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Main1461.java
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Main1461.java
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.StringTokenizer;
public class Main1461 {
public static void main(String[] args) throws NumberFormatException, IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine());
int N = Integer.parseInt(st.nextToken());
int M = Integer.parseInt(st.nextToken());
int[] arr= new int[N];
st = new StringTokenizer(br.readLine());
for(int i=0;i<N;i++) {
arr[i] = Integer.parseInt(st.nextToken());
}
Arrays.sort(arr);
int dist = 0;
if(Math.abs(arr[0])>Math.abs(arr[arr.length-1])) {
dist+=Math.abs(arr[0]);
for(int j=M;j<arr.length && arr[j]<0;j+=M) {
dist+=Math.abs(arr[j])*2;
}
for(int j=arr.length-1;j>=0 && arr[j]>0;j-=M) {
dist+=arr[j]*2;
}
}else {
dist+=Math.abs(arr[arr.length-1]);
for(int j=0;j<arr.length && arr[j]<0;j+=M) {
dist+=Math.abs(arr[j])*2;
}
for(int j=arr.length-1-M;j>=0 && arr[j]>0;j-=M) {
dist+=arr[j]*2;
}
}
System.out.println(dist);
}
}