java ac

import java.util.Scanner;

public class Sold_Out {

public static void main(String[] args){

Scanner scan = new Scanner(System.in);

int n = scan.nextInt();

int k = scan.nextInt();

if(n<3){

System.out.println(0);

return;

}

System.out.println(Math.max(k - 1, n - k) - 2);

}

}

Re: java ac

your programm works only because of weak tests.

for example: 3 1

your answer is 0, but the correct one is 1.

1 _ _

1 _ 3

1 2 3 -> there is 1 person from both sides and the distance to number 2 is equal, so in the worst case the person will hit vasya.

*Edited by author 13.01.2016 01:14*

*Edited by author 13.01.2016 01:14*