <set> #include <map…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4392 题目大意: 一个图,要将每条边恰好遍历两遍,而且要以不同的方向,还要回到原点. dfs解法                   借鉴于->大佬博客 #include <iostream> #include <vector> #include <algorithm> using namespace std; #define arrsize 10001 int n,…

Watchcow Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 6477   Accepted: 2823   Special Judge Description Bessie's been appointed the new watch-cow for the farm. Every night, it's her job to walk across the farm and make sure that no ev…

Watchcow Time Limit: 3000MS Memory Limit: 65536K Total Submissions: 9974 Accepted: 4307 Special Judge Description Bessie's been appointed the new watch-cow for the farm. Every night, it's her job to walk across the farm and make sure that no evildoer…

原题链接 类欧拉回路,要求每条边被正反各经过一次,且从\(1\)出发并回到\(1\). 只需每次搜索该点的边时,将该点的边对应的邻接表头及时修改为下一条即可,因为邻接表恰好储存了正反方向的边,所以及时更新表头就能保证每条边被正反各经过一次. #include<cstdio> using namespace std; const int N = 1e4 + 10; const int M = 5e4 + 10; int fi[N], di[M << 1], ne[M <<…

Watchcow Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 7473   Accepted: 3270   Special Judge Description Bessie's been appointed the new watch-cow for the farm. Every night, it's her job to walk across the farm and make sure that no ev…

转自:http://blog.csdn.net/shahdza/article/details/7779385 欧拉回路[HDU]1878 欧拉回路 判断3018 Ant Trip 一笔画问题1116 Play on Words2894 DeBruijin 兹鼓欧拉回路1956 Sightseeing tour 混合欧拉3472 HS BDC 混合欧拉=========================================================================…

转自——http://blog.csdn.net/qwe20060514/article/details/8112550 =============================以下是最小生成树+并查集======================================[HDU]1213   How Many Tables   基础并查集★1272   小希的迷宫   基础并查集★1325&&poj1308  Is It A Tree?   基础并查集★1856   More i…

竟然生日前一天poj破百,不错不错,加速前进! poj2437 由于泥泞不重叠,所以按其实左边排个序再统计一遍即可(如果不是刚好盖满就尽量往后盖) poj2435 细节bfs poj2230 求欧拉回路,dfs即可 poj1330 简单的LCA poj2458 傻×穷举 poj2459 模拟水题 poj3044 纯的单调队列,还真是少见 poj3045 按w+s排序,然后统计一遍就行了,注意风险可以是负的…… poj1952 计数的LIS,值得注意的是不同位置的相同序列算一次,加个判断即可 po…