All in All

--------------------------------------------------------------------------------

Time limit: 1 Seconds Memory limit: 32768K
Total Submit: 2329 Accepted Submit: 763

--------------------------------------------------------------------------------
You have devised a new encryption technique which encodes a message by inserting between its characters randomly generated strings in a clever way. Because of pending patent issues we will not discuss in detail how the strings are generated and inserted into the original message. To validate your method, however, it is necessary to write a program that checks if the message is really encoded in the final string.
Given two strings s and t, you have to decide whether s is a subsequence of t, i.e. if you can remove characters from t such that the concatenation of the remaining characters is s.

Input

The input contains several testcases. Each is specified by two strings s, t of alphanumeric ASCII characters separated by whitespace. Input is terminated by EOF.

Output

For each test case output, print "Yes" if s is a subsequence of t or "No" if not.

Sample Input

sequence subsequence
person compression
VERDI vivaVittorioEmanueleReDiItalia
caseDoesMatter CaseDoesMatter

Sample Output

Yes
No
Yes
No

/*英语好的帮忙翻译一下,谢了*/

Ones

--------------------------------------------------------------------------------

Time limit: 1 Seconds Memory limit: 32768K
Total Submit: 1799 Accepted Submit: 854

--------------------------------------------------------------------------------

Given any integer 0 <= n <= 10000 not divisible by 2 or 5, some multiple of n is a number which in decimal notation is a sequence of 1's. How many digits are in the smallest such a multiple of n?

Sample Input

3
7
9901

Sample Output

3
6
12

/*给出一个不能被2和5整除的数,问这个数可以被最少的几个1组成的数整除*/

只要理解(a*b)%c==(a%c*b)%c.就可以了.

/*给出一个不能被2和5整除的数,问这个数可以被最少的几个1组成的数整除*/
比如是3.当然是111(最少要3个1组成的数)可以整除3了.
再比如7.那就输出111111.(因为111111是由1组成数中可以整除7的最小数).

关于这个题目,想到一个理解方法就是小学的除法运算.
大家都知道,当不够位除时,后总补0除,我们这里当然也可以补1除了.这样得出的结果不就是由1组成的数了.

把数组开大点.

这个绝对不对.因为它的测试里可能有几千位.掌握我前面的提示就理解不需要这样.