闲的无聊又拿起了大学的数据结构的书看起来 《数据结构(c语言版)》严蔚敏 吴伟民编著。
里面有几个排序算法,感觉挺好玩的,就想着写出来玩玩。
package test.sort; /** * @Title: TODO * @Description: TODO * @author: * @date: 2014-8-10 上午11:20:43 * */ public class quickSort { private static int datas[] = {23,42,12,45,56,63,24,41,32}; /** * @Title: main * @Description: TODO * @param @param args * @return void 返回类型 * @author * @time 2014-8-10 上午11:20:43 * @throws */ public static void main(String[] args) { // bubbleSort(); // quickSort(datas, 0, datas.length-1); // selectSort(datas); heapSort(datas); for(int data : datas) { System.out.print(data + " "); } } //冒泡排序 public static void bubbleSort() { for(int i = 0; i < datas.length-1; i++) { for(int j = i+1; j < datas.length; j++) { int num = 0; if(datas[i] > datas[j]) { num = datas[i]; datas[i] = datas[j]; datas[j] = num; } } } } public static int partition(int datas[] , int low , int high) { int pivotkey = datas[low]; while (low < high ) { while(low < high && datas[high] >= pivotkey) high--; datas[low] = datas[high]; while (low < high && datas[low] <= pivotkey) { low++; } datas[high] = datas[low]; } datas[low] = pivotkey; return low; } //快速排序算法 public static void quickSort(int datas[] , int low , int high) { if(low < high) { int pivotloc = partition(datas, low, high); quickSort(datas, low, pivotloc-1); quickSort(datas, pivotloc+1, high); } } //选择排序 public static void selectSort(int datas[]) { for(int i = 0; i < datas.length -1; i++) { int j = selectMinKey(datas,i); if(i != j) { int num = datas[i]; datas[i] = datas[j]; datas[j] = num; } } } //找出数组中最小的值所在的位置 public static int selectMinKey(int datas[],int i) { int minIndex = i; int minData = datas[i]; for (int j = i+1; j < datas.length; j++) { if (minData > datas[j]) { minIndex = j; minData = datas[j]; } } return minIndex; } //从第s个元素为根节点组成一个堆,也就是筛选 public static void heapAdjust(int datas[] ,int s, int m) { int rc = datas[s]; for (int i = 2*s+1; i < m; i*=2) { if(i < m-1 && datas[i] < datas[i+1]) i++; if (rc >= datas[i]) { break; } datas[s] = datas[i]; s = i; } datas[s] = rc; } //堆排序 public static void heapSort(int datas[]) { for(int i = datas.length/2-1; i >= 0 ; i--) heapAdjust(datas, i, datas.length); for(int j = datas.length - 1; j > 0; j--) { int num = datas[0]; datas[0] = datas[j]; datas[j] = num; heapAdjust(datas, 0, j); } } }
数据结构排序算法Java实现
时间: 2024-10-27 05:24:42