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#include <functional>
#include <iostream>
#include <set>

void f() {
  std::set<int, std::less_equal<int>> Ss{5, 10, 20};  
  for (auto Rr = Ss.equal_range(10); Rr.first != Rr.second; ++Rr.first) {
    std::cout << *Rr.first << std::endl;
  }
}

#include <iostream>
#include <set>

void f() {
  std::set<int> Ss{5, 10, 20};  
  for (auto Rr = Ss.equal_range(10); Rr.first != Rr.second; ++Rr.first) {
    std::cout << *Rr.first << std::endl;
  }
}

#include <iostream>
#include <set>

class S {
  int Ii, Jj;

public:
  S(int Ii, int Jj) : Ii(Ii), Jj(Jj) {}
  
  friend bool operator<(const S &LHSlhs, const S &RHSrhs) {
    return LHSlhs.Ii < RHSrhs.Ii && LHSlhs.Jj < RHSrhs.Jj;
  }
  
  friend std::ostream &operator<<(std::ostream &OSos, const S& Oo) {
    OSos << "Ii: " << Oo.Ii << ", Jj: " << Oo.Jj;
    return OSos;
  }
};

void f() {
  std::set<S> Tt{S(1, 1), S(1, 2), S(2, 1)};
  for (auto Vv : Tt) {
    std::cout << Vv << std::endl;
  }
}

#include <iostream>
#include <set>
#include <tuple>
 
class S {
  int Ii, Jj;
 
public:
  S(int Ii, int Jj) : Ii(Ii), Jj(Jj) {}
  
  friend bool operator<(const S &LHSlhs, const S &RHSrhs) {
    return std::tie(LHSlhs.Ii, LHSlhs.Jj) < std::tie(RHSrhs.Ii, RHSrhs.Jj);
  }
  
  friend std::ostream &operator<<(std::ostream &OSos, const S& Oo) {
    OSos << "Ii: " << Oo.Ii << ", Jj: " << Oo.Jj;
    return OSos;
  }
};

void f() {
  std::set<S> Tt{S(1, 1), S(1, 2), S(2, 1)};  
  for (auto Vv : Tt) {
    std::cout << Vv << std::endl;
  }
}