堆排序

public class Main {
	public static void main(String[] args) {
		int[] arr = {0, 2, 1, 5, 8, 2, 4, 3, 7, 6, 5};
		heapSort(arr, arr.length - 1);
		for(int i = 1; i < arr.length; i++) {
			System.out.print(arr[i] + " ");
		}
	}
	public static void heapSort(int[] arr, int size) {
		initHeap(arr, size);
		for(int i = size; i >= 1; i--) {
			int temp = arr[1];
			arr[1] = arr[i];
			arr[i] = temp;
			adjustHeap(arr, i - 1, 1);
			
		}
	}
	public static void initHeap(int[] arr, int size) {
		int i;
		for(i = size / 2; i >= 1; i--) {
			adjustHeap(arr, size, i);
		}
	}
	public static void adjustHeap(int[] arr, int size, int i) {
		int lchild = 2 * i;
		int rchild = 2 * i + 1;
		int max = i;
		if(i <= size / 2) {
			if(lchild <= size && arr[lchild] > arr[max]) {
				max = lchild;
			}
			if(rchild <= size && arr[rchild] > arr[max]) {
				max = rchild;
			}
			if(max != i) {
				int temp = arr[i];
				arr[i] = arr[max];
				arr[max] = temp;
				adjustHeap(arr, size, max);
			}
		}
	}
	
	
	
	
}