感觉这题看了题解也不太懂。。
#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
int gcd(int a,int b)
{
int t;
if (a < b)
{
t=a;
a=b;
b=t;
}
if (b == 0)
return a;
else
return gcd(b,a%b);
}
bool check(int a,int b,int c)
{
int i;
if (a < b)
{
i=a;
a=b;
b=i;
}
if (c%a == 0)
return true;
for (i=c; i>=0; i-=a)
{
if (i%b == 0)
return true;
}
return false;
}
int main()
{
int prob,a,b,n,m,c;
scanf("%d",&prob);
while (prob--)
{
scanf("%d%d%d%d",&a,&b,&m,&n);
c=gcd(a,b);
if (m%c != 0 || n%c != 0)
{
printf("NO\n");
continue;
}
if ((m%a == 0 && n%b == 0) ||(m%b == 0 && n%a == 0))
{
printf("YES\n");
continue;
}
a/=c;
b/=c;
m/=c;
n/=c;
if (m%a == 0 && m%b == 0 && check(a,b,n) == true)
printf("YES\n");
else if (n%a == 0 && n%b == 0 && check(a,b,m) == true)
printf("YES\n");
else
printf("NO\n");
}
}