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poj--2229
Description Farmer John commanded his cows to search for different sets of numbers that sum to a given number. The cows use only numbers that are an i ...
分类:其他好文   时间:2018-09-03 02:20:50    阅读次数:138
poj3621 Sightseeing Cows
01分数规划 二分+spfa负环(SLF优化) ...
分类:其他好文   时间:2018-08-27 10:30:11    阅读次数:99
[USACO15JAN]草鉴定Grass Cownoisseur(分层图+tarjan)
[USACO15JAN]草鉴定Grass Cownoisseur 题目描述 In an effort to better manage the grazing patterns of his cows, Farmer John has installed one way cow paths all ...
分类:其他好文   时间:2018-08-26 22:03:35    阅读次数:154
TOJ 1594 Optimal Milking(二分+最大流)
描述 FJ has moved his K (1 <= K <= 30) milking machines out into the cow pastures among the C (1 <= C <= 200) cows. A set of paths of various lengths ru ...
分类:其他好文   时间:2018-08-25 23:03:33    阅读次数:348
TOJ 1705 Dining(拆点最大流)
描述 Cows are such finicky eaters. Each cow has a preference for certain foods and drinks, and she will consume no others. Farmer John has cooked fabulo ...
分类:其他好文   时间:2018-08-25 22:17:59    阅读次数:256
P2017 [USACO09DEC]晕牛Dizzy Cows
给你一张有向无向混合图,要求你为无向边定向,使得图上没有环。 开始看到被卡了,考虑tarjan但是又有无向边又有有向边的确不是很好做 考虑全部是有向图但是没有环的DAG图,一般我们的判定方式都是用拓扑排序 但是如果你把边全部搞进来,发现没法排,怎么办呢? 思路在于你看到其实无向边是转化成有向边的,所 ...
分类:其他好文   时间:2018-08-24 10:59:48    阅读次数:162
poj 3667 Hotel (线段树+区间合并)
Hotel Time Limit: 3000MS Memory Limit: 65536K Total Submissions: 20468 Accepted: 8924 Description The cows are journeying north to Thunder Bay in Cana ...
分类:其他好文   时间:2018-08-24 02:12:33    阅读次数:178
poj 2385 Apple Catching
Description It is a little known fact that cows love apples. Farmer John has two apple trees (which are conveniently numbered 1 and 2) in his field, e ...
分类:移动开发   时间:2018-08-23 20:12:10    阅读次数:197
[USACO08NOV]Mixed Up Cows
嘟嘟嘟 一看n那么小,那一定是状压dp了(表示从没写过,慌)。 首先dp[i][j](i 是一个二进制数,第x位为1代表选了第x头牛),表示 i 这个状态最后一头牛是第 j 头牛时的方案数。 然后当 j 被选上时,即 if(i & (1 << (j - 1)))时,我们在枚举倒数第二头牛p,也是当他 ...
分类:其他好文   时间:2018-08-23 16:51:53    阅读次数:189
poj 2376 Cleaning Shifts
Description Farmer John is assigning some of his N (1 <= N <= 25,000) cows to do some cleaning chores around the barn. He always wants to have one cow ...
分类:其他好文   时间:2018-08-22 11:10:48    阅读次数:185
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