Go: package main

import "fmt"

func main() {
	for {
		var x, y int
		fmt.Scanf("%d %d", &x, &y)
		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
		}
		fmt.Printf("%d %d\n", y, lcm/y)
	}
}

C++: #include <stdio.h>

int main(void){
	int x, y;
	int tx, ty;
	int gcd, lcm;

	while(scanf("%d %d", &x, &y) != EOF){
		tx = x;
		ty = y;
		int r;

		while((r = x % y) != 0){
			x = y;
			y = r;
		}

		gcd = y;
		lcm = tx /gcd * ty;

		printf("%d %d\n", gcd, lcm);
	}

	return 0;
}

C++: #include<stdio.h>
#include<string.h>
#include<math.h>
#include<vector>
using namespace std;
long long gcd(long long a,long long b)
{
    if(b==0)
		return a;
    else return gcd(b,a%b);
}
int main()
{
    long long a,b;
    while(scanf("%I64d%I64d",&a,&b)!=EOF)
	{
		printf("%I64d %I64d\n",gcd(a,b),a/gcd(a,b)*b);
	}
    return 0;
}

C++: #include<iostream>
using namespace std;
int main(){
    int  i,a,b,c;
    while(cin>>a>>b){
        if(a==b){
            cout<<a<<" "<<a<<endl;
        }
        else{
        if(a<b){
            i=b-a;
        }
        else{
            i=a-b;
        }
    for( int j=i;j>0;){
        if(a%i==0 && b%i==0){
            c=i;
            break;
        }
        i=i-2;
    }
    cout<<c<<" "<<a*b/c<<endl;
        }
    }
    return 0;
}

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

template<typename T>
T gcd(T a, T b) {
	while (a != 0) {
		if (a < b) { //to be a > b
			std::swap(a, b);
		}
		a = a % b;
	}
	return b;
}
template<typename T>
T lcm(const T& a, const T& b) {
	return a * b / gcd(a, b);
}

int main(int argc, char const* argv[])
{
	unsigned long a{}, b{};
	while (std::cin >> a >> b) {
		std::cout << gcd(a, b) << ' ';
		std::cout << lcm(a, b) << std::endl;
	}
	return 0;
}

C++: #include <iostream>
using namespace std;
#define MAX(a,b) (((a)>(b))?(a):(b))
#define MIN(a,b) (((a)<(b))?(a):(b))

int gcd(int x,int y){
    if (y==0)return x;
    return gcd(MIN(x,y), MAX(x,y) % MIN(x,y));
}

int lcm(int x,int y){
    return x * y / gcd(x,y);
}

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;

//最大公約数
int gcd(int a, int b)
{
    int r;
    while((r = a % b) != 0) 
    {
        a = b;
        b = r;
    }
    return b;
}


//最小公倍数
int lcm(int a, int b)
{
    return (a * b / gcd(a,b));
}



int main(){

int a,b;

while(cin >> a >> b){
    if(a == -1 or b == -1)  break;
   while(a <= 0 or b <= 0){
       cin >> a >> b;
   }
   if(a > 0 and b > 0){
        cout << gcd(a,b) << " "<< lcm(a,b)<< "\n";
    }
}

return 0;
}

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

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

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

int lcm(int a,int b){
	int max_common = gcd(a,b);
	return (a/max_common)*b;
}

int main(){
    long long a, b;

	while(scanf("%lld %lld",&a,&b)!=EOF){
		printf("%lld %lld\n",gcd(a,b),lcm(a,b));
	}

    return 0;
}

C++: #include <stdio.h> 
#include <algorithm>

typedef long long LL;

LL GCD(LL a, LL b){
	if (a<b) std::swap(a, b);
	LL lcm = a * b; 
	while (b != 0)  { 
		LL gcd = a % b; 
		a = b; 
		b = gcd; 
	} 
	return a;
}

int main(){
	LL a, b;
	while (~scanf("%lld%lld", &a, &b)){
		LL tmp = GCD(a, b);
		printf("%lld %lld\n", tmp, a*b/tmp);
	}
	return 0;
}

C++: #include <iostream>

using namespace std;

int gcd(int a, int b)
{
  if(b == 0) return a;
  return gcd(b, a%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>
#include <cstdio>
#include <cstdlib>

using namespace std;


