Chef and Way
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Read problems statements in Russian also.
After visiting a childhood friend, Chef wants to get back to his home. Friend lives at the first street, and Chef himself lives at the N-th (and the last) street. Their city is a bit special: you can move from the X-th street to the Y-th street if and only if 1 <= Y - X <= K, where K is the integer value that is given to you. Chef wants to get to home in such a way that the product of all the visited streets' special numbers is minimal (including the first and the N-th street). Please, help him to find such a product.
The first line of input consists of two integer numbers - N and K - the number of streets and the value of K respectively. The second line consist of N numbers - A1, A2, ..., AN respectively, where Ai equals to the special number of the i-th street.
Please output the value of the minimal possible product, modulo 1000000007.
- 1 ≤ N ≤ 10^5
- 1 ≤ Ai ≤ 10^5
- 1 ≤ K ≤ N
Input: 4 2 1 2 3 4. Output: 8
ScoringSubtask 1 (30 points): N <= 80
Subtask 2 (70 points): See the constraints.
|Tags||dynamic-programming, easy-medium, furko, ltime08|
|Time Limit:||1 sec|
|Source Limit:||50000 Bytes|
|Languages:||C, CPP14, JAVA, PYTH, PYTH 3.5, 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, CLOJ, FS|
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