private void Heapify(int[] arr, int idx, int heapSize)
{
if (idx >= heapSize / 2)
{
return;
}
var left = Left(idx);
var right = Right(idx);
var largest = idx;
if (left < heapSize && arr[left] > arr[idx])
{
largest = left;
}
if (right < heapSize && arr[right] > arr[largest])
{
largest = right;
}
if (largest != idx)
{
BotterUtils.Swap(ref arr[largest], ref arr[idx]);
Heapify(arr, largest, heapSize);
}
}
public void Sort(int[] arr)
{
int k = 0;
int left = 0;
int right = arr.Length - 1;
while (left < right)
{
for (int i = right; i > left; i--)
{
if (arr[i] < arr[i - 1])
{
BotterUtils.Swap(ref arr[i], ref arr[i - 1]);
k = i;
}
}
left = k;
for (int i = left; i < right; i++)
{
if (arr[i] > arr[i + 1])
{
BotterUtils.Swap(ref arr[i], ref arr[i + 1]);
k = i;
}
}
right = k;
}
}
public void Sort(int[] arr)
{
for (int i = 0; i < arr.Length - 1; i++)
{
for (int j = arr.Length - 1; j > i; j--)
{
if (arr[j] < arr[j - 1])
{
BotterUtils.Swap(ref arr[j], ref arr[j - 1]);
}
}
}
}
public void Sort(int[] arr)
{
for (int i = 0; i < arr.Length - 1; i++)
{
for (int j = i + 1; j < arr.Length; j++)
{
if (arr[j] < arr[i])
{
BotterUtils.Swap(ref arr[j], ref arr[i]);
}
}
}
}
public void Sort(int[] arr)
{
// build heap
for (int i = arr.Length / 2 - 1; i >= 0; i--)
{
Heapify(arr, i, arr.Length);
}
// sort
var heapSize = arr.Length;
for (int i = arr.Length - 1; i > 0; i--)
{
BotterUtils.Swap(ref arr[i], ref arr[0]);
heapSize--;
Heapify(arr, 0, heapSize);
}
}
public void Sort(int[] arr)
{
for (int i = 0; i < arr.Length; i++)
{
// find index of minimum element in unordered list
var minIdx = i;
for (int j = i + 1; j < arr.Length; j++)
{
if (arr[j] < arr[minIdx])
{
minIdx = j;
}
}
// put minimum element to ordered list
if (minIdx != i)
{
BotterUtils.Swap(ref arr[minIdx], ref arr[i]);
}
}
}
private int Partition(int[] m, int leftIdx, int rightIdx)
{
// get pivot as the right most element of the array
var pivot = m[rightIdx];
var i = leftIdx;
for (var j = leftIdx; j < rightIdx; j++)
{
if (m[j] <= pivot)
{
BotterUtils.Swap(ref m[i], ref m[j]);
i++;
}
}
var tm = m[rightIdx];
m[rightIdx] = m[i];
m[i] = tm;
return(i);
}
