Astronomers often examine star maps where stars are represented by points on a plane and each star has Cartesian coordinates. Let the level of a star be an amount of the stars that are not higher and not to the right of the given star. Astronomers wa…

传送门 先按照下标x排序,然后依次把y加入树状数组,边加入边统计即可. 注意下标re从零开始,需+1s ——代码 # include <iostream> # include <cstdio> # include <cstring> # include <string> # include <cmath> # include <vector> # include <map> # include <queue>…

模板: int n; int tree[LEN]; int lowbit(int x){ return x&-x; } void update(int i,int d){//index,delta while(i<=n){ tree[i]+=d; i+=lowbit(i); } } int getsum(int i){ ; ){ ans+=tree[i]; i-=lowbit(i); } return ans; } 示意图: 1.Ultra-QuickSort 大佬代码: //树状数组 #i…

Stars Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 30496   Accepted: 13316 Description Astronomers often examine star maps where stars are represented by points on a plane and each star has Cartesian coordinates. Let the level of a st…

题意:给2个数字序列 a 和 b ,问按从小到达排序后,a中的哪些子串与b的名次匹配. a 的长度 N≤100,000,b的长度 M≤25,000,数字的大小 K≤25. 解法:[思考]1.X 暴力.枚举 a 中的子串,选出来排序后比对名次.O(n*  m log m  *m)=O(n*m^2*log m).    2.X  暴力+树状数组优化.枚举 a 中的子串,选出来后比较前缀名次(P.S.这种转化常出现,比如:[洛谷 p3368]模板-树状数组 2(数据结构) 就是将个体转化为前缀.),看…

Stars Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 4052    Accepted Submission(s): 1592 Problem Description Astronomers often examine star maps where stars are represented by points on a plan…

Language:Default Stars Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 52268 Accepted: 22486 Description Astronomers often examine star maps where stars are represented by points on a plane and each star has Cartesian coordinates. Let the…

Stars Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 54352   Accepted: 23386 Description Astronomers often examine star maps where stars are represented by points on a plane and each star has Cartesian coordinates. Let the level of a st…

算法学习:http://www.cnblogs.com/George1994/p/7710886.html 题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1541 Astronomers often examine star maps where stars are represented by points on a plane and each star has Cartesian coordinates. Let the level of a…

一.Ultra-QuickSort(树状数组求逆序数) 题目链接(点击) Ultra-QuickSort Time Limit: 7000MS   Memory Limit: 65536K Total Submissions: 73943   Accepted: 27692 Description In this problem, you have to analyze a particular sorting algorithm. The algorithm processes a seque…