Go: package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func gcd(num1, num2 int) int {
	if num2 == 0 {
		return num1
	}
	num3 := num1 % num2
	return gcd(num2, num3)
}

func lcm(num1, num2 int) int {
	if num1%num2 != 0 {
		num3 := gcd(num1, num2)
		for i := 1; ; i++ {
			check := num3 * i
			if check%num1 == 0 && check%num2 == 0 {
				return check
			}
		}
	} else {
		return num1
	}
}

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		row := strings.Fields(scanner.Text())
		nums := []int{}

		for _, v := range row {
			num, _ := strconv.Atoi(v)
			nums = append(nums, num)
		}
		fmt.Println(gcd(nums[0], nums[1]), lcm(nums[0], nums[1]))
	}
}

C++: #include <iostream>
using namespace std;

long long int gcd(long long int a, long long int b) {
	if (b == 0)
		return a;
	return gcd(b, a%b);
}

int main() {
	long long int a, b;
	while (cin >> a >> b) {
		long long int g = gcd(max(a, b), min(a, b));
		long long int l = a * b / g;

		cout << g << " " << l << endl;
	}
	return 0;
}

C++: import sys
 
def gcd(inta, intb):
    large = max(inta, intb)
    small = min(inta,intb)
    mod = large % small
    if mod ==0:
        return small
    else:
        return gcd(small, mod) 
     
def lcm(inta, intb, intgcd):
    return (inta * intb // intgcd)
 
sets = sys.stdin.readlines()
for line in sets:
    a, b = map(int, line.split())
    c = gcd(a, b)
    print(c, lcm(a, b, c))

C++: #include<bits/stdc++.h>
using namespace std;

// dependency
long long gcd(long long a, long long b) {
    if (b == 0) return a;
    return gcd(b, a % b);
}

long long lcm(long long a, long long b) {
    long long g = gcd(a, b);
    return a / g * b;
}

/*
    verified https://onlinejudge.u-aizu.ac.jp/problems/ALDS1_1_B
*/
int main() {
    long long a, b;
    while (cin >> a >> b) {
        long long g = gcd(a, b);
        long long l = lcm(a, b);
        cout << g << " " << l << endl;
    }
}

C++: #include<iostream>

using namespace std;

int main(){
	int a,b,c,d;
	cin >> a >> c;
	b=a; d=c;
	while(b!=d){
		if(d<b){d+=c;}
		else b+=a;
			}
	cout << b << '\n';
}

C++: #include <iostream>
using namespace std;

int GCD(int a, int b)
{
    int asw = 1;
    int tmp;
    if (a > b) {
        while (b >= asw) {
            if (!(b % asw) && !(a % asw))
                tmp = asw;
            asw++;
        }
    } else {
        while (a >= asw) {
            if (!(b % asw) && !(a % asw))
                tmp = asw;
            asw++;
        }
    }
    return tmp;
}

int LCM(int a, int b)
{
    int asw;
    if (a < b) {
        asw = b;
        while (asw % a)
            asw += b;
    } else {
        asw = a;
        while (asw % b)
            asw += a;
    }
    return asw;
}

int main()
{
    int a, b;
    while ((cin >> a >> b)) {
        cout << GCD(a, b) << ' ' << LCM(a, b) << endl;
    }
}

C++: #include <iostream>
#include <cstdio>
using namespace std;

int gcd(int a, int b) {
    
  	longint p,q,r;
  	if(a>b){p=b;b=a;a=p;}
	while(r!=0){
	q=b/a;
	r=b%a;
	b=a;
	a=r;
	}
	return b;
}

int main(void){
    longint a, b;
    while(cin >> a >> b) {
      longint lcm = a/gcd(a,b)*b;
      cout << gcd(a,b) << " " << lcm << endl;
    }
    return 0;
}

C++: #include <iostream>
#include <algorithm>
#define ll long long
using namespace std;

int gcd(int a, int b)
{
    if(b == 0)
        return a;
    else
        return gcd(b, a%b);
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    
    ll a, b;
    while(cin >> a >> b)
    {
        if(a < b) swap(a, b);
        ll g, l;
        g = gcd(a, b);
        l = (a*b)/gcd(a, b);
        cout << g << " " <<  l << "\n";
    }
    return 0 ;
}

C++: #include <iostream>
#include <algorithm>
#include <cmath>

using namespace std;

long long int find_GCD(long long int a, long long int b){
  long long int max = 0;
  for(int i=min(a, b)/2+1;i>0;i--){
    if(a%i==0 && b%i==0){
      max = i;
      break;
    }
  }
  return max;
}

int main(){
  long long int a, b;
  while(cin >> a >> b){
    //    cout << a << " " << b <<endl;
    //    int GCD = find_GCD(a, b);
    //    cout << GCD << endl;
    //    cout << find_GCD(a, b) << endl;
    long long int GCD = find_GCD(a, b);
    long long int LCM = a*b/GCD;
    cout << GCD << " " << LCM << endl;
  }

