Problem F: Fabled Rooks We would like to place n rooks, 1 ≤ n ≤ 5000, on a n×n board subject to the following restrictions The i-th rook can only be placed within the rectangle given by its left-upper corner (xli, yli) and its right-lower corner (xri…

题目:点击打开题目链接 思路:为了满足所有的车不能相互攻击,就要保证所有的车不同行不同列,于是可以发现,行与列是无关的,因此题目可以拆解为两个一维问题,即在区间[1-n]之间选择n个不同的整数,使得第i个整数在区间[x, y]内,此问题可以通过贪心法解决,但需要注意选择合适的贪心策略.我的贪心方法是:以后约束点为重点考察对象对点进行排序,然后遍历给每一个点选择最小的合适的下标,若找不到合适的下标,说明无解. AC代码: #include <iostream> #include <algo…

问题来源:刘汝佳<算法竞赛入门经典--训练指南> P81: 问题描述:你的任务是在n*n(1<=n<=5000)的棋盘上放n辆车,使得任意两辆车不相互攻击,且第i辆车在一个给定的矩形R之内. 问题分析:1.题中最关键的一点是每辆车的x坐标和y坐标可以分开考虑(他们互不影响),不然会变得很复杂,则题目变成两次区间选点问题:使得每辆车在给定的范围内选一个点,任何两辆车不能选同一个点.  2.本题另外一个关键点是贪心法的选择,贪心方法:对所有点的区间,按右端点从小到大排序:每次在一个区间…

Problem F: Fabled Rooks We would like to place n rooks, 1 ≤ n ≤ 5000, on a n×n board subject to the following restrictions The i-th rook can only be placed within the rectangle given by its left-upper corner (xli, yli) and its right-lower corner (xri…

UVA - 11134 Fabled Rooks We would like to place n rooks, 1 ≤ n ≤ 5000, on a n × n board subject to the following restrictions The i-th rook can only be placed within the rectan- gle given by its left-upper corner (xli,yli) and its right- lower corner…

题目链接:uva 11134 - Fabled Rooks 题目大意:给出n,表示要在n*n的矩阵上放置n个车,并且保证第i辆车在第i个区间上,每个区间给出左上角和右小角的坐标.另要求任意两个车之间不能互相攻击. 解题思路:因为要保证说每两个车之间不能互相攻击,那么即任意行列都不能摆放两个以上的车,转而言之可以看成是将每一行或列分配给每辆车.如果行和列和起来考虑的话复杂度太高了,但是行和列的分配又互相不影响,所以可以分开讨论. 即对于一个区间[xl,xr],要分配一个x给它,做法和uva 142…

uva 6757 Cup of CowardsCup of Cowards (CoC) is a role playing game that has 5 different characters (Mage, Tank, Fighter,Assassin and Marksman). A team consists of 5 players (one from each kind) and the goal is to kill amonster with L life points. The…

Jurassic Remains Paleontologists in Siberia have recently found a number of fragments of Jurassic period dinosaur skeleton. The paleontologists have decided to forward them to the paleontology museum. Unfortunately, the dinosaur was so huge, that the…

题目链接: http://codeforces.com/gym/100526 http://acm.hunnu.edu.cn/online/?action=problem&type=show&id=11674&courseid=0 题目大意: N个学生M道题(1<=N<=12,1<=M<=30),每道题只有正误两种选项(0 1),每个学生的答题情况和正确题数已知,求标准答案可能有多少种. 如果标准答案只有一种则输出标准答案,否则输出解的个数. 题目思路: […

---恢复内容开始--- J - 中途相遇法 Time Limit:9000MS     Memory Limit:0KB     64bit IO Format:%lld & %llu Submit Status Description   The SUM problem can be formulated as follows: given four lists A, B, C, D<tex2html_verbatim_mark> of integer values, comput…