cpp set example

Example 1: set in cpp

#include<iostream>
#include<set>
 
using namespace std;
 
int main(){
 
    // Set with values
    set<int, greater<int>> s1 = {6, 10, 5, 1};
    // s1 = {10, 6, 5, 1}
 
    // Inserting elements in the set
    s1.insert(12);
    s1.insert(20);
    s1.insert(3);
 
    // Iterator for the set
    set<int> :: iterator it;
 
    // Print the elements of the set
    for(it=s1.begin(); it != s1.end();it++)
        cout<<*it<<" ";
    cout<<endl;
 
}

Example 2: set c++

// constructing sets
#include <iostream>
#include <set>

bool fncomp (int lhs, int rhs) {return lhs<rhs;}

struct classcomp {
  bool operator() (const int& lhs, const int& rhs) const
  {return lhs<rhs;}
};

int main ()
{
  std::set<int> first;                           // empty set of ints

  int myints[]= {10,20,30,40,50};
  std::set<int> second (myints,myints+5);        // range

  std::set<int> third (second);                  // a copy of second

  std::set<int> fourth (second.begin(), second.end());  // iterator ctor.

  std::set<int,classcomp> fifth;                 // class as Compare

  bool(*fn_pt)(int,int) = fncomp;
  std::set<int,bool(*)(int,int)> sixth (fn_pt);  // function pointer as Compare

  return 0;
}