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Saleh127

CF 1430C

Oct 11th, 2020
60
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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define test int t; cin>>t; for(int cs=1;cs<=t;cs++)
  5. int main()
  6. {
  7. ios_base::sync_with_stdio(0);
  8. cin.tie(0);cout.tie(0);
  9.  
  10. test
  11. {
  12. ll a,c,d,e,f,i,j,k,l;
  13. cin>>a;
  14. c=a;
  15. d=a-1;
  16. cout<<2<<endl;
  17.  
  18. for(i=0;i<a-1;i++)
  19. {
  20. cout<<d<<" "<<c<<endl;
  21. c=(c+d+1)/2;
  22. d=d-1;
  23. }
  24. }
  25.  
  26.  
  27. return 0;
  28. }
  29.  
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