QUESTION : What are the 10 algorithms one must know in order to solve most algorithm challenges/puzzles? ANSWER: Dynamic Programming (DP) appears to account for a plurality (some estimate up to a third) of contest problems. Of course, DP is also not…

这篇文章开始正式<algorithm puzzles>一书中的解谜之旅了! 狼羊菜过河: 谜题:一个人在河边,带着一匹狼.一只羊.一颗卷心菜.他需要用船将这三样东西运至对岸,然而,这艘船空间有限,只容得下他自己和另一样东西(狼.羊或卷心菜).若他不在场看管的话,狼就会吃掉羊,羊就会吃掉卷心菜.此人如何才能把这三个“乘客”没有损失的送到对岸? 提示:看到这个谜题的谜面非常小,利用穷举解决是绰绰有余的. 解谜:首先搬运的一定是羊,将其搬运到对岸,将其放下,随后驾空船回来,这次带狼或者卷心菜都可以,…

这个专题我们开始对<algorithm puzzles>一书的学习,这本书是一本谜题集,包括一些数学与计算机起源性的古典命题和一些比较新颖的谜题,序章的几句话非常好,在这里做简单的摘录. 手里拿着一把锤子,看什么都像钉子.我们这个年代最厉害的锤子就是算法.——William Poundstone.  解题是一种实用技能,怎么说呢,有点像游泳吧.我们学习任何使用技能的办法就是模仿和实践.——George Polya.  如果想使得上课不那么无聊,那么没有比加入带有创造力的主题更好的办法了,这些主…

闲下来后,需要讲最近涉及到的算法全部整理一下,有个indice,方便记忆宫殿的查找 MIT的算法课,地球上最好:https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-046j-design-and-analysis-of-algorithms-spring-2015/lecture-notes/ Why Puzzles? Solving puzzles will help you sharpen you…

题目链接:http://codeforces.com/problemset/problem/337/A 题意:有n个学生,m块puzzles,选出n块puzzles,但是需要满足这n块puzzles里的最大pieces(A)和最小pieces(B)之差最少,即the least possible difference. 这是一道贪心兼排序的题目,解决方法不难.首先对m块puzzles以非递减的顺序排序(可以保证每个n长度的区间difference最小),接着求出所有长度为n的区间中最大和最小的值…

Warm up Problem Description   N planets are connected by M bidirectional channels that allow instant transportation. It's always possible to travel between any two planets through these channels. If we can isolate some planets from others by breaking…

Warm up Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 90    Accepted Submission(s): 12 Problem Description N planets are connected by M bidirectional channels that allow instant transportatio…

Warm up 2 Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others)Total Submission(s): 28    Accepted Submission(s): 8 Problem Description Some 1×2 dominoes are placed on a plane. Each dominoe is placed either horizontally…

A. Puzzles Time Limit: 20 Sec  Memory Limit: 256 MB 题目连接 http://codeforces.com/problemset/problem/337/A Description The end of the school year is near and Ms. Manana, the teacher, will soon have to say goodbye to a yet another class. She decided to p…

Warm up Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 5093    Accepted Submission(s): 1131 Problem Description N planets are connected by M bidirectional channels that allow instant transport…