Billboard 通过这题,我知道了要活用线段树的思想,而不是拘泥于形式, 就比如这题 显然更新和查询放在一起很简单 但如果分开写 那么我觉得难度会大大增加 [题目链接]Billboard [题目类型]区间求最大值的位置update的操作在query里做了 &题意: h*w的木板,放进一些1*L的物品,求每次放空间能容纳且最上边的位子 &题解: 思路:每次找到最大值的位子,然后减去L 线段树功能:query 区间求最大值的位置(直接把update的操作在query里做了) [时间复杂度]…

三维场景中对于渲染效果不是很精致的物体可以使用BillBoard技术实现,使用该技术需要将物体实时朝向摄像机,即计算billboard的旋转矩阵M. 首先根据摄像机位置cameraPos和billBoard中心点的坐标centerPos,计算出向量look = centerPos - cameraPos; 然后计算bilboard的向量right = look * cameraUP; 最后计算billboard的向量up = right * look; 最终得到M = mat(right,up,…

题目链接: 传送门 Billboard Time Limit: 2000MS     Memory Limit: 32768 K Description At the entrance to the university, there is a huge rectangular billboard of size hw (h is its height and w is its width). The board is the place where all possible announcem…

 Billboard Time Limit:8000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Description 在学校的入口处有一个巨大的矩形广告牌,高为h,宽为w.所有种类的广告都可以贴,比如ACM的广告啊,还有餐厅新出了哪些好吃的,等等..   在9月1号这天,广告牌是空的,之后广告会被一条一条的依次贴上去.   每张广告都是高度为1宽度为wi的细长的矩形纸条.   贴广告的人总是会优先选择最上面的位置来…

Problem 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 the place where all possible announcements are posted: nearest programming competitions, chang…

Billboard Time Limit:8000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status 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 t…

Billboard Time Limit: 20000/8000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 19225    Accepted Submission(s): 8042 Problem Description At the entrance to the university, there is a huge rectangular billboard of…

Billboard Time Limit: 20000/8000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 10594    Accepted Submission(s): 4686 Problem Description At the entrance to the university, there is a huge rectangular billboard of s…

Strange Billboard 题目链接: http://acm.hust.edu.cn/vjudge/contest/129733#problem/A Description The marketing and public-relations department of the Czech Technical University has designed a new reconfigurable mechanical Flip-Flop Bill-Board (FFBB). The b…

题目链接 题意 : 给你一个矩阵,有黑有白,翻转一个块可以让上下左右都翻转过来,问最少翻转多少次能让矩阵变为全白. 思路 : 我们从第一行开始枚举要翻转的状态,最多可以枚举到2的16次方,因为你只要第一行的确定了,第二行要翻转的也就确定了,所以第一行的状态决定了最后的状态.看了网上大神,真是让位运算废了啊,,,,,太复杂了...... #include <iostream> #include <stdio.h> #include <string.h> #include…

题目大意:有一个h*w的公告榜,可以依次在上面添加信息.每个信息的长度为x,高为1. 优先在最上面加入,如果空间足够的话,然后优先放在最左面.统计每条公告最终的位置,即它所在的行数. 这里是线段树来存储 当前区间(i,j)的所有位置,剩余的最大空间. 初始化即为w,公告榜的宽. Problem Description At the entrance to the university, there is a huge rectangular billboard of size h*w (h is…

Billboard Time Limit : 20000/8000ms (Java/Other)   Memory Limit : 32768/32768K (Java/Other) Total Submission(s) : 12   Accepted Submission(s) : 6 Problem Description At the entrance to the university, there is a huge rectangular billboard of size h*w…

Billboard Time Limit: 20000/8000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 16023    Accepted Submission(s): 6770 Problem Description At the entrance to the university, there is a huge rectangular billboard of s…

Billboard Time Limit: 20000/8000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 17190    Accepted Submission(s): 7266 Problem Description At the entrance to the university, there is a huge rectangular billboard of s…

http://acm.hdu.edu.cn/showproblem.php?pid=1882 感觉非常不错的一道题. 给一个n*m(1<=n,m<=16)的矩阵,每一个格子都有黑白两面,当翻一个格子时,它的上下左右都要翻转,问最后使格子全变为白色的最少翻转步数. 仅仅需枚举第一行的状态即可,由于对于第i(i>=2)行j列翻转情况受上一行的制约,仅仅有当上一行也是'X'的时候,该行j列才干翻转,使i-1行j列变为'.',否则i行j列不能翻转.依次进行下去,当最后一行全变为白色,说明翻转成功…

