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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. long long a[5]={1,1,2,6,4};
  4. long long mu2(long long n)
  5. {
  6. 	if(n%4==0)
  7. 	{
  8. 		return 6;
  9. 	}
  10. 	if(n%4==1)
  11. 	{
  12. 		return 2;
  13. 	}
  14. 	if(n%4==2)
  15. 	{
  16. 		return 4;
  17. 	}
  18. 	if(n%4==3)
  19. 	{
  20. 		return 8;
  21. 	}
  22. }
  23. long long cstc(long long n)
  24. {
  25. 	if(n<2){
  26. 	    return 1;
  27. 	}
  28. 	else
  29. 	{
  30. 	    return (mu2(n/5)*cstc(n/5)*a[n%5])%10;
  31. 	}
  32. 	return n;
  33. }
  34. int main() {
  35. 	ios_base::sync_with_stdio();cin.tie(0);
  36.     long long n;cin >>n;
  37. 	cout<<cstc(n);
  38. 	return 0;
  39. }
Success #stdin #stdout 0.01s 5528KB
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https://ideone.com/FrBMvW
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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