Tunnel Warfare Time Limit: 1 Sec  Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=1540 Description During the War of Resistance Against Japan, tunnel warfare was carried out extensively in the vast areas of north China Plain. Gene…

题意:求坐标0到x间的点的个数 思路:线段树,主要是转化,根据题意的输入顺序,保证了等级的升序,可以直接求出和即当前等级的点的个数,然后在把这个点加入即可. 注意:线段树下标从1开始,所以把所有的x加1存储. #include<iostream> #include<stdio.h> #include<string.h> using namespace std; #define MAXN 32005 #define MAXL 15005 int ans; int lev[…

单点更新,更新时先除去 原来的数,因为有去摸,可以用乘上逆元代替. //============================================================================ // Name : A.cpp // Author : L_Ecry // Version : // Copyright : Your copyright notice // Description : Hello World in C++, Ansi-style //==…

Billboard Time Limit: 20000/8000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 14337    Accepted Submission(s): 6148 Problem Description At the entrance to the university, there is a huge rectangular billboard of…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2795 Billboard Time Limit: 20000/8000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 13050    Accepted Submission(s): 5651 Problem Description At the entrance to the un…

Multiply game Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3224    Accepted Submission(s): 1173 Problem Description Tired of playing computer games, alpc23 is planning to play a game on numbe…

敌兵布阵 Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 87684    Accepted Submission(s): 36912 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…

HDU.1166 敌兵布阵 (线段树 单点更新 区间查询) 题意分析 加深理解,重写一遍 代码总览 #include <bits/stdc++.h> #define nmax 100000 using namespace std; struct Tree{ int l,r,val; int lazy; int mid(){ return (l+r)>>1; } }; Tree tree[nmax<<2]; int num[nmax<<2]; void Pus…

HDU.1394 Minimum Inversion Number (线段树 单点更新 区间求和 逆序对) 题意分析 给出n个数的序列,a1,a2,a3--an,ai∈[0,n-1],求环序列中逆序对最少的个数. 前置技能 环序列 还 线段树的逆序对求法 逆序对:ai > aj 且 i < j ,换句话说数字大的反而排到前面(相对后面的小数字而言) 环序列:把第一个放到最后一个数后面,就是一次成环,一个含有n个元素序列有n个环序列. 线段树的逆序对求法:每个叶子节点保存的是当前值数字的个数.根…

Billboard Time Limit: 1 Sec  Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=2795 Description At the entrance to the university, there is a huge rectangular billboard of size h*w (h is its height and w is its width). The board is…