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In_java.java #156

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59 changes: 59 additions & 0 deletions In_java.java
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Original file line number Diff line number Diff line change
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// HeapSort
public class HeapSort
{
public void sort(int arr[])
{
int n = arr.length;
for (int i = n / 2 - 1; i >= 0; i--)
heapify(arr, n, i);
for (int i=n-1; i>=0; i--)
{
int temp = arr[0];
arr[0] = arr[i];
arr[i] = temp;
heapify(arr, i, 0);
}
}
void heapify(int arr[], int n, int i)
{
int largest = i;
int l = 2*i + 1;
int r = 2*i + 2;
if (l < n && arr[l] > arr[largest])
largest = l;
if (r < n && arr[r] > arr[largest])
largest = r;
if (largest != i)
{
int swap = arr[i];
arr[i] = arr[largest];
arr[largest] = swap;
heapify(arr, n, largest);
}
}
static void printArray(int arr[])
{
int n = arr.length;
for (int i=0; i<n; ++i)
System.out.print(arr[i]+" ");
System.out.println();
}
public static void main(String args[])
{
int arr[] = {12, 11, 13, 5, 6, 7};
int n = arr.length;

HeapSort ob = new HeapSort();
ob.sort(arr);

System.out.println("Sorted array is");
printArray(arr);
}
}

// Time complexity: Best case:O(nlog n)
// average case:O(nlog n)
// worst case:O(nlog n)


// code by Rufus paul