#include <algorithm>
#include <iostream>
#include <vector>

int main( ) {
   std::vector<int> a = { 2, 7, 1, 8, 6 };
   std::sort(&a[0], &a[0] + a.size( ));
   for (int i = 0; i < a.size( ); ++i) {
      std::cout << a[i] << " ";
   }
}