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  1. #include<iostream>
  2. #define ll long long 
  3. using namespace std;
  4. int main()
  5. {
  6. 	ll arr[1001];
  7. 	ll brr[1001];
  8. 	ll mod= 1000000007;
  9. 	arr[1]=2;
  10. 	for (int i = 2; i < 1001; ++i)
  11. 	{
  12. 		arr[i]=arr[i-1]*2;
  13. 		arr[i]=arr[i]%mod;
  14. 	}
  15. 	brr[1]=1;
  16. 	for (int i = 2; i < 501; ++i)
  17. 	{
  18.  
  19. 		brr[i]=2*brr[i-1]+1;
  20. 		brr[i]=brr[i]%mod;	
  21. 	}
  22. 	int t;
  23. 	cin>>t;
  24. 	while(t--)
  25. 	{
  26. 		int n;
  27. 		cin>>n;
  28. 		for (int i = 0; i < n; ++i)
  29. 		{
  30. 			int c;
  31. 			cin>>c;
  32.  
  33. 		}
  34. 		if(n%2==0)
  35. 		{
  36. 			cout<<((arr[n-1]-(arr[n-2]+(n-2)))/2)%mod<<"\n";
  37. 		}
  38. 		else{
  39. 			cout<<arr[n-1]<<"\n";
  40. 		}
  41. 	}
  42.  
  43.  
  44.  
  45.  
  46.  
  47.  
  48. }
  49.  
  50.  
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  58.  
Success #stdin #stdout 0s 3144KB
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stdin
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stdout
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https://ideone.com/cIVMOe
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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