#include<stdio.h>


void FindMaxInHeap(int arr[], const int size) {   
    for (int j = size - 1; j > 0; --j) {   
        int parent = j / 2;   
        int child = j;   
        if (j < size - 1 && arr[j] < arr[j+1]) {   
            ++child;   
        }   
        if (arr[child] > arr[parent]) {   
            int tmp = arr[child];   
            arr[child] = arr[parent];   
            arr[parent] = tmp;   
        }   
    }   
}   
void HeapSort(int arr[], const int size) {   
    for (int j = size; j > 0; --j) {   
        FindMaxInHeap(arr, j);   
        int tmp = arr[0];   
        arr[0] = arr[j - 1];   
        arr[j - 1] = tmp;   
    }   
}   

int main()
{
    int arr[] = {2, 5, 3, 12, 6, 21, 8, 1};   
    int n = sizeof(arr) / sizeof(arr[0]);   
    HeapSort(arr, n);   
    for (int j = 0; j < n; ++j) {   
       printf("%3d",arr[j]);   
    }   
    printf("\n");   
return 0;
}

堆排序--C语言实现,布布扣,bubuko.com

堆排序--C语言实现