ADACLEAN - Ada and Spring Cleaning


Ada the Ladybug has decided to do some "Spring Cleaning". As you might know, she keeps a TODO list. She is very sparing so she keeps all her activities as one string. You might get very confused while reading the string but she has a system - every activity has length exactly K characters. Sadly, as new activities were added to the list many duplicities appeared. Now it is time to find out how many unique activities are in her TODO list.

Input

First line contains T, number of test-cases.

Each test-case begins with N, K, 1 ≤ K ≤ N ≤ 105, length of string and length of activities respectively.

Next line consists of string of length N, consisting of lowercase letters.

The sum of lengths of strings among all test-cases won't exceed 3*105

Output

For each test-case, print the number of unique substrings of length K

Example Input

5
3 2
aaa
5 1
abcba
4 2
abac
10 2
abbaaaabba
7 3
dogodog

Example Output

1
3
3
4
4

hide comments
Khanh Ninh: 2017-01-04 04:22:30

Thank for the help ! I got AC :D

morass: 2017-01-03 21:58:53

@Khanh Ninh:
Hello,

it seems there is some "fail" with cleaning. You are failing on a testcase, but when executed on the testcase alone, you passed.

PS: (cleaning one array got me AC - so go for it :P )

Khanh Ninh: 2017-01-03 15:04:46

Hi, I'm having an unknown WA too, may you check the code? ID:18506949

morass: 2016-10-30 00:28:15

@Palashvijay4O: Good day to you - you are failing some "big" test-cases. Your answer are "lower" and when I change modulo the answers changes too.

So - maybe the algorithm is not bad (yet I can't be sure), yet you shall try "double hashing" instead [the probability of failure is much lesser]

But since the test-cases are too big, this is just my opinion :)

Have nice day & Good Luck!

Palashvijay4O: 2016-10-29 23:29:05

getting WA.. dont know what's the issue.
Id - 18058212
Please check once. TIA

morass: 2016-10-11 21:24:51

@asshole: Asctivities are not one after another - they overlap, so there are N-K+1 activities in a string :)

asshole: 2016-10-11 19:43:25

I don't understand the question. since each activity is of k length shouldn't there the string length be multiple of k?

mehmetin: 2016-09-11 16:19:23

Accepted with PYPY, but WA with C++14...

Vipul Srivastava: 2016-09-11 09:23:03

what is the expected complexity of the solution?

it_is_me: 2016-09-10 21:00:51

Getting WA constantly anybody can please provide me a good test case to check my solution.
Submission ID-17689065

Last edit: 2016-09-10 21:07:36

Added by:Morass
Date:2016-09-06
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ASM64 GOSU