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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4. const int mod=1e9+7;
  5.  
  6. int gia_tri(int x,int y,int mod)
  7. {
  8. 	long long res=y;
  9. 	long long base=x;
  10. 	int gia_tri=1;
  11. 	while (res>0)
  12. 	{
  13. 		if(res%2==1)
  14. 		{
  15. 			gia_tri=gia_tri*base%mod;
  16. 		}
  17. 		base=base*base%mod;
  18. 		res/=2;
  19. 	}
  20. 	return gia_tri;
  21. }
  22.  
  23. int main()
  24. {
  25. 	long long A,sum;
  26. 	int N;
  27. 	cin>>A>>N;
  28. 	if(A==1)
  29. 	{
  30. 		cout<<(1+N)%mod;
  31. 	}
  32. 	else
  33. 	{
  34. 		long long tu=(gia_tri(A,N+1,mod)-1+mod)%mod;/// +mod de gia tri luon duong - VD: -3%7=7 hay 4%7=4 và (4+7)%7=4
  35. 		long long mau=(gia_tri(A-1,mod-2,mod))%mod;
  36. 		int dap_an=tu*mau%mod;
  37. 		cout<<dap_an;
  38. 	}
  39. }
  40.  
Success #stdin #stdout 0.01s 5272KB
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https://ideone.com/Kpjm8b
language:
C++ (gcc 8.3)
created:
4 hours ago
visibility:
secret

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