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A.cpp
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A.cpp
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#include<stdio.h>
int main()
{
unsigned long long int t,a,b,m,i,d;
scanf("%llu",&t);
while(t--)
{
scanf("%llu%llu",&a,&b);
d=1;
if(a==b)
printf("0\n");
else if(a>b)
{
if((a%b)!=0)
{
printf("-1\n");
}
else if((a/b)%2!=0)
printf("-1\n");
else
{
for(i=0;; i++)
{
if(d>a/b)
{
printf("-1\n");
break;
}
else if(d==a/b)
{
if(i%3==0)
{
printf("%llu\n",i/3);
break;
}
else
{
printf("%llu\n",(i/3)+1);
break;
}
}
else
d=2*d;
}
}
}
else
{
if((b%a)!=0)
{
printf("-1\n");
}
else if((b/a)%2!=0)
printf("-1\n");
else
{
for(i=0;; i++)
{
if(d>b/a)
{
printf("-1\n");
break;
}
else if(d==b/a)
{
if(i%3==0)
{
printf("%llu\n",i/3);
break;
}
else
{
printf("%llu\n",i/3+1);
break;
}
}
else
d=2*d;
}
}
}
}
return 0;
}