2529: [Poi2011]Sticks Time Limit: 10 Sec  Memory Limit: 128 MBSec  Special JudgeSubmit: 257  Solved: 133[Submit][Status][Discuss] Description Little Johnny was given a birthday present by his grandparents. This present is a box of sticks of various l…

题目链接 BZOJ2529 题解 要组成三角形,当且仅当最长边长度小于另两条边之和 我们就枚举最长边,另两条边当然是越大越好 我们将所有边排序,从小枚举并记录各个颜色的最长边 当枚举到当前边时,找到除了当前颜色外其它颜色最长边的最大值和次大值,检查一下加起来是否大于当前边长度 复杂度\(O(nlogn + nk)\) #include<algorithm> #include<iostream> #include<cstring> #include<cstdio&g…

Sticks bzoj-2529 Poi-2011 题目大意:给你n根木棒,每种木棒有长度和颜色,颜色共有k种,求满足条件的3根木棒使得这3根木棒颜色互不相同且可以围成三角形. 注释:$1\le n \le 10^6$,$1\le k\le 50$. 想法:我们这么想:假设当前木棍是满足题意的三根木棍中的最大者,那么剩下两根木棍一定是越大越好.所以,将所有木棍按长度排序,每次记录一下连续的三个长度不同的三根木棍,然后比较.知道有答案位置. 最后,附上丑陋的代码... ... #include <…

题目描述 给出若干木棍,每根木棍有特定的颜色和长度.问能否找到三条颜色不同的木棍构成一个三角形.(注意这里所说的三角形面积要严格大于0) 输入 第一行给出一个整数k(3<=k<=50),表示颜色的种数.这k种颜色被标号为1至k.接下来k行,第i+1描述颜色为i的木棍的信息.首先一个整数Ni(1<=Ni<=10^6)表示颜色为i的木棍的数量.接下来Ni个整数,表示这Ni根木棍各自的长度.所有木棍的长度<=10^9.总木棍数量<=10^6. 输出 你的程序应该仅输出一行如果…

POI2011题解 2214先咕一会... [BZOJ2212][POI2011]Tree Rotations 线段树合并模板题. #include<cstdio> #include<algorithm> using namespace std; int gi(){ int x=0,w=1;char ch=getchar(); while ((ch<'0'||ch>'9')&&ch!='-') ch=getchar(); if (ch=='-') w=0…

Search GO 说明:输入题号直接进入相应题目,如需搜索含数字的题目,请在关键词前加单引号 Problem ID Title Source AC Submit Y 1000 A+B Problem 10983 18765 Y 1036 [ZJOI2008]树的统计Count 5293 13132 Y 1588 [HNOI2002]营业额统计 5056 13607 1001 [BeiJing2006]狼抓兔子 4526 18386 Y 2002 [Hnoi2010]Bounce 弹飞绵羊 43…

题目链接 题意就是给你一堆线段,然后线段有长度和颜色,让你选三条组成一个三角形,这三条线段颜色不能一样 题解: 做法:贪心 首先按照长度给这些线段排序一遍 然后贪心的去选,对于已经选出来同种颜色的,就拿它去替换同种颜色 不然就替换最小的 这样都能为后面创造更多的选择 复杂度$O(n)$ #include <bits/stdc++.h> #define ll long long #define inf 0x3f3f3f3f #define il inline #define in(a) a=re…

BZOJ_2529_[Poi2011]Sticks_贪心 Description Little Johnny was given a birthday present by his grandparents. This present is a box of sticks of various lengths and colours. Johnny wonders if there are three sticks in the set he has been given that would…

Wooden Sticks Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 15564    Accepted Submission(s): 6405 Problem Description There is a pile of n wooden sticks. The length and weight of each stick a…

题意:给你n条线段依次放到二维平面上,问最后有哪些没与前面的线段相交,即它是顶上的线段 题解:数据弱,正向纯模拟可过 但是有一个陷阱:如果我们从后面向前枚举,找与前面哪些相交,再删除前面那些相交的线段,这样就错了 因为如果线段8与5,6,7相交了,我们接下来不能直接判断4,我们还要找7,6,5与之前哪些相交 #include<set> #include<map> #include<queue> #include<stack> #include<cmat…

补一发题解.. 整体二分这个东西,一开始感觉复杂度不是很靠谱的样子 问了po姐姐,说套主定理硬干.. #include<bits/stdc++.h> #define ll long long #define inf 1e9 #define N 300005 using namespace std; inline int read(){ ,f=;char ch=getchar(); ;ch=getchar();} *x+ch-';ch=getchar();} return x*f; } int…

http://acm.hdu.edu.cn/showproblem.php?pid=1455 http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=243 uva开头描述: 307 - Sticks Time limit: 3.000 seconds hduoj 开头描述: E - Sticks Time Limit:3000MS     Memo…

题意:n根木棍随意摆放在一个平面上,问放在最上面的木棍是哪些. 思路:线段相交,因为题目说最多有1000根在最上面.所以从后往前处理,直到木棍没了或者最上面的木棍的总数大于1000. #include<stdio.h> #include<string.h> #include<math.h> #include<iostream> using namespace std; ; ; int sgn(double x){ ; ) ; ; } struct point…

