public void TestQuickSort() {
var a = new int[16];
for (int i = 0; i < a.Length; i++) {
a[i] = StdRandom.Uniform(100);
}
StdOut.WriteLine(a);
Quick<int>.Sort(a);
StdOut.WriteLine(a);
var item4 = Quick<int>.Select(a, 9);
StdOut.WriteLine("item7 = {0}", item4);
}