A13278. Make k Equal

You are given the array $a$ consisting of $n$ elements and the integer $k \le n$ .

You want to obtain at least $k$ equal elements in the array $a$ . In one move, you can make one of the following two operations:

- Take one of the minimum elements of the array and increase its value by one (more formally, if the minimum value of $a$ is $mn$ then you choose such index $i$ that $a_i = mn$ and set $a_i := a_i + 1$ );
- take one of the maximum elements of the array and decrease its value by one (more formally, if the maximum value of $a$ is $mx$ then you choose such index $i$ that $a_i = mx$ and set $a_i := a_i - 1$ ).

Your task is to calculate the minimum number of moves required to obtain at least $k$ equal elements in the array.

The first line of the input contains two integers $n$ and $k$ ( $1 \le k \le n \le 2 \cdot 10^5$ ) — the number of elements in $a$ and the required number of equal elements.

The second line of the input contains $n$ integers $a_1, a_2, \dots, a_n$ ( $1 \le a_i \le 10^9$ ), where $a_i$ is the $i$ -th element of $a$ .

Print one integer — the minimum number of moves required to obtain at least $k$ equal elements in the array.