You are provided an input string S and the string “GEEKS” . Can you figure out all possible subsequence “GEEKS” in the string S ? You have to tell the number of ways in which the subsequence “GEEKS” can be formed from the string S.
The first line of input contains a single integer T, denoting the number of test cases. Then T test cases follow. Each test case consists of two lines. The first line of each test case conatins an integer N denoting the size of the string S. Second line of each test case consists of a string S of size N.
Corresponding to each test case, print in a new line, a number denoting the number of ways in which we can form the subsequence "GEEKS". Output the answer modulo 1000000007.
Input String contains only uppercase English Letters
In the first test case the input string is GEEKS itself so the number of ways is 1.
For the second case there are two K's. So a total of two possible strings can be formed by taking either of the two K's.
If you have purchased any course from GeeksforGeeks then please ask your doubt on course discussion forum. You will get quick replies from GFG Moderators there.