Billboard Time Limit: 20000/8000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 11861    Accepted Submission(s): 5223 Problem Description At the entrance to the university, there is a huge rectangular billboard of s…

Billboard Time Limit: 20000/8000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 16755    Accepted Submission(s): 7089 Problem Description At the entrance to the university, there is a huge rectangular billboard of…

Billboard Time Limit: 20000/8000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 9632    Accepted Submission(s): 4286 Problem Description At the entrance to the university, there is a huge rectangular billboard of s…

Strange Billboard Time Limit: 2 Seconds Memory Limit: 65536 KB The marketing and public-relations department of the Czech Technical University has designed a new reconfigurable mechanical Flip-Flop Bill-Board (FFBB). The billboard is a regular two-di…

状态压缩,我们枚举第一行的所有状态,然后根据第一行去转变下面的行,枚举或者深搜直到最后最后一行,可以判断是不是所有的1都可以全部转换为0,记录所有的解,输出最小的一个就可以. 这里有一个很重要的优化,就是当n比m大的,转置这个矩阵,如果不加这个在G++的情况下会超时,C++900Ms多AC.代码及注释如下 #include<stdio.h> #include<iostream> #include<string.h> #include<queue> #incl…

CSharpGL(46)用Billboard绘制头顶文字 本文介绍CSharpGL用Billboard绘制头顶文字的方法.效果如下图所示. 下载 CSharpGL已在GitHub开源,欢迎对OpenGL有兴趣的同学加入(https://github.com/bitzhuwei/CSharpGL) 固定大小的Billboard 在OpenGL的渲染流水线上,描述顶点位置的坐标,依次要经过object space, world space, view/camera space, clip space…

Billboard Time Limit: 20000/8000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 21203    Accepted Submission(s): 8750 Problem Description At the entrance to the university, there is a huge rectangular billboard of…

CSharpGL(46)用Billboard绘制头顶文字 本文介绍CSharpGL用Billboard绘制头顶文字的方法.效果如下图所示. 下载 CSharpGL已在GitHub开源,欢迎对OpenGL有兴趣的同学加入(https://github.com/bitzhuwei/CSharpGL) 固定大小的Billboard 在OpenGL的渲染流水线上,描述顶点位置的坐标,依次要经过object space, world space, view/camera space, clip space…

You are installing a billboard and want it to have the largest height.  The billboard will have two steel supports, one on each side.  Each steel support must be an equal height. You have a collection of rods which can be welded together.  For exampl…

Billboard Time Limit: 20000/8000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Problem 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…

Billboard Time Limit: 20000/8000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 15625    Accepted Submission(s): 6580 Problem Description At the entrance to the university, there is a huge rectangular billboard of…

hdu2795 Billboard 题意:h*w的木板,放进一些1*L的物品,求每次放空间能容纳且最上边的位子 思路:每次找到最大值的位子,然后减去L 线段树功能:query:区间求最大值的位子(直接把update的操作在query里做了) 题意:有一块长方形h*w的广告板,往上面贴广告,然后给n个1*wi的广告,要求把广告贴上去,如果前面的行可以贴,就要贴前面的并且要靠左贴,前面的贴不下就贴在下面, 广告的高度是wi,如果能贴在上面输出最小的高度,如果不能就输出-1. 解题思路:如果以行数为区…

HUD.2795 Billboard ( 线段树 区间最值 单点更新 单点查询 建树技巧) 题意分析 题目大意:一个h*w的公告牌,要在其上贴公告. 输入的是1*wi的w值,这些是公告的尺寸. 贴公告要满足的条件: 1. 尽量往上,同一高度尽量靠左. 2. 求第n个广告所在的行数. 3. 没有合适的位置贴了则输出-1. 建树技巧 首先看了一下数据范围h和w都在1e9,按照高度建树不太现实的.但是发现询问只有2e5,.仔细想一下如果h < 2e5, 我们用h建树,否则用n建树.原因是,每个高度只放…

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…

题目链接 Problem 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 the place where all possible announcements are posted: nearest programming competitions,…