Question

How to convert array to set in C++

Answer 1

#include <iostream>
#include <unordered_set>

int main()
{
	int arr[] = { 5, 7, 3, 2, 8 };
	std::unordered_set<int> st;
	
	for (int n: arr) {
		st.insert(n);
	}

	for (int n: st) {
		std::cout << n << " ";
	}
}



/*
run:

8 3 5 2 7 

*/

 

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Answer 2

#include <iostream>
#include <set>
 
int main()
{
    int arr[] = { 5, 7, 3, 2, 8 };
    std::set<int> st;
    
    for (int n: arr) {
        st.insert(n);
    }
 
    for (int n: st) {
        std::cout << n << " ";
    }
}
 
 
 
/*
run:
 
2 3 5 7 8  
 
*/

 

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Answer 3

#include <iostream>
#include <unordered_set>
 
template <size_t N> std::unordered_set<int> ConvertArray(int (&arr)[N]) {
    std::unordered_set<int> set;
    
    for (int val : arr) {
        set.insert(val);
    }
    
   return set;
}
 
int main() {
    int arr[] = { 3, 9, 0, 4, 7, 6, 2, 2, 2, 3 };
    std::unordered_set<int> set = ConvertArray(arr);
 
    for (int val : set) {
        std::cout << val << " ";
    }
}
 
 
 
 
/*
run:
 
2 6 7 4 0 9 3 
 
*/

 

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