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 Go (1.14.1) (judge verdict: Accepted)

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func nextInt() int {
	sc.Scan()
	i, e := strconv.Atoi(sc.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func min(a ...int) int {
	m := a[0]
	for i, v := range a {
		if i == 0 {
			continue
		}
		if m > v {
			m = v
		}
	}
	return m
}

func abs(n int) int {
	if n < 0 {
		return -n
	}
	return n
}

var sc = bufio.NewScanner(os.Stdin)

func main() {
	// Code for C - Candles
	var N, K int
	fmt.Scan(&N, &K)

	sc.Split(bufio.ScanWords)
	x := make([]int, N)
	for i := 0; i < N; i++ {
		x[i] = nextInt()
	}

	var l, r int
	var ans int = 1000000000
	for i := 0; i < N-K+1; i++ {
		l = x[i]
		r = x[i+K-1]
		ans = min(ans, abs(l)+abs(r-l), abs(r)+abs(r-l))
	}

	fmt.Println(ans)
}