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POJ 3259 Wormholes( bellmanFord判负环)
WormholesTime Limit: 2000MSMemory Limit: 65536KTotal Submissions: 36425Accepted: 13320DescriptionWhile exploring his many farms, Farmer John has disco...
分类:其他好文   时间:2015-08-09 12:10:55    阅读次数:153
POJ-3259 Wormholes(判断负环、模板)
DescriptionWhile exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-w...
分类:其他好文   时间:2015-07-28 10:23:46    阅读次数:707
poj 3259 Wormholes(Bellman-Ford)
poj 3259 WormholesDescriptionWhile exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very peculiar because it is a one-way path that delivers you to its...
分类:其他好文   时间:2015-07-26 15:53:29    阅读次数:216
POJ Wormholes (SPFA)
http://poj.org/problem?id=3259DescriptionWhile exploring his many farms, Farmer John has discovered a number of amazing wormholes. A wormhole is very ...
分类:其他好文   时间:2015-07-21 10:35:43    阅读次数:99
POJ 3259 Wormholes 虫洞(负权最短路,负环)
题意:给一个混合图,求判断是否有负环的存在,若有,输出YES,否则NO。有重边。思路:这是spfa的功能范围。一个点入队列超过n次就是有负环了。因为是混合图,所以当你跑一次spfa时发现没有负环,但是负环仍可能存在,因为有向边! 但是单源最短路也有起点啊,难道穷举起点?不用,负环是必须有某些边是带....
分类:其他好文   时间:2015-07-20 23:01:34    阅读次数:122
USACO Wormholes(模拟)
题目请点我 题解: 这道题思路很简单,就是简单的深搜,找出所有的组合,然后判断能否成环。关键在于如何判断能否成环,我的思路是利用递归模拟,看能否第二次经过某一个点。中间也出现了错误,首先,每次访问的下一个点应该是同一行上当前点右边的第一个点;其次,某个点被访问过必须是作为起点被访问过,而不仅仅是到达。 代码实现:/* ID: eashion LANG: C++ TASK: wormhole *...
分类:其他好文   时间:2015-07-19 10:20:47    阅读次数:547
F - Wormholes
题目大意:农民约翰在农场散步的时候发现农场有大量的虫洞,这些虫洞是非常特别的因为它们都是单向通道,为了方便现在把约翰的农田划分成N快区域,M条道路,W的虫洞。约翰是时空旅行的粉丝,他希望这样做,在一个区域开始,经过一些道路和虫洞然后回到他原来所在的位置,这样也许他就能见到他自己了。穿越虫洞会回到以前...
分类:其他好文   时间:2015-07-17 13:35:14    阅读次数:234
uva 558 Wormholes (Bellman-Ford算法判断负环)
uva 558 WormholesIn the year 2163, wormholes were discovered. A wormhole is a subspace tunnel through space and time connecting two star systems. Wormholes have a few peculiar properties:Wormholes are...
分类:编程语言   时间:2015-07-12 17:29:24    阅读次数:130
poj3259 bellman——ford Wormholes解绝负权问题
WormholesTime Limit:2000MSMemory Limit:65536KTotal Submissions:35103Accepted:12805DescriptionWhile exploring his many farms, Farmer John has discovere...
分类:其他好文   时间:2015-07-10 02:08:21    阅读次数:1098
Wormholes - poj 3259 (Bellman-Ford算法)
Time Limit:2000MSMemory Limit:65536KTotal Submissions:34934Accepted:12752DescriptionWhile exploring his many farms, Farmer John has discovered a numbe...
分类:编程语言   时间:2015-07-08 12:49:09    阅读次数:132
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