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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int lastDigit(long long int a,long long int b)
  5. {
  6. 	if(b==0)
  7. 	return 1;
  8. 	int ones=a%10;
  9. 	if(ones==0 or ones==1 or ones==5 or ones==6)
  10. 	return ones;
  11. 	long long int r=0;
  12. 	if(ones==4 or ones==9)
  13. 	{
  14. 		r=b%2;
  15. 		if(r==0)
  16. 		return (ones*ones)%10;
  17. 		if(r==1)
  18. 		return ones%10;
  19. 	}
  20. 	if(ones==2 or ones==8 or ones==3 or ones==7)
  21. 	{
  22. 		r=b%4;
  23. 		if(r==1)
  24. 		return ones;
  25. 		if(r==2)
  26. 		return (ones*ones)%10;
  27. 		if(r==3)
  28. 		return (ones*ones*ones)%10;
  29. 		if(r==0)
  30. 		return ones;
  31. 	}
  32. 	return r;
  33. }
  34.  
  35. int main()
  36. {
  37. 	int t{0};
  38. 	cin>>t;
  39. 	while(t)
  40. 	{
  41. 		long long int a,b;
  42. 		cin>>a>>b;
  43. 		cout<<lastDigit(a,b)<<"\n";
  44. 		--t;
  45. 	}
  46. 	return 0;
  47. }
Success #stdin #stdout 0s 4164KB
comments (?)
stdin 
2
3 10
6 2
stdout 
9
6
https://ideone.com/sm0NAZ
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
secret

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