|시간 제한||메모리 제한||제출||정답||맞은 사람||정답 비율|
|2 초||512 MB||11||10||10||90.909%|
You are given two strings s, and t. Count the number of substrings of s that contain t as a subsequence at least once.
Note that a substring and a subsequence both consist of characters from the original string, in order. In a substring, the characters must be contiguous in the original string, but in a subsequence, they are not required to be contiguous. In the string abcde, ace is a subsequence but not a substring.
If s is aa and t is a, then the answer is 3: [a]a, [aa], and a[a].
Each test case will consist of exactly two lines.
The first line will contain string s (1 ≤ |s| ≤ 105, s∈[a−z]*), with no other characters. The second line will contain string t (1 ≤ |t| ≤ 100, |t| ≤ |s|, t∈[a−z]* ), with no other characters.
Output a single integer, which is the number of substrings of s that contain t as a subsequence at least once.