4430: [Nwerc2015]Guessing Camels赌骆 Description Jaap, Jan, and Thijs are on a trip to the desert after having attended the ACM ICPC World Finals 2015 in Morocco. The trip included a camel ride, and after returning from the ride, their guide invited th…

[题意]给定三个长度为n的排列,求在三个排列中顺序相同的数对个数. [算法]逆序对 [题解]很容易联想到NOIP火柴排队,涉及顺序问题显然和逆序对息息相关. 一个数对如果在三个排列中顺序不同,一定是1+2或2+1,也就是只在两数列之间顺序相同. 所以对三个数列两两求逆序对总数num,则不满足要求的数对一定会产生且仅产生两个逆序对,ans=n*(n-1)/2-num/2. #include<cstdio> #include<cstring> #include<algorithm…

传送门:http://www.lydsy.com/JudgeOnline/problem.php?id=4430 [题解] 把每只骆驼在第一个人.第二个人.第三个人的位置找出来,然后做三维偏序即可. 排序+cdq分治+BIT # include <stdio.h> # include <string.h> # include <iostream> # include <algorithm> // # include <bits/stdc++.h>…

[题意概述] 给出三个n的排列,求有多少个数对在三个排列中顺序相同 [题解] 考虑用补集转化的方法,答案为总对数-不满足的对数 一对数不满足条件,当且仅当这对数在两个排列中顺序相同,在另一个排列中的顺序不同. 统计两两之间不满足偏序条件的数对的个数,那么每对数都被统计了两次 #include<cstdio> #include<algorithm> #include<cstring> #define LL long long using namespace std; co…

Description Jaap, Jan, and Thijs are on a trip to the desert after having attended the ACM ICPC World Finals 2015 in Morocco. The trip included a camel ride, and after returning from the ride, their guide invited them to a big camel race in the eveni…

4428: [Nwerc2015]Debugging调试 Description Your fancy debugger will not help you in this matter. There are many ways in which code can produce different behavior between debug and release builds, and when this happens, one may have to resort to more pr…

题意:给你三个1~n的排列a,b,c,问你在 (i,j)(1<=i<=n,1<=j<=n,i≠j),有多少个有序实数对(i,j)满足在三个排列中,i都在j的前面. 暴力求的话是三维偏序,相对比较困难.但是我们可以用一些简单的方法. 设在a中i在j前面的有序实数对数为A,b中为B,c中为C.(其实显然A=B=C=n*(n-1)/2) 要求的即为A∩B∩C. 利用容斥原理A+B+C-A∩B-A∩C-B∩C+A∩B∩C=A∪B∪C ①,以及Ω-A∪B∪C=A∩B∩C ②可容易求得.(显然…

难度在于读题 #include<cstdio> #include<algorithm> #include<queue> using namespace std; priority_queue<int,vector<int>,greater<int> > q; struct node{ int l,r; }e[1000005]; bool cmp(node a,node b){ return a.l<b.l; } int main…

Search GO 说明:输入题号直接进入相应题目,如需搜索含数字的题目,请在关键词前加单引号 Problem ID Title Source AC Submit Y 1000 A+B Problem 10983 18765 Y 1036 [ZJOI2008]树的统计Count 5293 13132 Y 1588 [HNOI2002]营业额统计 5056 13607 1001 [BeiJing2006]狼抓兔子 4526 18386 Y 2002 [Hnoi2010]Bounce 弹飞绵羊 43…

Season 1, Episode 13: End of the Tunnel -Fernando: The name is John Abruzzi. 名字是John Abruzzi A b r u z Z... A b r u z Z... I don't care what protocol is. protocol: 规程 care: 关心,在乎 管你什么规定 I just want to know if he's okay. 我只想知道他情况怎样 Hello? Hello? 喂? 喂?…