#include <algorithm>
#include <iostream>
#include <vector>
int main()
{
std::vector<int> people = {5, 6,12, 3, 5, 9};
auto it = std::max_element(people.begin(), people.end());
std::cout << "largest element is " << *it << " at people[" << std::distance(people.begin(), it)
<< "]";
}
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