地址:http://acm.split.hdu.edu.cn/showproblem.php?pid=6127 题目: Hard challenge Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 524288/524288 K (Java/Others)Total Submission(s): 813    Accepted Submission(s): 329 Problem Description There are n po…

平面上n个点,每个点带权,任意两点间都有连线,连线的权值为两端点权值之积.没有两点连线过原点.让你画一条过原点直线,把平面分成两部分,使得直线穿过的连线的权值和最大. 就把点极角排序后,扫过去,一侧的点会跨过直线与另一侧的所有点形成连线.此时的答案为两侧的权值和之积,尝试用此更新最终答案. #include<cstdio> #include<algorithm> using namespace std; typedef long long ll; struct Point{ ll…

HDU6121 Build a tree 题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=6121 题目意思:一棵 n 个点的完全 k 叉树,结点标号从 0 到 n - 1,求以每一棵子树的大小的异或和. 思路:一层一层的算,附上我的灵魂画作 我们来模拟计算一下上面这个非完全k叉树所有子树的大小异或之和. 对于第四层对于以该层节点为根的子树的大小为1,我们发现这一层总共有12个这样的子树,所以ans+=0: 对于第三层对于以该层节点为根的子树的大小为…

1. Intel Code Challenge Final Round (Div. 1 + Div. 2, Combined) B. Batch Sort    暴力枚举,水 1.题意:n*m的数组,每行最多可交换1次,列最多可交换两列,问最终是否可以变换到每行都是1~m. 2.总结:暴力即可. #include<bits/stdc++.h> #define F(i,a,b) for (int i=a;i<b;i++) #define FF(i,a,b) for (int i=a;i&l…

The Parallel Challenge Ballgame Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 547 Accepted Submission(s): 26 Problem DescriptionBefore the ACM/ICPC world final 2005, there is a competition called…

2295: [POJ Challenge]我爱你啊 Time Limit: 1 Sec  Memory Limit: 128 MB Description ftiasch是个十分受女生欢迎的同学,所以她总是收到许多情书.虽然她十分有魅力,然而她却是个低调的人.因此她从来不会告诉别人她到底收到了多少情书. ftiasch的好朋友1tthinking想知道她到底收到了多少情书.1tthinking知道,ftiasch每次收到一封情书,就会在日记最后写下一个包含"luvletter"子序列的…

 LCM Challenge Time Limit:1000MS     Memory Limit:64000KB     64bit IO Format:%lld & %llu Submit Status Practice ACdream 1077 Description Some days ago, I learned the concept of LCM (least common multiple). I've played with it for several times and I…

[codeforces 235]A. LCM Challenge 试题描述 Some days ago, I learned the concept of LCM (least common multiple). I've played with it for several times and I want to make a big number with it. But I also don't want to use many numbers, so I'll choose three…

这里有一篇文章,请阅读,感谢作者!http://blog.csdn.net/kmyhy/article/details/7733619 当请求的网站有安全认证问题时,都需要通过 [[challenge sender] useCredential:credential forAuthenticationChallenge:challenge]; 方法把相应的NSURLCredential对象注册到系统.…

Problem A. Poetry Challenge Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100500/attachments Description Let’s check another challenge of the IBM ICPC Chill Zone, a poetry challenge. One says a poetry string that starts with a…