【题解】解的个数

#include<cstdio>
#include<iostream>
using namespace std;
long long n,a,b,c,x1,x2,y1,y2,intemp;
long long sum;
int main()
{
    cin>>n;
    for(register int i=1;i<=n;++i)
    {
        sum=0;
        cin>>a>>b>>c>>x1>>x2>>y1>>y2;
        if(a==0&&b==0&&c==0)
        {
            sum=x2-x1+1;
            cout<<sum*(y2-y1+1)<<endl;
            continue;
        }
        for(register int j=x1;j<=x2;++j)
        {
            if(b==0)
            {
                if(-c-a*j==0) sum+=y2-y1+1;
            }
            else
            {
                intemp=(-c-a*j)/b;
                if(a*j+b*intemp+c==0&&(intemp>=y1&&intemp<=y2)) ++sum;
            }
        }
        cout<<sum<<endl;
    }
}