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

int main()
{
	long a, b, d;

	while(cin >> a >> b){
		d = gcd(a,b);
		cout << d << " " << (a*b)/d << endl; 
	}
	
	return 0;
}

C++: #include<iostream>
using namespace std;
int main(){
  long long  a,b;
  while(cin>>a>>b){
    //Eucledean algorithm                                                                                                     
    long long c,d,r,GCD,LCM;
    c=a;d=b;
    do{
      r=c%d;
      c=d;d=r;
    }while(r);
    GCD=c;
    LCM=a*b/GCD;
    cout << GCD << ' ' << LCM <<endl;
  }
  return 0;
}

C++: #include<iostream>
#include<algorithm>
#include<stdio.h>
using namespace std;
int main(){
    long long a,b,i,f,j;
    while(cin>>a>>b){
    for(i=20000000;i>0;i--){
        if(a>=2000000000||b>=2000000000||a<1||b<1){
            break;
        }
        if(a%i==0&&b%i==0){
            f=a*b/i;
            cout<<i<<" "<<f<<endl;
                break;
        }
    }
    }
    return 0;
}

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

#define iota(i,n,b,s) for(int i=int(b);i!=int((b)+(s)*(n));i+=(s))
#define range(i,n,m) iota(i,(((n)>(m))?((n)-(m)+1):((m)-(n)+1)),(n),((n)>(m)?-1:1))
#define rep(i,n) iota(i,(n),0,1)

#define INF (1e9)
#define EPS (1e-9)
#define cons(a,b) (make_pair(a,b))
#define car(a) (a.first)
#define cdr(a) (a.second)
#define cadr(a) (car(cdr(a)))
#define cddr(a) (cdr(cdr(a)))
#define all(a) a.begin(), a.end()
#define trace(var) cerr<<">>> "<<#var<<" = "<<var<<endl;

typedef long long Integer;
typedef double Real;

template<class S, class T>
ostream& operator<<(ostream& os, pair<S,T> p) {
  os << '(' << car(p) << ", " << cdr(p) << ')';
  return os;
}

template<class T>
ostream& operator<<(ostream& os, vector<T> v) {
  os << v[0];
  for (int i=1, len=v.size(); i<len; ++i) os << ' ' << v[i];
  return os;
}

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

int main() {

  for (Integer a, b; cin >> a >> b, cin; ) {
    Integer x = max(a,b);
    Integer y = min(a,b);
    while (y > 0) {
      x %= y;
      Integer t = x;
      x = y;
      y = t;
    }
    //cerr << cons(a,b) << ' ' << cons(x, y) << endl;
    cout << x << ' ' << (a / x * b) << endl;
  }

  return 0;
}

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

int main(){
  bool is_prime[1000000];

  is_prime[0]=is_prime[1]=false;
  for(int i=2; i<1000000; i++){
    is_prime[i]=true;
  }

  for(int i=2; i*i<1000000; i++){
    if(is_prime[i]){
      for(int j=i*i; j<1000000; j+=i){
        is_prime[j]=false;
      }
    }
  }

  int n_prime[1000000];
  int cnt=0;

  for(int i=0; i<1000000; i++){
    if(is_prime[i]){
      cnt++;
    }
    n_prime[i]=cnt;
  }

  while(true){
    int n;
    cin >> n;

    if(cin.eof())
      break;

    cout << n_prime[n] << endl;
  }

  return 0;
}

C++: #include <iostream>

using namespace std;

typedef unsigned long long ull;

int main()
{
	ull a, b, t;
	while(!cin.eof())
	{
		cin >> a >> b;
		ull M = max(a, b);
		ull m = min(a, b);
		while(m != 0)
		{
			t = M % m;
			M = m;
			m = t;
		}

		printf("%llu %llu\n", M, a * b / M);
	}
}

C++: #include<stdio.h>
main(a,b){while(scanf("%d%d",&a,&b))printf("%d %d\n",__gcd(a,b),__gcd(a,b)*b);
}

C++: #include <iostream>
int gcd(int a, int b)
{
  while (1) {
    if (b == 0) {
      return a;
    }
    int temp = b;
    b = a % b;
    a = temp;
  }
}

int lcd(int a, int b)
{
  return a / gcd(a, b) * b;
}

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