TOYS Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 14433   Accepted: 6998 Description Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child John never puts his toys away w…

题目:http://poj.org/problem?id=2318 题意: 给定一个如上的长方形箱子,中间有n条线段,将其分为n+1个区域,给定m个玩具的坐标,统计每个区域中的玩具个数.(其中这些线段有序且不相交) 解答: 因为线段是有序给出,所以不用排序,判断某个点在哪个区域,采用二分法,将某个点和线段的叉积来判断这个点是在线的左边或者右边,根据这个来二分找出区域. 这是第一道计算几何的题目,怎么说呢,对于二分的边界问题还有点搞不清楚,这次是对线段二分,感觉二分真的很有用处. 开阔思维!!!具…

Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child John never puts his toys away when he is finished playing with them. They gave John a rectangular box to put his toys in, but John i…

                                                             TOYS 2页的提交记录终于搞明白了. 题意:一个盒子由n块挡板分成n+1块区域,有m个玩具,每次给出一个玩具的坐标,最后输出各个区域玩具的数量,玩具不会在线上或者盒子外面,挡板也不会相交.输出格式请看样例! 思路:考察叉积的性质,用一个结构体存线段(两个点共4个坐标),然后输入一个玩具坐标就遍历所有的区域找到然后对应区域加1. 这题看起来也不难,数据5000,开始想着用二分…

题目链接:https://cn.vjudge.net/problem/POJ-2318 题意 在一个矩形内,给出n-1条线段,把矩形分成n快四边形 问某些点在那个四边形内 思路 二分+判断点与位置关系 提交过程 WA*n x1和x2,y1和y2在复制的时候没分清(哭 WA 可能存在二分问题? AC 代码 #define PI 3.1415926 #include <cmath> #include <cstdio> #include <vector> #include &…

嘟嘟嘟 题面:先告诉你一个矩形抽屉的坐标,然后\(n\)个隔板将抽屉分成了\(n + 1\)格(格子从\(0\)到\(n - 1\)标号),接下来随机输入\(m\)个玩具的坐标.问最后每一个格子里有多少个玩具. 仔细想想就是一道计算几何入门题. 对于一个玩具\((x_0, y_0)\),我们只要找到在他的左面且离他最近的隔板\(i\),则这个玩具就在第\(i\)格里. 怎么判断隔板\(AB\)(规定\(A\)点是隔板的上端,\(B\)点是隔板下端)是否在玩具的左边?用叉积即可:只要\(\over…

http://poj.org/problem?id=2318 题目大意:给一个大矩形,分成n+1份,求落在每一份的点的数量. —————————————————— 首先叉积可以判断一个点在边界的左边还是右边(不写公式了) 然后边界题中给定按顺序读入,显然是可以二分的,于是二分之. 然后切了. #include<cstdio> #include<queue> #include<cctype> #include<cstring> #include<vect…

解题关键:计算几何入门题,通过叉积判断. 两个向量的关系: P*Q>0,Q在P的逆时针方向: P*Q<0,Q在P的顺时针方向: P*Q==0,Q与P共线. 实际就是用右手定则判断的. #include<cstdio> #include<cstring> #include<algorithm> #include<cstdlib> #include<cmath> #include<iostream> using namespa…

Mom and dad have a problem: their child, Reza, never puts his toys away when he is finished playing with them. They gave Reza a rectangular box to put his toys in. Unfortunately, Reza is rebellious and obeys his parents by simply throwing his toys in…

http://poj.org/problem?id=2318 第一次完全是$O(n^2)$的暴力为什么被卡了-QAQ(一定是常数太大了...) 后来排序了下点然后单调搞了搞..(然而还是可以随便造出让我的code变成$O(n^2)$的23333) #include <cstdio> #include <cstring> #include <cmath> #include <string> #include <iostream> #include…

http://poj.org/problem?id=2318 TOYS Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 10178   Accepted: 4880 Description Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child…

TOYS Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 8661   Accepted: 4114 Description Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child John never puts his toys away wh…

2318 TOYS 2398 Toy Storage 题意 : 给你n块板的坐标,m个玩具的具体坐标,2318中板是有序的,而2398无序需要自己排序,2318要求输出的是每个区间内的玩具数,而2318要求输出的是有 i 个玩具的区间有几个. 思路 : 两个题基本差不多,只不过2398排一下序,然后再找个数组标记一下就行. 这个题我一开始没想到用二分,判断了点在四边形内但是没写下去,然后看了网上的二分区间,利用叉积判断点在左边还是右边. 2318代码: #include <stdio.h> #…

TOYS 题意:给定一个如上的长方形箱子,中间有n条线段,将其分为n+1个区域,给定m个玩具的坐标,统计每个区域中的玩具个数. 思路:这道题很水,只是要知道会使用叉乘来表示点在线的上面还是下面: 当a.Xmult(b,c) < 0时,表示在线的上面.之后就是二分的时候,不能直接使用mid来ans[mid]++; 因为只是确定点在这条线的两边,到底是哪一边,具体还要用tmp来判断;(模板题) #include<iostream> #include<cstdio> #includ…

TOYS Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 10281   Accepted: 4924 Description Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child John never puts his toys away w…

C. Tanya and Toys 题目链接http://codeforces.com/contest/659/problem/C Description In Berland recently a new collection of toys went on sale. This collection consists of 109 types of toys, numbered with integers from 1 to 109. A toy from the new collectio…

Description In Berland recently a new collection of toys went on sale. This collection consists of 109 types of toys, numbered with integers from 1to 109. A toy from the new collection of the i-th type costs i bourles. Tania has managed to collect n …

题目: Description Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child John never puts his toys away when he is finished playing with them. They gave John a rectangular box to put his toy…

来源 poj 2318 Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child John never puts his toys away when he is finished playing with them. They gave John a rectangular box to put his toys in…

TOYS Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child John never puts his toys away when he is finished playing with them. They gave John a rectangular box to put his toys in, but J…

TOYS Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 16222   Accepted: 7779 Description Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child John never puts his toys away w…

题目链接:http://poj.org/problem?id=2398 Time Limit: 1000MS Memory Limit: 65536K Description Mom and dad have a problem: their child, Reza, never puts his toys away when he is finished playing with them. They gave Reza a rectangular box to put his toys in…

题目链接:http://poj.org/problem?id=2318 Time Limit: 2000MS Memory Limit: 65536K Description Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child John never puts his toys away when he is fin…

TOYS http://poj.org/problem?id=2318 Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 19301   Accepted: 9106 Description Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child…

TOYS Time Limit: 2000MS Memory Limit: 65536K Description Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child John never puts his toys away when he is finished playing with them. They g…

TOYS Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 10666   Accepted: 5128 Description Calculate the number of toys that land in each bin of a partitioned toy box.  Mom and dad have a problem - their child John never puts his toys away…

rt,计算几何入门: TOYS Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - their child John never puts his toys away when he is finished playing with them. They gave John a rectangular box to put his toy…

C. Tanya and Toys 题目连接: http://www.codeforces.com/contest/659/problem/C Description In Berland recently a new collection of toys went on sale. This collection consists of 109 types of toys, numbered with integers from 1 to 109. A toy from the new col…

题目链接:http://poj.org/problem?id=2318 题面: TOYS Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 17413   Accepted: 8300 Description Calculate the number of toys that land in each bin of a partitioned toy box. Mom and dad have a problem - the…

Calculate the number of toys that land in each bin of a partitioned toy box. 计算每一个玩具箱里面玩具的数量 Mom and dad have a problem - their child John never puts his toys away when he is finished playing with them. They gave John a rectangular box to put his toy…