Problem:
Score : 300 points

Problem Statement

There are N candles placed on a number line.
The i-th candle from the left is placed on coordinate x_i.
Here, x_1 < x_2 < ... < x_N holds.

Initially, no candles are burning.
Snuke decides to light K of the N candles.

Now, he is at coordinate 0.
He can move left and right along the line with speed 1.
He can also light a candle when he is at the same position as the candle, in negligible time.

Find the minimum time required to light K candles.

Constraints

1 \leq N \leq 10^5

1 \leq K \leq N

x_i is an integer.

|x_i| \leq 10^8

x_1 < x_2 < ... < x_N

Input

Input is given from Standard Input in the following format:

N K
x_1 x_2 ... x_N

Output

Print the minimum time required to light K candles.

Sample Input 1

5 3
-30 -10 10 20 50

Sample Output 1

40

He should move and light candles as follows:

Move from coordinate 0 to -10.

Light the second candle from the left.

Move from coordinate -10 to 10.

Light the third candle from the left.

Move from coordinate 10 to 20.

Light the fourth candle from the left.

Sample Input 2

3 2
10 20 30

Sample Output 2

20

Sample Input 3

1 1
0

Sample Output 3

0

There may be a candle placed at coordinate 0.

Sample Input 4

8 5
-9 -7 -4 -3 1 2 3 4

Sample Output 4

10

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.Scanner;

public class Main {
	  
	public static void main(String args[]) {
		    Scanner scanner = new Scanner(System.in);
		    
		    int N  = scanner.nextInt();
		    int K = scanner.nextInt();
		    
		    int[] rousoku = new int[N];
		    
		    for(int i = 0; i < N; i++) 
		    {
		    	rousoku[i] = scanner.nextInt();
		    }
		    
		    int min = rousoku[K-1] - rousoku[0]+(int)Math.abs(rousoku[0]);
		    for(int j = 0;  K + j <= N; j++ )
		    {
		    	if( rousoku[K+j-1] - rousoku[j]+(int)Math.abs(rousoku[j]) < min)
		    	{
		    		min =  rousoku[K+j-1] - rousoku[j]+(int)Math.abs(rousoku[j]);
		    	}
		    }
		    
		    System.out.println(min);
		    
		    scanner.close(); }
		  }