大佬们到底是什么神仙错误是我卡了这么久啊QAQ

struct node{
    double x,y,dis;
}m[200010];
bool mmp(node m1,node m2)
{
    return m1.dis>m2.dis;
}
int main()
{
    cin>>n>>p>>q;
    kq=p/q;
    for(int i=0;i<n;i++)
    {
        cin>>m[i].x>>m[i].y;
        m[i].dis=m[i].y-kq*m[i].x;
    }
    sort(m,m+n,mmp);//Error
    .
    .
    .
}

error: invalid operands of types 'node [200010]' and 'double' to binary 'operator+'| 是我太菜了还是编译器恨我QwQ