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  1. #include <iostream>
  2. #include <vector>
  3. #include <algorithm>
  4.  
  5. class punto
  6. {
  7. private:
  8.    int x;
  9.    int y;
  10. public:
  11.    punto() = default; // since you simply wanna initilize them
  12.    ~punto(){}
  13.    void setx(int xn){ x = xn;}
  14.    void sety(int yn) { y = yn; }
  15.  
  16.    bool operator<(const punto& obj)
  17.    {  return this->y < obj.y;  }
  18.    // define getters to access the private memebers
  19.    const int& getX()const { return x; }
  20.    const int& getY()const { return y; }
  21.    // overload operator<< to print the object of this class
  22.    friend std::ostream& operator<<(std::ostream& out, const punto& obj);
  23. };
  24. std::ostream& operator<<(std::ostream& out, const punto& obj)
  25. {  return out << obj.getX() << " " << obj.getY();  }
  26.  
  27.  
  28. int main()
  29. {
  30.    std::vector<punto> list;
  31.    int x, y, n;
  32.    punto p1;
  33.  
  34.    std::cin >> n;
  35.    for(int contador=0; contador<n; contador++)
  36.    {
  37.       std::cin >> x >> y;
  38.       p1.setx(x);
  39.       p1.sety(y);
  40.       list.push_back(p1);
  41.    }
  42.    std::cout <<"w.r.t Ys" <<std::endl;
  43.    // to sort w.r.t Ys: simply std::sort()
  44.    std::sort(list.begin(), list.end());
  45.    // now you can print the objects like this
  46.    for(const punto& it: list)    std::cout << it << std::endl;
  47.  
  48.    std::cout <<"w.r.t Xs" <<std::endl;
  49.    // to sort w.r.t Xs: std::sort() with lambda
  50.    std::sort(list.begin(), list.end(),[](const punto& lhs, const punto& rhs)->bool
  51.                                        {  return lhs.getX() < rhs.getX(); });
  52.  
  53.    for(const punto& it: list)    std::cout << it << std::endl;
  54.  
  55.    return 0;
  56. }
  57.  
Success #stdin #stdout 0s 4520KB
comments (?)
stdin
copy 
6
2 1
5 8
7 3
0 1
7 0
1 1
stdout
copy 
w.r.t Ys
7 0
2 1
0 1
1 1
7 3
5 8
w.r.t Xs
0 1
1 1
2 1
5 8
7 0
7 3
https://ideone.com/axPtkQ
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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