Question

How to print unordered_set in C++

Answer 1

#include <iostream>
#include <bits/stdc++.h> 

using namespace std;

void print(unordered_set<int> const &us) {
	copy(us.begin(), us.end(), ostream_iterator<int>(cout, " "));
}

int main() 
{ 
    unordered_set<int> us;
    
    us.insert(3);
    us.insert(1);
    us.insert(12);
    
    print(us);
    
    return 0; 
} 



/*
run:

12 3 1 

*/

 

70+ SQL courses for beginners and professionals

Answer 2

#include <iostream>
#include <unordered_set>
#include <iterator>
 
void print(std::unordered_set<int> const &us) {
    std::copy(us.begin(),
            us.end(),
            std::ostream_iterator<int>(std::cout, " "));
}
  
int main()
{
    std::unordered_set<int> us = { 1, 5, 2, 7, 4, 9, 12 };
     
    print(us);
  
    return 0;
}
  
 
 
 
 
/*
run:
  
4 7 9 2 12 5 1 
  
*/

 

70+ SQL courses for beginners and professionals

Answer 3

#include <iostream>
#include <unordered_set>

void print(std::unordered_set<int> const &us) {
    for (auto const &n: us) {
        std::cout << n << " ";
    }
}
  
int main()
{
    std::unordered_set<int> us = { 1, 5, 2, 7, 4, 9, 12, 6, 3 };
     
    print(us);
  
    return 0;
}
  
 
 
 
 
/*
run:
  
3 6 9 4 7 2 5 12 1 
  
*/

 

70+ SQL courses for beginners and professionals