}

C++: #include <bits/stdc++.h>
#define ll long long
using namespace std;

int gcd(ll a, ll b) {
    if(b==0)return a;
    return(gcd(b,a%b));
}

int main() {
    ll q,w;
    while(cin>>q>>w) {
        ll c = gcd(q,w);
        cout << c <<" "<<q*w/c <<endl;
    }
}

C++: #include<stdio.h>
int main(void)
{
	int a,b,aa,ba,i,x,y,bb;
	aa=1;
	ba=1;
	while(scanf("%d %d",&a,&b)!=EOF){
		x=a;
		y=b;
		if(b<a){
			while(1){
				if(aa==0){
					break;
				}
				aa=a%b;
				a=b;
				b=aa;
			}
			ba=x*y/a;
			printf("%d %d\n",a,ba);
		}
		else{
			while(1){
				if(aa==0){
					break;
				}
				aa=b%a;
				b=a;
				a=aa;
			}
			ba=x*y/b;
			printf("%d %d\n",b,ba);
		}
	}
}

C++: #include<iostream>
using namespace std;
int main(){
int a,b,g,x,y,L,i=0;
while(i>50){
cin>>a>>b;
a=x;b=y;
while(1){
  if(x<y){y-x;}
  else if(x>y){x-y;}
  else if(x==y){x=g;break;}
}
L=(a*b)/g;
  cout<<g<<" "<<L<<endl;
  ++i;
}
  return 0;
}

C++: #include<iostream>
#include<vector>
#include<algorithm>
#include<set>
#include<queue>
#include<string>
#include<cstdio>
#include<stack>
#include<cmath>
#include<bitset>
#include<memory>
#include<utility>
using namespace std;
#define FOR(i,m,n) for(i=m;i<n;i++)
#define CLR(a,b) memset(a,b,sizeof(a))
#define ROF(i,m,n) for(i=m;i>=n;i--)
#define BUG cout<<"debug"<<endl;
#define RT return
#define BK break
#define HEAP priority_queue
#define SP " "
#define lowf(a,b,c) lower_bound(a,b,c)
#define upf(a,b,c) upper_bound(a,b,c)
typedef long long LL;
typedef vector<int> VI;
const int INF = 2147483647;
const int NEN = -INF - 1;
const LL LINF = 9223372036854775807;
LL gcd(LL a, LL b)
{
	return b ? gcd(b, a%b):a;
}
int main()
{
	LL a, b,c;
	while (cin >> a >> b)
	{
		c = gcd(a, b);
		cout << c << " " << a*b / c << endl;
	}
    return 0;
}

C++: 
#include<iostream>
using namespace std;
int main(){
  long long  a,b,c,A,B;
  while(cin>>a>>b){
    A=a;
    B=b;
    while(b!=0){
      c=a%b;
      a=b;
      b=c;
    }
    cout<<a<<' '<<A/a*B<<endl;
  }
  
}

C++: #include <iostream>
using namespace std;

int func1(int a,int b){
    while(a != b){
        if(a>b)a-=b;
        else b-=a;
    }
    return a;
}

int func2(const int a,const int b){
    int a2=a,b2=b;
    while(a2 != b2){
        if(a2>b2)b2+=b;
        else a2+=a;
    }
    return a2;
}

int main(){
    int a,b;
    while(cin >> a >> b){
        cout << func1(a,b) << " " << func2(a,b) << endl;
    }
    return 0;
}

C++: #include<iostream>
#include<stdio.h>
#include<math.h>
using namespace std;

int gcd(int u, int v) {
  int r;
  while (0 != v) {
    r = u % v;
	u = v;
	v = r;
  }
  return u;
}

int main(){
	int a,b;
	double x;
	while(scanf("%d",&a)!=EOF){
		cin>>b;
	cout<<gcd(a,b)<<" ";
	x=(double)a*b;
	//cout<<x<<endl;
	if(a<b){
		int tmp = a;
		a = b;
		b = tmp;
	}
	printf("%0.0f\n",x/(double)gcd(a,b));
	}
    return 0;
}

C++: #include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main(){
    long long i,a,b,c,d,e;
    while(cin>>a>>b){
        if(a<b){
            i=b;
        }
        else{
            i=a;
        }
    for( long long j=i;j>0;i--){
        if(a%i==0 && b%i==0){
            c=i;
            break;
        }
    }
    e=a*b/c;
    cout<<c<<" "<<e<<endl;
    }
    return 0;
}

C++: #include<iostream>
#include<cstdio>
using namespace std;

int gcd(int u, int v)
{
  int r, z;

    if(v > u)
    {
      z = u;
      u = v;
      v = z;
    }

  while((r = u%v) != 0)
  {
    u = v;
    v = r;
  }    
  return v;  
}


int main(void)
{
  int a, b, z;

  while(scanf("%d %d", &a, &b))
  {      
    printf("%d %d\n", gcd(a,b), b/gcd(a,b)*a);
  }

  return 0;
}