24 Point game 时间限制:3000 ms  |  内存限制:65535 KB 难度:5   描述 There is a game which is called 24 Point game. In this game , you will be given some numbers. Your task is to find an expression which have all the given numbers and the value of the expression s…

24 Point game 时间限制:3000 ms  |  内存限制:65535 KB 难度:5 描写叙述 There is a game which is called 24 Point game. In this game , you will be given some numbers. Your task is to find an expression which have all the given numbers and the value of the expression s…

描述 There Point game. In .The expression mustn't have any other operator except plus,minus,multiply,divide and the brackets. e.g. If the numbers you are given is "3 3 8 8", you can give "8/(3-8/3)" as an answer. All the numbers should b…

String[] img = "FF D8 FF FE 00 24 47 00 9D 0C 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 F0 00 40 01 48 00 32 12 0B 51 04 51 04 00 00 FF DB 00 84 00 12 0C 0E 10 0E 0B 12 10 0F 10 14 13 12 15 1B 2D 1D 1B 19 19 1B 37 27 2A 21 2D 41 39 45 44 40 39 3F…

1.先贴一下气象数据的csv源格式,由于数据内容较多,就放一部分(china_sites_20150102.csv) date,hour,type,1001A,1002A,1003A,1004A,1005A,1006A,1007A,1008A,1009A,1010A,1011A,1012A,1013A,1014A,1015A,1016A,1017A,1018A,1019A,1020A,1021A,1023A,1024A,1025A,1026A,1027A,1028A,1029A,1030A,10…

The set [1,2,3,…,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order,We get the following sequence (ie, for n = 3): "123" "132" "213" "231" "312" "3…

最近在学习HTTP协议,看的书籍是<HTTP权威指南>,这本书讲的很不错,细节都讲的很透彻,虽然书本比较厚,因为讲的通俗易懂,所以比较有意思并不觉得枯燥.下面是读书后做的读书笔记. [图片未压缩,可以直接下载后查看大图.]由于是知识框架,所以图后会对一些小项做一些备注,方便大家阅读. 1.为什么要使用缓存? 缓存减少了冗余的数据传输,节省了网络服务商的网络费用. 缓存缓解了网络的性能瓶颈,使得更多的人可以高速的访问互联网. 缓存降低了对原始服务器的压力,服务器成本更低,可以为更多的请求响应.…

曲线拟合(转载:http://blog.sina.com.cn/s/blog_8e1548b80101c9iu.html) 补:拟合多项式输出为str 1.poly2str([p],'x') 2. fn=sprintf('%.16f%s%.16f%s%.16f%s%.16f',p(1),'*x^3+',p(2),'*x^2+',p(3),'*x+',p(4)); vpa(fn,精度) 补2:字符串拼接 1.STR=sprintf('%d%s.....',对应类型的值,对应类型的值); 2.str…

  导包     library(stringr) library(XML) library(maps) heritage_parsed <- htmlParse("http://en.wikipedia.org/wiki/List_of_World_Heritage_in_Danger",encoding ="UTF-8") 出现错误   Error: failed to load external entity " 网上查阅了相关的资料: htt…

文本函数 CHAR CHAR(number):根据指定数字返回对应的字符.CHAR函数可将计算机其他类型的数字代码转换为字符. Number:用于指定字符的数字,介于1Number:用于指定字符的数字,介于165535之间(包括1和65535). 示例: CHAR(88)等于“X”. CHAR(45)等于“-”. CODE CODE(text):计算文本串中第一个字符的数字代码.返回的代码对应于计算机使用的字符集. Text:需要计算第一个字符代码的文本或单元格引用. 示例: CODE("S&q…