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  1. #include <iomanip>
  2. #include <iostream>
  3. #include <string>
  4.  
  5. unsigned count_occurrences(const std::string& source, char terminal, const std::string& allowed)
  6. {
  7.     unsigned count = 0;
  8.     std::size_t offset = 0;
  9.     while ((offset = source.find(terminal, offset)) != std::string::npos)
  10.     {
  11.         std::size_t next_off = source.find_first_not_of(allowed, offset+1);
  12.         if (next_off != std::string::npos && source[next_off] == terminal)
  13.             ++count;
  14.  
  15.         offset = next_off; 
  16.     }
  17.  
  18.     return count;
  19. }
  20.  
  21. std::string quoted(const std::string& s)
  22. {
  23.     return '"' + s + '"';
  24. }
  25.  
  26. int main()
  27. {
  28.     std::string test_cases [] = 
  29.     { 
  30.         "+---", 
  31.         "---+ +---", 
  32.         "+--- ---+", 
  33.         "---+", 
  34.         "+--+--+", 
  35.         "+-+", 
  36.         "+--- +", 
  37.         "+ -+" 
  38.     };
  39.  
  40.     std::cout << std::left;
  41.     for (auto& test : test_cases)
  42.         std::cout << std::setw(15) << quoted(test) << count_occurrences(test, '+', "-") << '\n';
  43. }
Success #stdin #stdout 0s 3416KB
comments (?)
stdin
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Standard input is empty
stdout
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"+---"         0
"---+ +---"    0
"+--- ---+"    0
"---+"         0
"+--+--+"      2
"+-+"          1
"+--- +"       0
"+ -+"         0
https://ideone.com/DJMwuH
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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