Question

How to insert sum of all existing values in unordered set using C++

Answer 1

#include <iostream>  
#include <unordered_set>
#include <numeric>

using std::unordered_set;
using std::cout;
using std::endl;


void print(const unordered_set<int>& usset)
{
	for (const auto& element : usset) {
		cout << element << endl;
	}
	std::cout << std::endl;
}

int main()
{
	unordered_set<int> usset = { 1, 2, 3, 4, 5 };

	usset.insert(accumulate(usset.begin(), usset.end(), 0));

	print(usset);

	return 0;
}

/*
run:

1
2
3
4
5
15

*/

 

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