中缀表达式求值

A. 数组

B. 栈

C. 队列

D. 散列表

A. a+b+c*d

B. （a+B.*c+d

C. （a+B.*（c+D.

D. a+b*c+d

密码翻译

A、求子串 Seeking substring

B、联接 Concatenation

C、匹配 Matching

D、求串长 Seeking length

若串S1=‘ABCDEFG’, S2=‘9898’ ,S3=‘###’,S4=‘012345’,执行 concat(replace(S1,substr(S1,length(S2),length(S3)),S3),substr(S4,index(S2,‘8’),length(S2))) 注意：substr(S,i,j)是对字符串S的下标为i开始取j个字符，这里的下标是从0开始的(单选) If the string S1 = 'ABCDEFG', S2 = '9898', S3 = '###', S4 = '012345', execute concat (replace (S1, substr (S1, length (S2), length (S3)), S3), substr (S4, index (S2, '8'), length (S2))) Note substr (S, i, j) is the operation to take string S’s j characters from subscript i. Subscript here is starting from 0.（There is only one correct answer）

A、ABC###G0123

B、ABCD###2345

C、ABCD###1234

D、ABC###G2345

A、空串就是空白串“Empty string” is blank string.

B、空串是任意字符串的子串 Empty string is a substring of arbitrary string.

C、串只可以采用顺序存储，不可以采用链式存储 String only can be stored in sequential method and cannot be stored in linked method.

D、在C++标准中，char S[M]最多能表示长度为M的字符串 In C ++ standards, char S[M] can represent up to a string of length M.

A、串是字符的有限序列 String is a finite sequence of characters.

B、模式匹配是串的一种重要运算 Pattern matching is an important operation.

C、串是一种数据对象和操作都特殊的线性表 String is a linear list whose data objects and operations both special

D、空串是由空格构成的串 Empty string is a string consisting of spaces.

在字符{A, C, G, T}组成的DNA序列中，A和T、C和G是互补对。判断一个DNA序列中是否存在互补回文串（例如，ATCATGAT的补串是TAGTACTA，与原串形成互补回文串）。下面DNA序列中存在互补回文串的是：（多选） In the DNA sequences consisting of character {A, C, G, T}, A and T, C and G are complementary pairs. Judging whether there is a complementary palindrome sequence in a DNA sequence (e.g., ATCATGAT’s complement strings is TAGTACTA, it is complementary palindrome sequence with the original sequence). Which of the following DNA sequences have complementary palindrome string? （There are more than one answers.）

A、CTGATCAG

B、AATTAATT

C、TGCAACGT

D、CATGGTAC

E、GTACGTAC

F、AGCTAGCT