题目链接:https://vjudge.net/problem/LightOJ-1287 1287 - Where to Run    PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Limit: 32 MB Last night you robbed a bank but couldn't escape and when you just got outside today, the police started ch…

题目链接:http://www.lightoj.com/volume_showproblem.php?problem=1287 题意:给定一个n个点的无向图(0到n-1),你开始在0.你开始遍历这个图,每个点只能被遍历一次.当你在某个点u时,假设u可以到达v1,v2且到达v1或者v2后均可以将其他未遍历的点遍历完,则你在u有三种选择:1.在u再呆5分钟:2.去v1,:3.去v2.概率均为1/3.求遍历完整个图的时间期望. 思路:f[u]=(5+f[u])/(x+1)+(g[u][vi]+f[vi…

Where to Run Last night you robbed a bank but couldn't escape and when you just got outside today, the police started chasing you. The city, where you live in, consists of some junctions which are connected by some bidirectional roads. Since police i…

题面: Last night you robbed a bank but couldn't escape and when you just got outside today, the police started chasing you. The city, where you live in, consists of some junctions which are connected by some bidirectional roads. 题意: 没读懂,还是看了其他人的博客~~~ 就…

Where to Run LightOJ - 1287(概率dp) 题面长长的,看了半天也没看懂题意 不清楚的地方,如何判断一个点是否是EJ 按照我的理解 在一个EJ点处,要么原地停留五分钟接着走,要么直接走,但是这样样例都对不上 mmp,原来是说,在原地停留五分钟后再继续这两种选择 而且题目问的是 求被警察抓的期望时间,实际上却是求遍历完整张图的期望时间,也就是说总是会走是EJ的点 对于每个点来说从该点出发的期望时间\(dp[i] = \frac{dp[i]+5}{cnt+1} + \frac…

KUANGBIN带你飞 全专题整理 https://www.cnblogs.com/slzk/articles/7402292.html 专题一 简单搜索 POJ 1321 棋盘问题    //2019.3.18 POJ 2251 Dungeon Master POJ 3278 Catch That Cow  //4.8 POJ 3279 Fliptile POJ 1426 Find The Multiple  //4.8 POJ 3126 Prime Path POJ 3087 Shuffle…

正推不行就逆推! 经典问题:生日悖论 换成其互斥事件:m个人, 每个人生日都不相同的概率 ≤ 0.5 时最小人数. 这就是邮票收集问题的变形:每个邮票至少出现一次的概率 小于等于 0.5 邮票收集问题资料:https://en.wikipedia.org/wiki/Coupon_collector%27s_problem 我们现在面对的是一个n面的骰子, 骰子的每面都是随机出现的, 求问将所有面都被看完所期望的投掷次数(假设只看最上面那一面) 那么, 问题的解就是: H[n] = (1 + 1/…

[kuangbin带你飞]专题1-23 专题一 简单搜索 POJ 1321 棋盘问题POJ 2251 Dungeon MasterPOJ 3278 Catch That CowPOJ 3279 FliptilePOJ 1426 Find The MultiplePOJ 3126 Prime PathPOJ 3087 Shuffle'm UpPOJ 3414 PotsFZU 2150 Fire GameUVA 11624 Fire!POJ 3984 迷宫问题HDU 1241 Oil Deposit…

专题一 简单搜索 POJ 1321 棋盘问题POJ 2251 Dungeon MasterPOJ 3278 Catch That CowPOJ 3279 FliptilePOJ 1426 Find The MultiplePOJ 3126 Prime PathPOJ 3087 Shuffle'm UpPOJ 3414 PotsFZU 2150 Fire GameUVA 11624 Fire!POJ 3984 迷宫问题HDU 1241 Oil DepositsHDU 1495 非常可乐HDU 26…

Aladdin and the Flying Carpet Time Limit:3000MS     Memory Limit:32768KB     64bit IO Format:%lld & %llu Submit Status Practice LightOJ 1341 Appoint description:  System Crawler  (2016-07-08) Description It's said that Aladdin had to solve seven myst…