做有挑战的事情,就从这里开始. 忘记这本书现在在哪儿了,以前还以为能祖祖辈辈留传,现在只能借助 Nowcoder 了.Now coder,Forever thinker. 想以自以为最优美的 code 来体现算法与数据结构的美. 题目:二维数组中的查找 题解:拿左下角 $(rowCount - 1, 0)$ 为起点,如果 $target >a[i][j]$,那么第 $0$ 列就无效了,小于的话,最后一行就无效了,就这样每次删除一行或者一列. 时间复杂度:$O(n + m)$ 注意:这题最暴力的做…

SQL> select TS# from v$tablespace where name='ABC' ; TS# ---------- 6 set serverout on set verify off set lines 200 set pages 2000 DECLARE v_ts_id number; not_in_awr EXCEPTION; v_ts_name varchar2(200) := UPPER('&Tablespace_Name'); v_ts_block_size n…

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…

FP - growth是一种比Apriori更高效的发现频繁项集的方法.FP是frequent pattern的简称,即常在一块儿出现的元素项的集合的模型.通过将数据集存储在一个特定的FP树上,然后发现频繁项集或者频繁项对.通常,FP-growth算法的性能比Apriori好两个数量级以上. FP树与一般的树结构类似,但它通过链接(Link)来连接相似元素,被连起来的元素项可以看成一个链表. 上图是一棵FP树,一个元素项可以在一棵FP树种出现多次,FP树的节点会存储项集的出现频率,每个项集会以路…

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…