Go: package main

import "fmt"

func main() {
	var gcdArr, lcmArr [50]int
	var count int
	for {
		var x, y int
		fmt.Scanf("%d %d", &x, &y)
		if count == 51 {
			break
		}
		if x < y {
			rep := x
			x, y = y, rep
		}
		gcd := x % y
		lcm := x * y
		for gcd != 0 {
			x, y, gcd = y, gcd, x%y
		}
		gcdArr[count] = y
		lcmArr[count] = lcm / y
		count++
	}
	for i := 0; i < count; i++ {
		fmt.Printf("%d %d\n", gcdArr[i], lcmArr[i])
	}
}

C++: #pragma GCC optimize("Ofast,unroll-loops")
#include<bits/stdc++.h>

using namespace std;
using Int = long long;
typedef pair<int,int> Pi; typedef pair<Int,Int> Pl;
constexpr int mod = 1e9+7;
constexpr int INF32 = numeric_limits<int>::max();
constexpr Int INF64 = numeric_limits<Int>::max();
#define END {cout<<ans<<'\n'; return 0;}
#define ALL(v) (v).begin(),(v).end()
#define fi first
#define se second
#define mp make_pair
#define eb emplace_back
#define Pr(t) priority_queue<t>
#define gPr(t) priority_queue<t,vector<t>,greater<t>>
#define V(t) vector<t>
#define rer(i,l,r) for(int(i)=(l); (i)<(r); ++(i))
#define rep(i,n) rer(i,0,n)
#define gnr(i,l,r) for(int (i)=(r)-1; (i)>=(l); --(i))
#define pri(a) cout<<(a)<<'\n'
#define pri2(a,n) {rep(i,n-1)cout<<a[i]<<' '; if(n)cout<<a[n-1]<<'\n';}
#define prip(p) cout<<(p).fi<<' '<<(p).se<<'\n'
template<class T> inline bool cmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool cmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

int n,m,_,x,y,q;
string s,sb;
bool ok;
char cf,cb;

int main(){
  cin.tie(nullptr); ios::sync_with_stdio(0);
  //cout<<fixed<<setprecision(20);
  
  while(cin>>n>>m){
    cout<<__gcd(n,m)<<' '<<n/__gcd(n,m)*m<<'\n';
  }
}

C++: #include<iostream>
using namespace std;
int GCD(int a,int b)
{int c,d;
if(a<b)
{d=a;
 a=b;
 b=d;
}
 while(b!=0)
 {c=a%b;a=b;b=c;
 }
 return a;
}
int LCM(int a,int b)
{
 return a/GCD(a,b)*b;
}
int main()
{int a,b;
 while(cin>>a>>b)
 {cout<<GCD(a,b)<<" "<<LCM(a,b)<<endl;
 }
 return 0;
}

C++: #include <iostream>
#include <math.h>

using namespace std;

/*
Runtime ErrorªN±éB
fTõðàÁÆVvÉB
»ÝÍO(n^2)ÈÌÅAÅª2000000000
*/

void solve(int a, int b) {
	int max_num = max(a,b);
	int gcj = 0;
	for (int i=0; i<max_num; i++) {
		if (a%i==0 && b%i==0)
			gcj = max(gcj, i);
	}
	int lcm = a*b/gcj;
	cout << gcj << " " << lcm << endl;
}

int main() {
	int a, b;
	while (cin >> a >> b) {
		solve(a,b);
	}
	return 0;
}

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


int gcd(int a, int b){ return a%b ? gcd(b, a%b) : b; }
int lcm(int a, int b){ return a/gcd(a,b)*b; }

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

C++: #include<iostream>

using namespace std;

//Euclidean algorithm
int gcd(long m, long n)
{
	long t;
	while (m != 0) {
		t = m, m = n % m, n = t;
	}
	return n;
}

//gcd(a, b) * lcm(a, b) = a * b
int lcm(long n, long m) {
	return n * m / gcd(n, m); 
}



int main(){
	long n, m;
	
	while(cin >> n >> m) {
		cout << gcd(n, m) << " " << lcm(n, m);
	}

	return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <sstream>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <cstring>
#include <climits>
#include <cfloat>
#include <string>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <bitset>
#include <algorithm>
#include <functional>
#include <utility>
#include <numeric>

using namespace std;

typedef unsigned int UI;
typedef long long LL;
typedef unsigned long long ULL;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int,int> PII;
typedef istringstream ISS;
typedef ostringstream OSS;

#define REP( i, m, n ) for ( int i = (int)( m ); i < (int)( n ); ++i )
#define EACH( v, c ) for ( auto &v : c )

