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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main()
  4. {
  5. 	long long int i,t,n,a,q,b,mn,mx,ar[100005],ans;
  6. 	cin>>t;
  7. 	while(t--)
  8. 	{
  9. 		cin>>n>>q;
  10. 		for(i=1;i<n;i++)
  11. 		cin>>ar[i];
  12. 		for(i=3;i<n;i++)
  13. 		{
  14. 			ar[i]+=ar[i-2];
  15. 			//cout<<ar[i]<<"**"<<endl;
  16. 		}
  17. 		for(i=0;i<q;i++)
  18. 		{
  19. 			cin>>a>>b;
  20. 			if(a==b)
  21. 			{
  22. 				cout<<"UNKNOWN\n";
  23. 			}
  24. 			else if(abs(a-b)%2==0)
  25. 			{
  26. 				cout<<"UNKNOWN\n";
  27. 			}
  28. 			else
  29. 			{
  30. 				mx=max(a,b);
  31. 				mn=min(a,b);a=mn;b=mx;
  32. 				if(b==2)
  33. 				{
  34. 					cout<<ar[1]<<endl;
  35. 					continue;
  36. 				}
  37. 				if(a==1)
  38. 				{
  39. 					ans=ar[b-2]-ar[b-1];
  40. 				}
  41. 				else if(a==2)
  42. 				{
  43. 					ans=ar[b-2]-ar[b-1]-ar[a-1];
  44. 				}
  45. 				else
  46. 				ans=(ar[b-2]-ar[a-1])-(ar[b-1]-ar[a-2]);
  47. 				cout<<abs(ans)<<endl;
  48. 			}
  49. 		}
  50. 	}
  51. 	return 0;
  52. }
Success #stdin #stdout 0s 4320KB
comments (?)
stdin
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1
5 3
4 5 6 7
1 2
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4 1
stdout
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4
UNKNOWN
5
https://ideone.com/VvTKJv
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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