题目链接 题意: 在孤岛生存, 孤岛上有t头老虎,d头鹿, 每天会出现随机出现两只生物(包括你自己), 如果出现了一只老虎,那么你将被吃掉, 如果两只老虎, 则两只老虎会同归于尽,其他情况你都将生存下来. 当孤岛上没有老虎时, 就视为你生存成功. 问你生存成功的最大概率. 思路: 仔细想一想, 生存下来其实只和老虎有关, 因为你遇上其他情况, 你都会存活下来. 就相当于是一个0 - 1分布, 要么活下来, 要么被吃掉. 如果t只老虎是一个奇数, 那么必然存活失败, 因为老虎的消耗是成对的, 你要…

Island of Survival You are in a reality show, and the show is way too real that they threw into an island. Only two kinds of animals are in the island, the tigers and the deer. Though unfortunate but the truth is that, each day exactly two animals me…

题目链接:https://vjudge.net/problem/LightOJ-1265 1265 - Island of Survival    PDF (English) Statistics Forum Time Limit: 2 second(s) Memory Limit: 32 MB You are in a reality show, and the show is way too real that they threw into an island. Only two kind…

You are in a reality show, and the show is way too real that they threw into an island. Only two kinds of animals are in the island, the tigers and the deer. Though unfortunate but the truth is that, each day exactly two animals meet each other. So,…

#include <cstdio> #include <iostream> #include <cstring> #include <algorithm> using namespace std; int t,n,d; int main() { scanf("%d",&t); int cas=1; while(t--) { scanf("%d%d",&n,&d); printf("Ca…

题目链接...我找不着了 \(Description\) 岛上有t只老虎,1个人,d只鹿.每天随机有两个动物见面 1.老虎和老虎碰面,两只老虎就会同归于尽: 2.老虎和人碰面或者和鹿碰面,老虎都会吃掉对方: 3.人和鹿碰面,人可以选择吃或者不吃该鹿: 4.鹿和鹿碰面,相安无事: 求最后人活下来的最大期望概率. \(Solution\) 人要活下来,一定是所有的老虎都死亡,而老虎只能和老虎两两同归于尽. 所以如果老虎数量为奇数,那鹿总有一天会被吃完,人一定不能存活: 如果老虎数量为偶数,则考虑老虎…

题目链接:http://lightoj.com/volume_showproblem.php?problem=1265 题目大意:有一个生存游戏,里面t只老虎,d只鹿,还有一个人,每天都要有两个生物碰面,现在有以下规则 1.老虎和老虎碰面,两只老虎就会同归于尽 2.老虎和人碰面或者和鹿碰面,老虎都会吃掉对方 3.人和鹿碰面,人可以选择吃或者不吃该鹿 4.鹿和鹿碰面,相安无事 问人存活下来的概率 人生存下来的条件就是不被老虎吃掉,所以只要所有的老虎都同归于尽了,人就可以生存下来了  如果老虎的数量…

题目大意:有一个生存游戏,里面t仅仅老虎,d仅仅鹿,另一个人,每天都要有两个生物碰面,如今有下面规则 1.老虎和老虎碰面.两仅仅老虎就会同归于尽 2.老虎和人碰面或者和鹿碰面,老虎都会吃掉对方 3.人和鹿碰面.人能够选择吃或者不吃该鹿 4.鹿和鹿碰面,相安无事 问人存活下来的概率 解题思路:自己想复杂了.用了二维的dp... 看了别人的,发现根本不用dp,人生存下来的条件就是不被老虎吃掉,所以仅仅要全部的老虎都同归于尽了,人就能够生存下来了 假设老虎的数量是奇数,那么人总有一天会被吃掉的 假设老…

题意:有 t 只老虎,d只鹿,还有一个人,每天都要有两个生物碰面,1.老虎和老虎碰面,两只老虎就会同归于尽 2.老虎和人碰面或者和鹿碰面,老虎都会吃掉对方 3.人和鹿碰面,人可以选择杀或者不杀该鹿4.鹿和鹿碰面,没事问人存活下来的概率 析:最后存活肯定是老虎没了,首先可以用概率dp来解决,dp[i][j] 表示 还剩下 i 考虑, j 只鹿存活的概率是多少. 然后每次分析这几种情况即可. 还有一种思路就是只要考虑老虎没了,只要老虎没了就能存活,只要计算老虎全死完的概率就好,首先如果老虎是奇数,是…