#define ITER( c ) __typeof( (c).begin() )
#define IREP( c, it ) for ( ITER(c) it = c.begin(); it != c.end(); ++it )
#define ALL( c ) (c).begin(), (c).end()

#define PB( n ) push_back( n )
#define MP( a, b ) make_pair( ( a ), ( b ) )
#define EXIST( c, e ) ( (c).find( e ) != (c).end() )

#define fst first
#define snd second

#define DUMP( x ) cerr << #x << " = " << ( x ) << endl
#define DEBUG( x ) cerr << __FILE__ << ":" << __LINE__ << ": " << #x << " = " << ( x ) << endl

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

int main()
{
	cin.tie( 0 );
	ios::sync_with_stdio( false );

	LL a, b;
	
	while ( cin >> a >> b )
	{
		LL res1 = gcd( a, b );
		LL res2 = a * b / res1;

		cout << res1 << ' ' << res2 << endl;
	}

	return 0;
}

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

typedef long int lint;
typedef long long int llint;
typedef pair<int, int> pii;
typedef pair<int, string> pis;
typedef pair<long, long> pll;

#define EACH(i, c) for (__typeof((c).begin()) i = (c).begin(); i != (c).end(); ++i)
#define ALL(c) (c).begin(), (c).end()
#define FOR(i, s, e) for (int i = (s); i < (int)(e); ++i)
#define REP(i, n) FOR(i, 0, n)
#define endl "\n"
#define mod 1000000007
#define INF 100000000

const int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};

template<typename T>
void print(const std::vector<T>& v, char sep=' ') {
  for (int i = 0; i < (int)v.size(); i++) {
    if (i != 0) cout << sep;
    cout << v[i];
  }
  cout << endl;
}

int main()
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  int x, y;
  while (cin >> x >> y){
    int res = __gcd(x, y);
    cout << res << ' ' << max(x, y) / res * min(x, y) << endl;
  }
}

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

int gcd(int a, int b){
  //a < b ユークリッドの互除法
  if(a==0) return b;
  return gcd(b%a,a);
}

//lcm = a*b/gcd
int main(){
  int a,b;
  while(cin >> a >> b){
    int g = gcd(a,b);
    cout << g << " " << a/g *b << 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;
  while(scanf("%d %d", &a, &b) != EOF)
  {      
    printf("%d %d\n", gcd(a,b), b/gcd(a,b)*a);
  }
  return 0;
}

C++: /*
C++ ???????????????????????????????????¬??????
??????AOJ-ITP1??????????????????
*/
#define _USE_MATH_DEFINES

#include <iostream> // ?¨??????\??????
#include <fstream>  // ??????????????\??????
#include <string>   // ???????????¢???
#include <vector>   // ???????????????
#include <cmath>    // ??°??????
#include <iomanip>  // stream???????????¢???
#include <algorithm>// max??¢??°??????

using std::cin;
using std::cout;
using std::endl;
using std::string;
using std::vector;        // ????´???°????????????????????????
using std::fixed;         // ???????????????????¨???????????????????????????????
using std::setprecision;  // ?????°????°???°?????\???????????°????????????????????¨????????\???

long long gcd(long long b, long long c) {
	long long r = b % c;
	while (r!=0)
	{
		b = c;
		c = r;
		r = b%c;
	}
	return c;
}

int main() {
	long long a[2];
	long long tmp;
	long long GCD = 1;
	long long LCM = 1;
	while (cin >> a[0] >> a[1])
	{
		// ????????????????????????
		if (a[0] < a[1]) {
			tmp = a[0];
			a[0] = a[1];
			a[1] = tmp;
		}
		else {}
		// ?????§??¬?´???°????¨????
		GCD = gcd(a[0], a[1]);

		// ????°???¬?????°????¨????
		LCM = a[0] * a[1] / GCD;

		// ??????
		cout << GCD << " " << LCM << endl;
	}
	return 0;
}

C++: #include <stdio.h>
#include <iostream>
#include <math.h>

int u(int a, int b);
int l(int a, int b);

int main(){
  int a, b;
  int gcd, lcm;
  
  while(scanf("%d", &a)!=EOF){
    scanf("%d", &b);
    gcd = u(a, b);
    lcd = l(a, b);
    std::cout << a << " " << b << std::endl;
  }
  
  return 0;
}

int u(int a, int b){
  while(a==1 || b==1){
    if(a>=b){
      a %= b;
    }else{
      b %= a;
    }
  }
  
  if(a==1) return b;
  else     return a;
}

int l(int a, int b){
  int i = 2;
  
  while(1){
    if(a%i==0){
      if(b%i==0) return i;
      else i++;
    }else{
      i++;
    }
  }
}