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  1. #include"bits/stdc++.h"
  2. using namespace std;
  3. #define FASTIO ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  4. #define int unsigned long long int
  5. #define mod 1000000007ull
  6. int32_t main()
  7. {
  8. 	FASTIO
  9. 	int t;
  10. 	cin>>t;
  11. 	while(t--)
  12. 	{
  13. 		int n,k,s=0ull;
  14. 		cin>>n>>k;
  15. 		if(n==0)
  16. 			s = (k*(k-1ull))%mod;
  17. 		else
  18. 		{
  19. 			if(k==1)
  20. 			s =  ((n*(n-1ull))%mod + n)%mod;
  21. 			else if(k%2==0)
  22. 			{
  23. 				int gf = n + k/2ull;
  24. 				s = ((gf*(gf-1ull))%mod + n)%mod;
  25. 			}
  26. 			else
  27. 			{
  28. 				int wf = n + k/2ull;
  29. 				s = (((wf*(wf+1ull))%mod - wf)%mod + (wf-n)%mod)%mod ;
  30. 			}
  31. 		}
  32.  
  33.  
  34. 		cout<<s<<'\n';
  35. 	}
  36. 	return 0;
  37. }
Success #stdin #stdout 0s 4368KB
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stdin
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1
259920000 698160001
stdout
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335257022
https://ideone.com/RH3J1i
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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