move elements from vector to unordered_set
#include <iostream>
#include <vector>
#include <unordered_set>
int main()
{
std::vector<int> input({ 1, 2, 2, 1, 3, 1, 4 });
std::unordered_set<int> set(input.begin(), input.end());
for (const int &i: set) {
std::cout << i << " ";
}
return 0;
}