Island of Survival Time Limit: 2 second(s) Memory Limit: 32 MB Program Description You are in a reality show, and the show is way too real that they threw into an island. Only two kinds of animals are in the island, the tigers and the deer. Though un…

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…

Lesson 12 Life on a desert island desert island ['dezət 'ailənd] n. 荒岛 uninhabited island coral island volcanic island archipelago the Indonesian archipelago peninsula the Korean peninsula paradise ['pæ rədaɪs] n. 天堂,伊甸园 heaven the Garden of Eden Haw…

You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are connected horizontally/vertically (not diagonally). The grid is completely surrounded by water, and there is exactly one isla…

https://leetcode.com/problems/island-perimeter/ 在一个N×N的矩阵中,N<100,1代表岛,0代表海,岛内没有海,求岛的周长 [[0,1,0,0], [1,1,1,0], [0,1,0,0], [1,1,0,0]] Answer: 16 Explanation: The perimeter is the 16 yellow stripes in the image below: 由正方形组成的不规则图形的周长和正方形个数有什么关系? 这个就是这题的…

#463. Island Perimeter You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are connected horizontally/vertically (not diagonally). The grid is completely surrounded by water, and th…

原题链接在这里:https://leetcode.com/problems/island-perimeter/ 题目: You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are connected horizontally/vertically (not diagonally). The grid is c…

Andrej Karpathy blog About Hacker's guide to Neural Networks A Survival Guide to a PhD Sep 7, 2016 This guide is patterned after my "Doing well in your courses", a post I wrote a long time ago on some of the tips/tricks I've developed during my…

Description There are N cities and N-1 roads in Magic-Island. You can go from one city to any other. One road only connects two cities. One day, The king of magic-island want to visit the island from the capital. No road is visited twice. Do you know…

B. Island Puzzle time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output A remote island chain contains n islands, labeled 1 through n. Bidirectional bridges connect the islands to form a simple c…

D. Bad Luck Island time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output The Bad Luck Island is inhabited by three kinds of species: r rocks, s scissors and p papers. At some moments of time two…

6.4 A bunch of people are living on an island, when a visitor comes with a strange order: all blue-eyed people must leave the island as soon as possible. There will be a flight out at 8:00pm every evening. Each person can see everyone else's eye colo…

原创博客,未经允许,不得转载. 生存分析,survival analysis,顾名思义是用来研究个体的存活概率与时间的关系.例如研究病人感染了病毒后,多长时间会死亡:工作的机器多长时间会发生崩溃等.  这里“个体的存活”可以推广抽象成某些关注的事件. 所以SA就成了研究某一事件与它的发生时间的联系的方法.这个方法广泛的用在医学.生物学等学科上,近年来也越来越多人用在互联网数据挖掘中,例如用survival analysis去预测信息在社交网络的传播程度,或者去预测用户流失的概率. R里面有很成熟…

A Survival Guide to a PhD Sep 7, 2016 This guide is patterned after my “Doing well in your courses”, a post I wrote a long time ago on some of the tips/tricks I’ve developed during my undergrad. I’ve received nice comments about that guide, so in the…

从 asset store 下载 Survival Shooter (商店里有2个版本,一种是给Unity5用的,一个是给Unity4.6用的,我们这个实验用的是后者,版本是2.2.如果) 1 删除多余的代码及文件夹 /Scripts/       <-- 因为没有用 /Scenes/       <-- 因为是空的 /Animation/   <-- 因为是空的 /Prefabs/Hellephant.prefab       <-- 因为没有用 /Prefabs/ZomBear…

B. Island Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100114 Description On February 30th this year astronauts from the International Space Station flew over the Pacific Ocean and took a picture, on which was discovered a pr…

推荐大家一本书尤其是即将读研究生或者研一研二的学生:                                                     A Mathematician‘s  Survival Guide                                                         Graduate School and  Early Career Development                                    …

转载请注明出处:http://blog.csdn.net/u012860063 题目链接:pid=4280">http://acm.hdu.edu.cn/showproblem.php?pid=4280 Problem Description In the vast waters far far away, there are many islands. People are living on the islands, and all the transport among the is…