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  1. #include <iostream>
  2. #include <utility>
  3.  
  4. template<unsigned... N> struct seq { typedef seq<N...> type; };
  5.  
  6. template<unsigned k, typename S>
  7. struct seek;
  8.  
  9. template<unsigned N0, unsigned... N>
  10. struct seek< 0, seq<N0, N...> >:
  11. 	std::integral_constant<unsigned, N0>
  12. {
  13. 	typedef seq<N...> after;
  14. 	enum { depth = 1 };
  15. };
  16.  
  17. template<unsigned N0, unsigned N1, unsigned... N>
  18. struct seek< 1, seq<N0, N1, N...> >:
  19. 	std::integral_constant<unsigned, N1>
  20. {
  21. 	typedef seq<N...> after;
  22. 	enum { depth = 1 };
  23. };
  24.  
  25. template<unsigned K, unsigned... N>
  26. struct seek< K, seq<N...> >:
  27. 	seek< K/2, typename seek< K - K/2-1, seq<N...> >::after >
  28. {
  29. 	enum {
  30. 		parent_0 = seek< K - K/2 -1, seq<N...> >::depth,
  31. 		parent_1 = seek< K/2, typename seek< K-K/2-1, seq<N...> >::after >::depth,
  32. 		depth = 1 + (parent_0<parent_1?parent_1:parent_0),
  33. 	};
  34. };
  35.  
  36. typedef seq<1,2,3,4,5> elements;
  37.  
  38. int main() {
  39. 	std::cout << seek<0, elements>::value << " in " << seek<0, elements>::depth <<  "steps\n";
  40. 	std::cout << seek<1, elements>::value << " in " << seek<1, elements>::depth <<  "steps\n";
  41. 	std::cout << seek<2, elements>::value << " in " << seek<2, elements>::depth <<  "steps\n";
  42. 	std::cout << seek<3, elements>::value << " in " << seek<3, elements>::depth <<  "steps\n";
  43. 	std::cout << seek<4, elements>::value << " in " << seek<4, elements>::depth <<  "steps\n";
  44. 	// your code goes here
  45. 	return 0;
  46. }
  47.  
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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1 in 1steps
2 in 1steps
3 in 2steps
4 in 2steps
5 in 3steps
https://ideone.com/4ZgVD4
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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