GCD and LCM problem of begginer section

#include <stdio.h>
#include <string.h>

int main(void) {
int test,hcf, a, b, c, d;

scanf ("%d\n", &test);

while (test--) {  
	hcf = 0;
    scanf ("%d %d", &a, &b);
    c = a; 
    d = b;
    	if(a > b)
    		a -= b;
    		b -= a;
	hcf = a;
    printf("%d %d\n", hcf, (c*d)/hcf);
return 0;


this program of mine giving wrong answer but has been submitted correctly by other use in the solution section
what us the problem ?

Can you provide the link to Problem ??

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send a link to the problem please

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