#include <cstdio>
#include <vector>
#include <ctime>

using namespace std;

#define forn(i, n) for (int i = 0; i < (int)(n); i++)

struct MyVector : vector<int> {
  int & operator[] ( int i ) {
    return at(i);
  }
};

int main() {
  int n = 1e8;
  MyVector x;
  x.resize(n);
  forn(i, n)
    x[i] = i;

  printf("time = %.2f [%d %d %d]\n", 1. * clock() / CLOCKS_PER_SEC,
    x[0], x[n/2], x[n]);
}