Implementation method of Java minimum binary tree heap sorting-javaTutorial-php.cn

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java implementation of minimum binary heap Examples of sorting

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Minimum binary heap definition:

A binary heap is a complete binary tree or an approximately complete binary tree. A minimum binary heap is one where the key value of the parent node is always less than or equal to any child. A heap of node key values.

Storage:

Binary heaps are generally represented by arrays.

The position of the root node in the array is 0, and the child nodes at the nth position are at 2n+1 and 2n+2 respectively;

The leaves at position k The position of the parent node is (k-1)/2;

Implementation:

/** * @description 元素添加到末尾，和它的父节点比，如果比它小就交换 * @param array * * @author LynnWong */ private int[] getMinBinaryHeap(int[] array){ int N = array.length; int minBinaryHeap[] = new int[N]; int root;//根的值 int heapSize = 0;//记录插入位置 for(int num : array){ minBinaryHeap[heapSize]=num; ++heapSize; int pointer = heapSize-1;//当前指向的数组元素位置 while(pointer!=0){ int leafPointer = pointer;//叶子节点位置 pointer = (pointer-1)/2;//根节点位置 root = minBinaryHeap[pointer];//根节点 if(num>=minBinaryHeap[pointer]){//永远把当前数组元素看成叶子与其根比较或者换位 break; }//如果根比叶子大 就交换位置 minBinaryHeap[pointer] = num; minBinaryHeap[leafPointer] = root; } } return minBinaryHeap; }

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/*** * 用随机数测试二叉堆排序 * 测试10遍，强迫症似的变态... */ public void text(){ for(int i=0;i<10;i++){ Random rnd = new Random(); int [] lala = {rnd.nextInt(6),rnd.nextInt(6),rnd.nextInt(6),rnd.nextInt(6),rnd.nextInt(6),rnd.nextInt(6)}; System.out.print("输入："); for(int a : lala){ System.out.print(a+" "); } System.out.println(); int []array = this.getMinBinaryHeap(lala); System.out.print("输出："); for(int a : array){ System.out.print(a+" "); } System.out.println(); } }

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