Problem: Example

Input

2
5 6
1000000000 2


Output

4
5 6
0 6
0 0
5 0
3
1000000000 0
0 2
999999999 0

Solution (in CPP):

Solution:
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;

ll extgcd(ll x,ll y,ll &a,ll &b){
  if(y==0){
    a=1;
    b=0;
    return x;
  }
  ll res=extgcd(y,x%y,b,a);
  b -= x/y*a;
  return res;
}

int main(){
  int Tc;
  cin>>Tc;
  while(Tc--){
    ll x,y,z,a,b;
    cin>>x>>y;
    z=extgcd(x,y,a,b);
    ll py=abs(a);
    ll px=abs(b);
    if(z<=50000){
      cout<<3<<endl;
      cout<<0<<' '<<0<<endl;
      if(x*py-y*px<0){
        cout<<x<<' '<<y<<endl;
        cout<<px<<' '<<py<<endl;
      }else{
        cout<<px<<' '<<py<<endl;
        cout<<x<<' '<<y<<endl;
      }
    }else{
      cout<<4<<endl;
      cout<<0<<' '<<0<<endl;
      cout<<x<<' '<<y-1<<endl;
      cout<<x/z<<' '<<y/z<<endl;
      cout<<x-1<<' '<<y<<endl;
    }
  }
  return 0;
}