题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=1166 题目大意: 维护动态的区间和,单点更新,就是模板题 #include<iostream> #include<algorithm> #include<set> #include<cstring> #include<cstdio> using namespace std; + ; typedef long long ll; int tree[ma…
Problem Description C国的死对头A国这段时间正在进行军事演习,所以C国间谍头子Derek和他手下Tidy又开始忙乎了.A国在海岸线沿直线布置了N个工兵营地,Derek和Tidy的任务就是要监视这些工兵营地的活动情况.由于采取了某种先进的监测手段,所以每个工兵营地的人数C国都掌握的一清二楚,每个工兵营地的人数都有可能发生变动,可能增加或减少若干人手,但这些都逃不过C国的监视. 中央情报局要研究敌人究竟演习什么战术,所以Tidy要随时向Derek汇报某一段连续的工兵营地一共有多少…
水题,练习一下树状数组实现区间更新. 对于每个区间,区间左端点+1,右端点的后一位-1,查询每个位置的覆盖次数 #include <cstdio> #include <cstring> ; int N, C[MAXN]; int lowbit( int x ) { return (-x)&x; } void update(int x, int add) { for(int i = x; i <= N; i += lowbit(i)) C[i] += add; retu…
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…
Triple Time Limit: 12000/6000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 388 Accepted Submission(s): 148 Problem Description Given the finite multi-set A of n pairs of integers, an another finite multi-set B …
Group Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1959 Accepted Submission(s): 1006 Problem Description There are n men ,every man has an ID(1..n).their ID is unique. Whose ID is i and i…