[프로그래머스]JAVA 최대공약수와 최소공배수

링크 : https://programmers.co.kr/learn/courses/30/lessons/12940

코딩테스트 연습 - 최대공약수와 최소공배수

import java.util.*;
import java.util.stream.IntStream;

class Solution {
    public int[] solution(int n, int m) {
        int[] answer;
        int small = Math.min(n, m);
        int max = Math.max(n, m);

        int gcd = getGCD(small, max);
        int lcm = getLCM(small, max, gcd);

        answer = new int[]{gcd, lcm};
        return answer;
    }
    
        public Integer getGCD(Integer small, Integer max){
        OptionalInt max1 = IntStream.range(1, small+1)
                .filter(x -> small % x == 0)
                .filter(x -> max % x == 0)
                .max();
        if(max1.isPresent()) return max1.getAsInt();
        return 0;
    }

    public Integer getLCM(Integer small, Integer max, Integer gcd){
        int sTime = small/gcd;
        int mTime = max/gcd;
        return sTime * mTime * gcd;
    }
}