题意:n*m的平面内有K个不安全点,Q个询问位置在(x,y)的人能走到多少个点?走到:(x,y)和(x',y')之间的矩形中不包含不安全点. 标程: #include<bits/stdc++.h> #define mid ((l+r)>>1) using namespace std; int read() { ,f=;char ch=getchar(); ;ch=getchar();} )+(x<<)+ch-',ch=getchar(); return x*f; } ;…

题意 有一个 \(n\times m\) 的二维网格,其中有 \(k\) 个禁止点. 有 \(q\) 组询问,每组询问为给一个点,求有多少个矩形以这个点为一角且不包含禁止点. \(n,m,k,q\le 10^5\) sol zjt 是怎么认为这是道李超树题的--难道只是因为看到了官方题解吗? 这题不难,但是太恶心了我琢磨了三小时,关键是没选手写题解,官方题解还写李超树误导人 不过官方题解除了最后一段最后一句外,其余内容还是可以借鉴的: 问题相当于平面中有若干障碍点,询问以某一个点为四个角之一的不…

题目链接 http://acm.hdu.edu.cn/showproblem.php?pid=6089 题解 这波强行维护搞得我很懵逼... 扫描线,只考虑每个点能走到左上方(不包括正上方,但包括正左方)的哪些点,然后旋转四次坐标系处理 所有询问和操作点按照先\(x\)后\(y\)坐标的顺序排序,然后枚举每一行,按\(y\)从小到大的顺序枚举这一行每个点 对于一个询问点找出前面最后一个操作点,那么要求的就是一个矩形减去一个区间内所有后缀最大值的和 然后这个东西可以用线段树直接维护,记录个区间最大…

2016暑假多校联合---Rikka with Sequence (线段树) Problem Description As we know, Rikka is poor at math. Yuta is worrying about this situation, so he gives Rikka some math tasks to practice. There is one of them: Yuta has an array A with n numbers. Then he make…

Rikka with wood sticks Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 600    Accepted Submission(s): 169 Problem Description As we know, Rikka is poor at math. Yuta is worrying about this situa…

Rikka with string Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 581    Accepted Submission(s): 227 Problem Description As we know, Rikka is poor at math. Yuta is worrying about this situation,…

题意: There is a city which is built like a tree.A terrorist wants to destroy the city's roads. But now he is alone, he can only destroy one road, then the city will be divided into two cities. Impression of the city is a number defined as the distance…

31 Rikka with Parenthesis II (六花与括号II) Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Description 题目描述 As we know, Rikka is poor at math. Yuta is worrying about this situation, so he gives Rikka some math tasks to…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5423 Rikka with Tree Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 321    Accepted Submission(s): 162 Problem Description As we know, Rikka is p…

Rikka with Graph Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 182    Accepted Submission(s): 95 Problem Description As we know, Rikka is poor at math. Yuta is worrying about this situation,…