#include <iostream>
#include <algorithm>
#include <vector>
 
using namespace std;
 
int main() {
    vector<int> data = {5, 16, 4, 7};	
    vector<int> index(data.size(), 0);
    for (int i = 0 ; i != index.size() ; i++) {
        index[i] = i;
    }
    sort(index.begin(), index.end(),
        [&](const int& a, const int& b) {
            return (data[a] < data[b]);
        }
    );
    for (int i = 0 ; i != index.size() ; i++) {
        cout << index[i] << endl;
    }
    return 0;
}

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