解题思路：
找规律
最大的最小公因数就是两数的差值
5 7 gcd=2
1 3 gcd=2
1 4 gcd=3
import java.util.Scanner;public class Main {public static void main(String[] args) {Scanner scan = new Scanner(System.in);long a = scan.nextLong();long b = scan.nextLong();long c = Math.abs(a - b);long k = 0;//逆推k = c - (a % c);System.out.println(k);}}
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