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  1. #include <iostream>
  2. #include <iterator>
  3. #include <vector>
  4. #include <algorithm>
  5.  
  6. template <class InputIterator1, class InputIterator2,
  7.           class OutputIterator>
  8.   OutputIterator merge_alternately ( InputIterator1 first1, InputIterator1 last1,
  9.                                      InputIterator2 first2, InputIterator2 last2,
  10.                                      OutputIterator result)
  11.  {
  12.         size_t ct(0);
  13.         while(first1 != last1
  14.           and first2 != last2)
  15.                 *result++ = (++ct % 2 ? *first1++ : *first2++);
  16.  
  17.         std::copy(first1, last1, result);
  18.         std::copy(first2, last2, result);
  19.  
  20.         return result;
  21.  }
  22.  
  23. int main()
  24. {
  25.  
  26.         std::vector<int> const a{1, 2, 3, 4, 5,},
  27.                                b{6, 7, 8, 9, 10};
  28.         std::vector<int>       c;
  29.  
  30.         merge_alternately(a.begin(), a.end(),
  31.                           b.begin(), b.end(),
  32.                           std::back_inserter(c));
  33.  
  34.         std::copy(c.begin(), c.end(), std::ostream_iterator<int>(std::cout, ", "));
  35. }
Success #stdin #stdout 0s 3016KB
comments (?)
stdin 
Standard input is empty
stdout 
1, 6, 2, 7, 3, 8, 4, 9, 5, 10,
https://ideone.com/DMbF4
language:
C++14 (gcc 8.3)
created:
13 years ago
visibility:
public

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