题目描述
A subsequence of a given sequence S consists of S with zero or more elements deleted. Formally, a sequence Z = z1z2…zk
is a subsequence of X = x1x2…xm if there exists a strictly increasing sequence < i1, i2,…, ik > of indices of X such that for all j = 1, 2,…, k, we have xij = zj. For example, Z = bcdb is a subsequence of X = abcbdab with corresponding index sequence < 2, 3, 5, 7 >.
Your job is to write a program that counts the number of occurrences of Z in X as a subsequence such that each has a distinct index sequence.
输入
The first line of the input contains an integer N indicating the number of test cases to follow. The first line of each test case contains a string X, composed entirely of lowercase alphabetic characters and having length no greater than 10,000. The second line contains another string Z having length no greater than 100 and also composed of only lowercase alphabetic characters. Be assured that neither Z nor any prefix or suffix of Z will have more than 10100 distinct occurrences in X as a subsequence.
输出
For each test case, output the number of distinct occurrences of Z in X as a subsequence.
Output for each input set must be on a separate line.
样例输入
2
babgbag
bag
rabbbit
rabbit
样例输出
5
3
参考代码
暂无
解析
暂无
