随笔分类 - 图论学习笔记
摘要：把题意写一下： 给你一个n*n的矩阵，每个格子都有一个非负整数，从左上角走到右下角，收集走过的数字，累加，但是只能向右或者向下走，走过之后数字就变为0，让你求从左上角到右下角，走k次之后，所得的最大值是多少。典型的最小费用最大流入门题，只需在建图时，把源点到1的cap设成k，对走完一次变成0的处理时，只需拆点，拆成两条边，一条容量为1，权值为点权，另一条是跳板，容量为inf，费用为0，即可********************************************************************************************************
阅读全文
摘要：Problem Description1. It is a Strongly Connected graph.2. Each edge of the graph belongs to a circle and only belongs to one circle.We call this graph as CACTUS.There is an example as the figure above. The left one is a cactus, but the right one isn’t. Because the edge (0, 1) in the right graph belo
阅读全文
摘要：Problem DescriptionIt's now the year 21XX,when the earth will explode soon.The evil U.S. decided to invade the Mars to save their lives.But the childlike Marsmen never keeps any army,because war never take place on the Mars.So it's very convenient for the U.S. to act the action.Luckily,the M
阅读全文
摘要：Problem Description杭州有N个景区，景区之间有一些双向的路来连接，现在8600想找一条旅游路线，这个路线从A点出发并且最后回到A点，假设经过的路线为V1,V2,....VK,V1,那么必须满足K>2,就是说至除了出发点以外至少要经过2个其他不同的景区，而且不能重复经过同一个景区。现在8600需要你帮他找一条这样的路线，并且花费越少越好。Input第一行是2个整数N和M（N 2 #include 3 #include 4 #include 5 #include 6 #define inf 1dis[it][kt]+dis[kt][jt])23 dis...
阅读全文
摘要：Problem DescriptionLiyuan wanted to rewrite the famous book “Journey to the West” (“Xi You Ji” in Chinese pinyin). In the original book, the Monkey King Sun Wukong was trapped by the Buddha for 500 years, then he was rescued by Tang Monk, and began his journey to the west. Liyuan thought it is too b
阅读全文
摘要：Problem DescriptionTour operator Your Personal Holiday organises guided bus trips across the Benelux. Every day the bus moves from one city S to another city F. On this way, the tourists in the bus can see the sights alongside the route travelled. Moreover, the bus makes a number of stops (zero or m
阅读全文
摘要：Problem Description虽然草儿是个路痴（就是在杭电待了一年多，居然还会在校园里迷路的人，汗~),但是草儿仍然很喜欢旅行，因为在旅途中 会遇见很多人（白马王子，^0^），很多事，还能丰富自己的阅历，还可以看美丽的风景……草儿想去很多地方，她想要去东京铁塔看夜景，去威尼斯看电影，去阳明山上看海芋，去纽约纯粹看雪景，去巴黎喝咖啡写信，去北京探望孟姜女……眼看寒假就快到了，这么一大段时间，可不能浪费啊，一定要给自己好好的放个假，可是也不能荒废了训练啊，所以草儿决定在要在最短的时间去一个自己想去的地方！因为草儿的家在一个小镇上，没有火车经过，所以她只能去邻近的城市坐火车（好可怜啊~）。I
阅读全文
摘要：Problem DescriptionThere are N villages, which are numbered from 1 to N, and you should build some roads such that every two villages can connect to each other. We say two village A and B are connected, if and only if there is a road between A and B, or there exists a village C such that there is a
阅读全文
摘要：Problem Description年轻的探险家来到了一个印第安部落里。在那里他和酋长的女儿相爱了，于是便向酋长去求亲。酋长要他用10000个金币作为聘礼才答应把女儿嫁给他。探险家拿不出这么多金币，便请求酋长降低要求。酋长说："嗯，如果你能够替我弄到大祭司的皮袄，我可以只要8000金币。如果你能够弄来他的水晶球，那么只要5000金币就行了。"探险家就跑到大祭司那里，向他要求皮袄或水晶球，大祭司要他用金币来换，或者替他弄来其他的东西，他可以降低价格。探险家于是又跑到其他地方，其他人也提出了类似的要求，或者直接用金币换，或者找到其他东西就可以降低价格。不过探险家没必要用多样东
阅读全文
摘要：Problem DescriptionStockbrokers are known to overreact to rumours. You have been contracted to develop a method of spreading disinformation amongst the stockbrokers to give your employer the tactical edge in the stock market. For maximum effect, you have to spread the rumours in the fastest possible
阅读全文
摘要：Problem DescriptionAn ascending sorted sequence of distinct values is one in which some form of a less-than operator is used to order the elements from smallest to largest. For example, the sorted sequence A, B, C, D implies that A 2 #include 3 #include 4 #include 5 #include 6 using namespace ...
阅读全文
摘要：Problem DescriptionThe island nation of Flatopia is perfectly flat. Unfortunately, Flatopia has no public highways. So the traffic is difficult in Flatopia. The Flatopian government is aware of this problem. They're planning to build some highways so that it will be possible to drive between any
阅读全文
摘要：Problem DescriptionThe Borg is an immensely powerful race of enhanced humanoids from the delta quadrant of the galaxy. The Borg collective is the term used to describe the group consciousness of the Borg civilization. Each Borg individual is linked to the collective by a sophisticated subspace netwo
阅读全文
摘要：Problem DescriptionFarmer John has been elected mayor of his town! One of his campaign promises was to bring internet connectivity to all farms in the area. He needs your help, of course.Farmer John ordered a high speed connection for his farm and is going to share his connectivity with the other fa
阅读全文
摘要：Problem DescriptionAdvanced Cargo Movement, Ltd. uses trucks of different types. Some trucks are used for vegetable delivery, other for furniture, or for bricks. The company has its own code describing each type of a truck. The code is simply a string of exactly seven lowercase letters (each letter
阅读全文
摘要：Problem DescriptionFreddy Frog is sitting on a stone in the middle of a lake. Suddenly he notices Fiona Frog who is sitting on another stone. He plans to visit her, but since the water is dirty and full of tourists' sunscreen, he wants to avoid swimming and instead reach her by jumping.Unfortuna
阅读全文
摘要：Problem DescriptionWhile 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 destination at a time that is BEFORE you entered the wormhole! Each of FJ's farms comprisesN(1 ≤N≤ 500) f
阅读全文
摘要：Problem DescriptionSeveral currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and performs exchange operations only with these currencies. There can be several points specializing in the same pair of currencies. Each point has it
阅读全文
摘要：Problem DescriptionBeing a knight is a very attractive career: searching for the Holy Grail, saving damsels in distress, and drinking with the other knights are fun things to do. Therefore, it is not very surprising that in recent years the kingdom of King Arthur has experienced an unprecedented inc
阅读全文
摘要：Problem DescriptionIt's almost summer time, and that means that it's almost summer construction time! This year, the good people who are in charge of the roads on the tropical island paradise of Remote Island would like to repair and upgrade the various roads that lead between the various to
阅读全文
浙公网安备 33010602011771号