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  1. #include <iostream>
  2. #include <iterator>
  3. #include <numeric>
  4. #include <vector>
  5. #include <algorithm>
  6.  
  7. template <typename T>
  8. struct min
  9. {
  10. 	typedef T element_type;
  11.     min(int& min) : min_(min) { }
  12.     min& operator *() { return *this; }
  13.     min& operator=(const T& t)
  14.     {
  15.     	if (first_)
  16.             min_ = t, first_ = false;
  17.         else if (t < min_)
  18.             min_ = t;
  19.     }
  20.     min& operator++() { return *this; }
  21.     bool first_ = true;
  22.     T& min_;
  23. };
  24.  
  25. template <typename Iterator>
  26. struct skip_take
  27. {
  28. 	skip_take(Iterator i, size_t skip, size_t take = size_t(-1))
  29. 	  : i_(i), skip_(skip), take_(take)
  30. 	{ }
  31.     skip_take& operator *() { return *this; }
  32.     skip_take& operator=(const typename Iterator::element_type& t)
  33.     {
  34.         if (skip_ == 0 && take_)
  35.             *i_ = t;
  36.     }
  37.     skip_take& operator++()
  38.         { if (skip_) --skip_; else if (take_) --take_, ++i_; return *this; }
  39.     Iterator& i_;
  40.     size_t skip_, take_;
  41. };
  42.  
  43. int main()
  44. {
  45.     std::vector<int> numbers = { 10, 1, 43, 59, 78, 46, 63, 12 };
  46.  
  47.     int result;
  48.     std::adjacent_difference(numbers.begin(), numbers.end(),
  49.                              skip_take<min<int>>(min<int>(result), 1));
  50.  
  51.     std::cout << result << '\n';
  52. }
Success #stdin #stdout 0s 3272KB
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-51
https://ideone.com/t55UGU
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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