static void Main(string[] args)
{
var n = 10000;
var trial = 100;
for (var i = 0; i < 3; i++)
{
var odds = new int[n];
var evens = new int[n];
var bst = new BSTAnalysis <int, int>();
for (var j = 100; j < n; j++)
{
evens[j] = j;
odds[j] = j + 1;
}
Shuffle(odds);
foreach (var item in odds)
{
bst.Put(item, item);
}
Console.WriteLine("n:" + n);
// hit
Shuffle(odds);
Test(bst, odds, trial, "hit");
// miss
Shuffle(evens);
Test(bst, evens, trial, "miss");
n *= 10;
}
}
static void Test(int n)
{
Console.Write(n + "\t");
var data = new double[n];
var random = new Random(n);
for (var i = 0; i < n; i++)
{
data[i] = random.NextDouble() * n;
}
var bst = new BSTAnalysis <double, int>();
var binarySearch = new BinarySearchSTAnalysis <double, int>();
foreach (var d in data)
{
binarySearch.Put(d, 1);
}
var binarySearchTime = (double)binarySearch.CompareAndExchangeTimes;
Console.Write(binarySearchTime + "\t");
foreach (var d in data)
{
bst.Put(d, 1);
}
var binaryTreeTime = (double)bst.CompareTimes;
Console.Write(binaryTreeTime + "\t");
Console.WriteLine(binarySearchTime / binaryTreeTime);
}
static void Test(BSTAnalysis <int, int> bst, int[] testCases, int trials, string label)
{
var testRecords = new long[trials];
for (var j = 0; j < trials; j++)
{
bst.CompareTimes = 0; // reset
bst.Get(testCases[j]); // test
testRecords[j] = bst.CompareTimes; // record
}
var testAverage = 0d; // 'd' for double
foreach (var record in testRecords)
{
testAverage += record;
}
testAverage /= testRecords.Length;
var testStandardDeviation = 0d;
foreach (var record in testRecords)
{
testStandardDeviation += (record - testAverage) * (record - testAverage);
}
testStandardDeviation /= testRecords.Length;
testStandardDeviation = Math.Sqrt(testStandardDeviation);
// 2lnN + 2γ - 3
var expect = 2 * Math.Log(testCases.Length) + 2 * 0.5772156649 - 3;
Console.WriteLine(label + ": ActualAverage: " + testAverage + "\tExpectAverage: " + expect + "\tStandardDevitation:" + testStandardDeviation);
}
private long[] Test(int n)
{
var testCases = new long[n];
var testResult = new long[n];
for (var i = 0; i < n; i++)
{
testCases[i] = i;
}
Shuffle(testCases);
var bst = new BSTAnalysis <long, int>();
for (var i = 0; i < n; i++)
{
bst.CompareTimes = 0;
bst.Put(testCases[i], 1);
testResult[i] = bst.CompareTimes;
}
return(testResult);
}