题解HJ108 | #求最小公倍数#retainAll求并集

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        Integer x = in.nextInt();
        Integer y = in.nextInt();

        List<Integer> list1 = solve(x);
        List<Integer> list2 = solve(y);

        
        //求并集
        list1.retainAll(list2);

        int result = 1;

        for (int i = 0; i < list1.size(); i++) {
            result *= list1.get(i);
        }

        System.out.println(x * y / result);
    }

    //求所有质因数
    public static List<Integer> solve(int x) {
        List<Integer> result = new ArrayList<>();

        for (int i = 2; i <= x; i++) {
            if (x % i == 0) {
                result.add(i);
                x /= i;
                i--;
            }
        }

        return result;
    }
}