花了近5个小时,改的乱七八糟,终于A了. 一个无限数列,1,2,3,4,...,n....,给n个数对<i,j>把数列的i,j两个元素做交换.求交换后数列的逆序对数. 很容易想到离散化+树状数组,但是发现那些没有交换的数也会产生逆序对数,但我没有算. 经明神提示, 把没有用到的数字段化成点.然后用树状数组算一下就好了. 然后我用一个数组记录每个点的长度.比如 <1,2><5,6>,1,2,3,4,5,6只有1,2,5,6用到了,那么离散化为1,2,3,4,5,f[1]=…

题目连接:http://acm.hdu.edu.cn/showproblem.php?pid=6318 Problem Description Long long ago, there was an integer sequence a.Tonyfang think this sequence is messy, so he will count the number of inversions in this sequence. Because he is angry, you will ha…

题意:给你若干个区间,询问每个区间包含几个其它区间 分析:区间范围比较大,然后离散化,按右端点排序,每次更新树状数组中的区间左端点,查询区间和 注:(都是套路) #include<cstdio> #include<cstring> #include<queue> #include<cstdlib> #include<algorithm> #include<vector> #include<cmath> using name…

6318.Swaps and Inversions 这个题就是找逆序对,然后逆序对数*min(x,y)就可以了. 官方题解:注意到逆序对=交换相邻需要交换的次数,那么输出 逆序对个数 即可. 求逆序对有4种操作,线段树 .BIT.归并排序.树状数组. 我敲了线段树.归并排序和树状数组版的. 关于这几种方法求逆序对,自行百度吧,懒了... 代码(线段树版-注意排序): //1010-找逆序对数-线段树求逆序对数 #include<iostream> #include<cstdio>…

Ultra-QuickSort Time Limit: 7000MS   Memory Limit: 65536K Total Submissions: 50517   Accepted: 18534 Description In this problem, you have to analyze a particular sorting algorithm. The algorithm processes a sequence of n distinct integers by swappin…

HDU 5862 Counting Intersections(离散化+树状数组) 题目链接http://acm.split.hdu.edu.cn/showproblem.php?pid=5862 Description Given some segments which are paralleled to the coordinate axis. You need to count the number of their intersection. The input data guarant…

BZOJ_4627_[BeiJing2016]回转寿司_离散化+树状数组 Description 酷爱日料的小Z经常光顾学校东门外的回转寿司店.在这里,一盘盘寿司通过传送带依次呈现在小Z眼前.不同的寿 司带给小Z的味觉感受是不一样的,我们定义小Z对每盘寿司都有一个满意度,例如小Z酷爱三文鱼,他对一盘三文 鱼寿司的满意度为10:小Z觉得金枪鱼没有什么味道,他对一盘金枪鱼寿司的满意度只有5:小Z最近看了电影“美 人鱼”,被里面的八爪鱼恶心到了,所以他对一盘八爪鱼刺身的满意度是-100.特别地,小Z是…

Ultra-QuickSort Time Limit: 7000MS   Memory Limit: 65536K Total Submissions: 38258   Accepted: 13784 Description In this problem, you have to analyze a particular sorting algorithm. The algorithm processes a sequence of n distinct integers by swappin…

 Nested Segments time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given n segments on a line. There are no ends of some segments that coincide. For each segment find the number of s…

Disharmony Trees Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 663    Accepted Submission(s): 307 Problem Description One day Sophia finds a very big square. There are n trees in the square. T…