Wooden Sticks Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 21902   Accepted: 9353 Description There is a pile of n wooden sticks. The length and weight of each stick are known in advance. The sticks are to be processed by a woodworkin…

一定要注意位运算的优先级!!!我被这个卡了好久 判断线段相交模板题. 叉积,点积,规范相交,非规范相交的简单模板 用了“链表”优化之后还是$O(n^2)$的暴力,可是为什么能过$10^5$的数据? #include<cmath> #include<cstdio> #include<cstring> #include<algorithm> #define N 100005 using namespace std; struct Point { double x…

Codeforces Round #258 (Div. 2) Game With Sticks A. Game With Sticks time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output After winning gold and silver in IOI 2014, Akshat and Malvika want to hav…

RMQ+二分....枚举 i  ,找比 i 小的第一个元素,再找之间的第一个最大元素.....                   Sticks Problem Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 9338   Accepted: 2443 Description Xuanxuan has n sticks of different length. One day, she puts all her stick…

Pick The Sticks Time Limit: 15000/10000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 593    Accepted Submission(s): 193 Problem Description The story happened long long ago. One day, Cao Cao made a special order c…

Pick-up sticksTime Limit: 4000/2000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 2950 Accepted Submission(s): 1108 Problem DescriptionStan has n sticks of various length. He throws them one at a time on the floor in…

点击打开链接 Colored Sticks Time Limit: 5000MS   Memory Limit: 128000K Total Submissions: 27955   Accepted: 7403 Description You are given a bunch of wooden sticks. Each endpoint of each stick is colored with some color. Is it possible to align the sticks…

Sticks Problem's Link:   http://poj.org/problem?id=1011 Mean: http://poj.org/problem?id=1011&lang=zh-CN&change=true analyse: 爆搜,但是其中蕴含着很多剪枝. Time complexity: O(n^2) Source code:  // Memory Time // 1347K 0MS // by : Snarl_jsb // 2014-11-07-17.14 #i…

题意: 按顺序扔木棒,求出最上层的木棒是哪些. 解法: 由于最上层的木棒不超过1000个,所以用一个队列存储最上层的木棒,每次扔出一个木棒后,都与队列中的木棒一一判断,看此木棒是否在某一最上层的木棒的上面,即判线段是否相交(两次跨立实验),如果相交,则将那个被压的木棒抛出队列,最后再加入扔的这个木棒到队列中. 代码: #include <iostream> #include <cstdio> #include <cstring> #include <cstdlib…

题 题意 给你六根木棍的长度,熊需要头比身体短,大象需要头和身体一样,四肢要一样长,否则就是外星人.请你判断能组成哪一个. 分析 暴力,循环看一下每根有几根相同的,然后如果有四根都是有四根相同的&&有两根是有两根相同的||有六根是有六根相同的,那就是大象,如果出现有五根相同的,或者不满足上面大象的条件,但是有四根四根相同,那就是熊,其它情况就是外星人.当时是另一种做法.感觉现在的做法思路更简单. 代码 #include<stdio.h> #include<algorith…

Description George took sticks of the same length and cut them randomly until all parts became at most 50 units long. Now he wants to return sticks to the original state, but he forgot how many sticks he had originally and how long they were original…

Colored Sticks Time Limit: 5000MS   Memory Limit: 128000K Total Submissions: 28036   Accepted: 7428 Description You are given a bunch of wooden sticks. Each endpoint of each stick is colored with some color. Is it possible to align the sticks in a st…

Rikka with wood sticks Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 600    Accepted Submission(s): 169 Problem Description As we know, Rikka is poor at math. Yuta is worrying about this situa…

Sticks Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 1455 Description George took sticks of the same length and cut them randomly until all parts became at most 50 units long. Now he wants to…

题目传送门 题意:就是小时候玩的一种游戏,问有多少线段盖在最上面 分析:简单线段相交,队列维护当前最上的线段 /************************************************ * Author :Running_Time * Created Time :2015/10/26 星期一 15:37:36 * File Name :POJ_2653.cpp ************************************************/ #inclu…

题目传送门 /* 题意:若干小木棍,是由多条相同长度的长木棍分割而成,问最小的原来长木棍的长度: DFS剪枝:剪枝搜索的好题!TLE好几次,终于剪枝完全! 剪枝主要在4和5:4 相同长度的木棍不再搜索:5 若新的搜索连第一条都没组合出来,直接break: 详细解释:http://blog.csdn.net/lyy289065406/article/details/6647960 http://www.cnblogs.com/devil-91/archive/2012/08/03/2621787.…

http://poj.org/problem?id=2653 我很好奇为什么这样$O(n^2)$的暴力能过.... 虽然说这是加了链表优化的,但是最坏不也是$O(n^2)$吗...(只能说数据太弱...) 然后本题裸的判线段相交和点在直线上...(看了网上的标程,不判端点的情况都能过我也是醉了...) #include <cstdio> #include <cstring> #include <cmath> #include <string> #includ…