/// <summary>
/// 返回对 n 个随机整数的数组进行一次 ThreeSum 所需的时间。
/// </summary>
/// <param name="n">随机数组的长度。</param>
/// <returns></returns>
public static double TimeTrial(int n)
{
var a = new int[n];
var random = new Random(DateTime.Now.Millisecond);
for (var i = 0; i < n; i++)
{
a[i] = random.Next(-MaximumInteger, MaximumInteger);
}
var timer = new Measurement.Stopwatch();
ThreeSum.Count(a);
return(timer.ElapsedTime());
}