Implementation of C ++ heap sorting

Source: Internet
Author: User

Print? Void HeapAdjust (int a [], int s, int n) // construct heap
Int j, t;
While (2 * s + 1 <n) // whether the left subtree exists
J = 2 * s + 1;
If (j + 1) <n)
If (a [j] <a [j + 1]) // if the left subtree is smaller than the right subtree, you must compare the right subtree.
J ++; // increase the serial number by 1 to point to the right subtree.
If (a [s] <a [j]) // compare data in which s and j are serial numbers.
T = a [s];
A [s] = a [j];
A [j] = t;
S = j; // after the switch, the heap structure of the subnode of the node is damaged and needs to be adjusted downward.
Else // when the number of children is relatively large, the heap is not damaged and no adjustment is required.
Void HeapSort (int a [], int n) // heap sorting
Int t, I;
Int j;
// Heap creation process
For (I = n/2-1; I> = 0; I --) // build a [0, n-1] into a large root heap, determine whether the heap structure is satisfied from the first non-leaf node During Heap creation, and then adjust it.
HeapAdjust (a, I, n );
// Output the heap top element (exchanged with the end element) of the modified heap, and re-adjusted the entire heap from the root node.
// Repeat n-1 times
For (I = n-1; I> 0; I --)
T = a [0]; // exchange with the I-th record (the record after I has been ordered) to output the record on the heap
A [0] = a [I];
A [I] = t;
HeapAdjust (a, 0, I); // you can change a [0] to a [I] to a heap, only the heap top is damaged, so it is adjusted down from the top of the heap.

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