static void BinaryMerge(Element[] a, Element[] b, Element[] c)
{
int n = a.Length;
int m = b.Length;
int power, elementsCount;
int totalLength = a.Length + b.Length;
int k;
while (n > 0 && m > 0)
{
power = (int)(Math.Log(n / m) / Math.Log(2));
elementsCount = 1 << power; /* elementsCount <-- 2^power */
if (m <= n)
{
if (b[m - 1].Key < a[n - elementsCount].Key)
{
/* Прехвърляне на a[n-t2-1],...,a[n] в изходната последователност */
totalLength -= elementsCount;
n = elementsCount;
for (int j = 0; j < elementsCount; j++)
c[totalLength + j] = a[n + j];
}
else
{
k = BinarySearch(a, n - elementsCount, n - 1, b[m - 1]);
for (int j = 0; j < n - k - 1; j++)
c[totalLength - n + k + j + 1] = a[k + j + 1];
totalLength -= n - k - 1;
n = k + 1;
c[--totalLength] = b[--m];
}
}
else
{
if (a[n - 1].Key < b[m - elementsCount].Key)
{
totalLength -= elementsCount;
m -= elementsCount;
for (int j = 0; j < elementsCount; j++)
{
c[totalLength + j] = b[m + j];
}
}
else
{
k = BinarySearch(b, m - elementsCount, m - 1, a[n - 1]);
for (int j = 0; j < m - k - 1; j++)
c[totalLength - m + k + j + 1] = b[k + j + 1];
totalLength -= m - k - 1;
m = k + 1;
c[--totalLength] = a[--n];
}
}
}
if (n == 0)
for (int i = 0; i < m; i++)
c[i] = b[i];
else
for (int i = 0; i < n; i++)
c[i] = a[i];
}
internal static void Main()
{
Element[] a = new Element[N];
Element[] b = new Element[M];
Element[] c = new Element[N + M];
InitializeArray(a, 200, 20);
InitializeArray(b, 200, 20);
Console.WriteLine("Преди сливането:");
Console.WriteLine("Масивът A:");
PrintArrays(a);
Console.WriteLine("Масивът B:");
PrintArrays(b);
BinaryMerge(a, b, c);
Console.WriteLine("След сливането C:");
PrintArrays(c);
}
private static int BinarySearch(Element[] elements, int left, int right, Element element)
{
do
{
int middle = (left + right) / 2;
if (elements[middle].Key < element.Key)
{
left = middle + 1;
}
else
{
right = middle - 1;
}
}
while (left <= right);
return right;
}
/* Извежда ключовете на масива на екрана */
private static void PrintArrays(Element[] list)
{
foreach (var element in list)
{
Console.Write("{0} ", element.Key);
}
Console.WriteLine();
}
private static void InitializeArray(Element[] array, int modul1, int modul2)
{
array[0].Key = Rand.Next() % modul1;
for (int i = 1; i < array.Length; i++)
{
array[i].Key = array[i - 1].Key + (Rand.Next() % modul2);
}
}
/* Проверява за възходящ ред */
private static void Check(Element[] elemets)
{
for (int i = 1; i < elemets.Length; i++)
{
Debug.Assert(elemets[i - 1].Key <= elemets[i].Key, "Wrong order");
}
}
/* Проверява за възходящ ред */
static void Check(Element[] elemets)
{
for (int i = 1; i < elemets.Length; i++)
Debug.Assert(elemets[i - 1].Key <= elemets[i].Key);
}