A \(x\times-y+y\times x=0\),因为 \(n\) 是偶数,所以两两这样构造即可. 时间复杂度 \(O\left(Tn\right)\). B 有点绕的题,要理清思路. 发现行和列其实都是完整的,只是要搞出顺序. 通过列记录每个数字所属的行,然后枚举每行的任意一个数字找出它是第几行,就还原好了. 时间复杂度 \(O\left(\sum nm\right)\). C 鸽了. D 把依次进货的手里剑塞进一个链表里,初始价格均设置为 \(0\). 每次向前找到还未买过的第一把手里…

1435. [USACO NOV]金发姑娘和N头牛 ★★☆   输入文件:milktemp.in   输出文件:milktemp.out   简单对比时间限制:1 s   内存限制:256 MB [题目描述] 你可能已经听说了金发姑娘和3只熊的经典故事. 鲜为人知的是,金发姑娘最终经营了一个农场.在她的农场,她有一个谷仓含N头奶牛(1<=N <= 20000).不幸的是,她的奶牛对温度相当敏感. 第i头奶牛必须在指定的温度范围内A(i)..B(i)才感觉舒适:(0<=A(i)<=B…

    Programming Contest Problem Types Hal Burch conducted an analysis over spring break of 1999 and made an amazing discovery: there are only 16 types of programming contest problems! Furthermore, the top several comprise almost 80% of the problems s…

Area of Mushroom Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 2390    Accepted Submission(s): 578 Problem Description Teacher Mai has a kingdom with the infinite area. He has n students guard…

Differencia Time Limit: 10000/10000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 601    Accepted Submission(s): 173 Problem Description Professor Zhang has two sequences a1,a2,...,an and b1,b2,...,bn. He wants to…

Rigid Frameworks Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 337    Accepted Submission(s): 273 Problem Description Erik Demaine is a Professor in Computer Science at the Massachusetts Insti…

题目链接: Coding Contest Time Limit: 2000/1000 MS (Java/Others)     Memory Limit: 65536/65536 K (Java/Others) Problem Description A coding contest will be held in this university, in a huge playground. The whole playground would be divided into N blocks,…

偏方记录背包里的物品.....每个背包的价值+0.01 Happy Programming Contest Time Limit: 2 Seconds      Memory Limit: 65536 KB In Zhejiang University Programming Contest, a team is called "couple team" if it consists of only two students loving each other. In the cont…

2012 Multi-University Training Contest 9 / hdu4389 打巨表,实为数位dp 还不太懂 先这样放着.. 对于打表,当然我们不能直接打,这里有技巧.我们可以这样:每隔100000我们统计一次,这样在10^9范围内,我们得到10000个数. 然后就很好解决了... 数位dp:http://blog.csdn.net/acdreamers/article/details/9318727 #include<iostream> #include<cst…

2014 Multi-University Training Contest 9#11 Killing MonstersTime Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 562    Accepted Submission(s): 308 Problem Description Kingdom Rush is a popular TD…