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  1. #include <algorithm>    // for std::set_difference(), std::sort()
  2. #include <iostream>     // for std::cout, std::endl
  3. #include <iterator>     // for std::inserter
  4. #include <string>       // for std::string
  5. #include <vector>       // for std::vector
  6. using namespace std;
  7.  
  8. void print(const char* name, const vector<string>& v);
  9.  
  10. int main() 
  11. {
  12.     // Input vectors
  13.     vector<string> a = {"the", "of"};
  14.     vector<string> b = {"oranges", "the", "of", "apples"};
  15.  
  16.     print("a", a);
  17.     print("b", b);
  18.  
  19.     // Sort the vectors before calling std::set_difference().
  20.     sort(a.begin(), a.end());
  21.     sort(b.begin(), b.end());
  22.  
  23.     // Resulting difference vector
  24.     vector<string> c;
  25.     set_difference(a.begin(), a.end(),
  26.                    b.begin(), b.end(),
  27.                    inserter(c, c.begin()));
  28.  
  29.     print("difference(a,b)", c);
  30. }
  31.  
  32.  
  33. void print(const char* name, const vector<string>& v) 
  34. {
  35.     cout << name << " = {";
  36.     bool first = true;
  37.     for (const auto& s : v) 
  38.     {
  39.         if (first) 
  40.         {
  41.             first = false;
  42.             cout << s;
  43.         } 
  44.         else 
  45.         {
  46.             cout << ", " << s;
  47.         }
  48.     }
  49.     cout << "}" << endl;
  50. }
  51.  
Success #stdin #stdout 0s 3436KB
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stdin
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Standard input is empty
stdout
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a = {the, of}
b = {oranges, the, of, apples}
difference(a,b) = {}
https://ideone.com/1bAaZx
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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