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  1. #include <iostream>
  2. #include <utility>
  3. #include <algorithm>
  4.  
  5. std::vector< std::pair<double,double> > unoccupied( const std::vector<double>& seq )
  6. {
  7.     constexpr double multiplier_after = 1.10 ;
  8.     constexpr double multiplier_before = 0.90 ;
  9.  
  10.     std::vector< std::pair<double,double> > result ;
  11.  
  12.     if( seq.size() > 1 && std::is_sorted( std::begin(seq), std::end(seq) ) )
  13.     {
  14.         double prev = seq.front() * multiplier_after ;
  15.         for( auto iter = ++std::begin(seq) ; iter != std::end(seq) ; ++iter )
  16.         {
  17.             double curr = *iter * multiplier_before ;
  18.             if( curr > prev ) result.emplace_back( prev, curr ) ;
  19.             prev = *iter * multiplier_after ;
  20.         }
  21.     }
  22.  
  23.     return result ;
  24. }
  25.  
  26. int main()
  27. {
  28.     for( const auto& p : unoccupied( { 2.0, 2.1, 2.13, 2.2, 3.5, 3.6, 3.9, 6.4, 7.0 } ) )
  29.         std::cout << '[' << p.first << '-' << p.second << "] " ;
  30.     std::cout << '\n' ;
  31. }
  32.  
Success #stdin #stdout 0s 3428KB
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[2.42-3.15] [4.29-5.76]
https://ideone.com/evSeRC
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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