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  1. #include <iostream>
  2. #include <sstream>
  3. #include <vector>
  4. #include <utility>
  5.  
  6. typedef std::pair<int, int> point;
  7. typedef std::vector<point> points;
  8.  
  9. std::istream& operator>>(std::istream &in, point &out)
  10. {
  11.     char ch1, ch2, ch3;
  12.     if (in >> ch1 >> out.first >> ch2 >> out.second >> ch3)
  13.     {
  14.         if ((ch1 != '(') || (ch2 != ',') || (ch3 != ')')) 
  15.             in.setstate(std::ios_base::failbit);
  16.     }
  17.     return in;
  18. }
  19.  
  20. std::istream& operator>>(std::istream &in, points &out)
  21. {
  22.     point pt;
  23.     char ch;
  24.  
  25.     if (!(in >> ch))
  26.         return in;
  27.  
  28.     if (ch != '[')
  29.     {
  30.         in.setstate(std::ios_base::failbit);
  31.         return in;
  32.     }
  33.  
  34.     ch = in.peek();
  35.     do
  36.     {
  37.         if (ch == std::istream::traits_type::eof())
  38.         {
  39.             in.setstate(std::ios_base::failbit);
  40.             break;
  41.         }
  42.  
  43.         if (ch == ']')
  44.         {
  45.             in.ignore(1);
  46.             break;
  47.         }
  48.  
  49.         if (ch != '(')
  50.         {
  51.             in.setstate(std::ios_base::failbit);
  52.             break;
  53.         }
  54.  
  55.         if (!(in >> pt))
  56.             break;
  57.  
  58.         out.push_back(pt);
  59.  
  60.         ch = in.peek();
  61.         if (ch == ',')
  62.         {
  63.             in.ignore(1);
  64.             ch = in.peek();
  65.        }
  66.     }
  67.     while (true);
  68.  
  69.     return in;
  70. }
  71.  
  72. int main() {
  73. 	std::istringstream iss("[(1,2),(10,4),(5,12)]");
  74.     points coords;
  75.     iss >> coords;
  76.     for(auto &pt: coords)
  77.         std::cout << pt.first << ' ' << pt.second << std::endl;
  78. 	return 0;
  79. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/SLa78X
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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