Chef and Array and K

All submissions for this problem are available.
Read problems statements in Mandarin Chinese, Russian and Vietnamese as well.
Chef has an array A consisting of N integers. He also has an intger K.
Chef wants you to find out number of different arrays he can obtain from array A by applying the following operation exactly K times.
 Pick some element in the array and multiply it by 1
As answer could be quite large, print it modulo 10^{9} + 7.
Input
 The first line of the input contains an integer T denoting the number of test cases. The description of T test cases follows.
 The first line of each test case contains two space separated integers N, K as defined above.
 The second line contains N spaceseparated integers A_{1}, A_{2}, ..., A_{N} denoting the elements of the array.
Output
 For each test case, output a single line containing an integer corresponding to the number of different arrays Chef can get modulo 10^{9} + 7.
Constraints
 1 ≤ T ≤ 10
 1 ≤ N, K ≤ 10^{5}
 10^{6} ≤ A_{i} ≤ 10^{6}
Subtasks
 Subtask #1 (10 points) : N, K ≤ 10
 Subtask #2 (30 points) : N, K ≤ 100
 Subtask #3 (60 points) : N, K ≤ 10^{5}
Example
Input: 3 1 3 100 3 1 1 2 1 3 2 1 2 1 Output: 1 3 4
Explanation
Example case 1. Chef has only one element and must apply the operation 3 times to it. After applying the operations, he will end up with 100. That is the only array he will get.
Example case 2. Chef can apply operation to one of three elements. So, he can obtain three different arrays.
Example case 3. Note that other than applying operation to positions (1, 2), (1, 3), (2, 3), Chef can also apply the operation twice on some element and get the original.
In summary, Chef can get following four arrays.
[1, 2, 1] [1, 2, 1] [1, 2, 1] [1, 2, 1]
Author:  berezin 
Editorial  http://discuss.codechef.com/problems/CHEFARK 
Tags  berezin, easy, june16 
Date Added:  14102015 
Time Limit:  1 sec 
Source Limit:  50000 Bytes 
Languages:  C, CPP14, JAVA, PYTH, PYTH 3.6, PYPY, CS2, PAS fpc, PAS gpc, RUBY, PHP, GO, NODEJS, HASK, SCALA, D, PERL, FORT, WSPC, ADA, CAML, ICK, BF, ASM, CLPS, PRLG, ICON, SCM qobi, PIKE, ST, NICE, LUA, BASH, NEM, LISP sbcl, LISP clisp, SCM guile, JS, ERL, TCL, PERL6, TEXT, SCM chicken, PYP3, CLOJ, FS 
Comments
 Please login at the top to post a comment.
SUCCESSFUL SUBMISSIONS
Fetching successful submissions
HELP
If you are still having problems, see a sample solution here. 