CollectionBalls.java

import java.io.BufferedReader;
import java.io.InputStreamReader;
 
public class Main {
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String l1 = br.readLine();
        String l2 = br.readLine();
        int n = Integer.parseInt(l1);
        int k = Integer.parseInt(l2);
        String l3 = br.readLine();
        String[] l3array = l3.split(" ");
        int sum = 0;
        for(int i = 0; i < l3array.length; i++) {
            int la = Math.abs(Integer.parseInt(l3array[i]));
            int lb = Math.abs(Integer.parseInt(l3array[i]) - k);
            if(la - lb > 0) {
                sum += lb * 2 ;
            } else {
                sum += la * 2;
            }
        }
        System.out.println(sum);
    }
}

AtCoder Beginners Contest 74

• B - Collecting Balls (Easy Version)