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poj 2481 cows
题目大意: 有一些集合,求每个集合是多少个集合的真子集 思路: 树状数组 先按照右端点从大到小排序,这样只要考虑之前比它左端点小的出现过几次就可以了 模板题 #include<iostream> #include<cstdio> #include<cmath> #include<algorithm> ...
分类:其他好文   时间:2017-07-23 10:12:03    阅读次数:160
POJ-1986 Distance Queries
Distance Queries Time Limit: 2000MS Memory Limit: 30000K Total Submissions: 13987 Accepted: 4924 Case Time Limit: 1000MS Description Farmer John's cow ...
分类:其他好文   时间:2017-07-22 12:05:14    阅读次数:196
流畅python学习笔记:第十一章:抽象基类
从输出结果可以看到,通过for d in deck迭代的方式也能遍历整个_card数组。迭代器环境会先尝试__iter__方法,在尝试__getitem__.也就是如果对象不支持迭代协议,就会尝试索引运算。迭代环境是通过调用内置函数iter去尝试__iter__方法来实现的,这种方法返回一个迭代器对 ...
分类:编程语言   时间:2017-07-22 12:00:13    阅读次数:173
poj 3268 Silver Cow Party
Silver Cow Party Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 22580 Accepted: 10333 Description One cow from each of N farms (1 ≤ N ≤ 10 ...
分类:其他好文   时间:2017-07-21 17:22:27    阅读次数:218
BZOJ 3363 POJ 1985 Cow Marathon 树的直径
题目大意:给出一棵树。求两点间的最长距离。 思路:裸地树的直径。两次BFS,第一次随便找一个点宽搜。然后用上次宽搜时最远的点在宽搜。得到的最长距离就是树的直径。 CODE: #include <queue> #include <cstdio> #include <cstring> #include ...
分类:其他好文   时间:2017-07-21 15:48:31    阅读次数:128
HDu 5950 Recursive sequence(矩阵快速幂)
Recursive sequence Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1323 Accepted Submission(s): 5 ...
分类:其他好文   时间:2017-07-21 01:29:25    阅读次数:204
dp的两个不错的题
Keeping track of all the cows can be a tricky task so Farmer John has installed a system to automate it. He has installed on each cow an electronic ID ...
分类:其他好文   时间:2017-07-20 22:32:44    阅读次数:168
01分数规划+spfa判负环 POJ3621 Sightseeing Cows
Sightseeing Cows Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 10348 Accepted: 3539 Description Farmer John has decided to reward his cow ...
分类:其他好文   时间:2017-07-19 01:13:01    阅读次数:207
P2946 [USACO09MAR]牛飞盘队Cow Frisbee Team
题目描述 After Farmer Don took up Frisbee, Farmer John wanted to join in the fun. He wants to form a Frisbee team from his N cows (1 <= N <= 2,000) conven ...
分类:其他好文   时间:2017-07-18 22:08:30    阅读次数:148
Cow Marathon(树的直径)
传送门 Cow Marathon Time Limit: 2000MS Memory Limit: 30000K Total Submissions: 5362 Accepted: 2634 Case Time Limit: 1000MS Description After hearing abou ...
分类:其他好文   时间:2017-07-17 21:56:30    阅读次数:217
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