private static void BuildingAHeap1(Data data)
{
for (int i = data._vector.Length / 2; i >= 0; i--)
{
heapify(data, i);
}
}
static void Main(string[] args)
{
Data data = new Data("Building a Heap.txt");
//data.Print();
//BuildingAHeap(data);
BuildingAHeap1(data);
//data.PrintVector();
data.PrintVectorToFile();
}
private static void BuildingAHeap(Data data)
{
//for (int i = 0; i < data._vector.Length / 2; i++)
for (int i = data._vector.Length - 1; i > 0; i--)
{
for (int j = i; j > 0; j--)
{
swim2(data, j);
}
//sink(data, i);
}
}
private static void swim1(Data data, int i)
{
int c = i;
int p = (c - 1) / 2;
while (c > 0 && (data._vector[p] < data._vector[c]))
{
int tmp = data._vector[c];
data._vector[c] = data._vector[p];
data._vector[p] = tmp;
c = p;
p = (c - 1) / 2;
}
}
private static bool swim2(Data data, int i)
{
int c = i;
int p = (c - 1) / 2;
//while (c > 0 && (data._vector[p] < data._vector[c]))
if (data._vector[p] < data._vector[c])
{
int tmp = data._vector[c];
data._vector[c] = data._vector[p];
data._vector[p] = tmp;
return true;
c = p;
p = (c - 1) / 2;
}
return false;
}
private static void heapify(Data data, int i)
{
int rightnode = 2 * i + 2;
int leftnode = 2 * i + 1;
int largest = i;
if (leftnode < data._vector.Length && data._vector[leftnode] > data._vector[largest])
largest = leftnode;
if (rightnode < data._vector.Length && data._vector[rightnode] > data._vector[largest])
largest = rightnode;
if (largest != i)
{
int tmp = data._vector[largest];
data._vector[largest] = data._vector[i];
data._vector[i] = tmp;
heapify(data, largest);
}
}
private static void swim(Data data, int i)
{
if (data._vector[(i - 1) / 2] < data._vector[i])
{
int tmp = data._vector[i];
data._vector[i] = data._vector[(i - 1) / 2];
data._vector[(i - 1) / 2] = tmp;
}
}
private static void sink(Data data, int k)
{
while (2 * k < data._vector.Length - 1)
{
int j = 2 * k + 1;
if (j < data._vector.Length && data._vector[j] < data._vector[j + 1]) j++;
if (!(data._vector[k] < data._vector[j])) break;
int tmp = data._vector[k];
data._vector[k] = data._vector[j];
data._vector[j] = tmp;
k = j;
}
}