Many Equal Substrings

1000ms

262144K

Description:

You are given a string $$$t$$$ consisting of $$$n$$$ lowercase Latin letters and an integer number $$$k$$$.

Let's define a substring of some string $$$s$$$ with indices from $$$l$$$ to $$$r$$$ as $$$s[l \dots r]$$$.

Your task is to construct such string $$$s$$$ of minimum possible length that there are exactly $$$k$$$ positions $$$i$$$ such that $$$s[i \dots i + n - 1] = t$$$. In other words, your task is to construct such string $$$s$$$ of minimum possible length that there are exactly $$$k$$$ substrings of $$$s$$$ equal to $$$t$$$.

It is guaranteed that the answer is always unique.

Input:

The first line of the input contains two integers $$$n$$$ and $$$k$$$ ($$$1 \le n, k \le 50$$$) — the length of the string $$$t$$$ and the number of substrings.

The second line of the input contains the string $$$t$$$ consisting of exactly $$$n$$$ lowercase Latin letters.

Output:

Print such string $$$s$$$ of minimum possible length that there are exactly $$$k$$$ substrings of $$$s$$$ equal to $$$t$$$.

It is guaranteed that the answer is always unique.

Sample Input:

3 4
aba

Sample Output:

ababababa

Sample Input:

3 2
cat

Sample Output:

catcat

Informação

Provedor Codeforces

Código CF1029A