医院信息管理系统（SpringBoot + SSM）.zip

package com.example.his.test; import java.util.Random; public class sort { public static void main(String[] args) { SortTest sortTest = new SortTest(100000,100,5000000); // sortTest.insertSort(); // sortTest.insertSort2(); // sortTest.selectSort(); // sortTest.maopaoSort(); sortTest.guibingSort(); int[] arr = sortTest.randArr(100000,100,5000000); long preTiem = System.currentTimeMillis(); quickSort(arr,0,99999); long nextTime = System.currentTimeMillis(); System.out.println("快速排序总用时" + (nextTime-preTiem) + " ms"); for (int i=0; i<100; i++) System.out.print(arr[i] + " "); System.out.println(); } public static void quickSort(int[] arr,int start,int end) { if(start >= end) { return; } int i,j,t,temp; i = start; j = end; // Random r = new Random(); // int q = r.nextInt(end-start) + start; temp = arr[i]; while (i<j){ while (i<j && temp <= arr[j]) j--; while (i<j && temp >= arr[i]) i++; if (i<j){ t = arr[i]; arr[i] = arr[j]; arr[j] = t; } } arr[start] = arr[i]; arr[i] = temp; quickSort(arr,start,j-1); quickSort(arr,j+1,end); } } class SortTest{ private int n; private int l; private int r; private int[] a; public SortTest(int n,int l, int r) { this.n = n; a = randArr(n,l,r); } public void quickSort(){ int[] arr = a.clone(); long preTime = System.currentTimeMillis(); quick(arr,0,n-1); long nextTime = System.currentTimeMillis(); System.out.println("归并排序总用时" + (nextTime - preTime) + "ms"); for (int i=0; i<Math.min(n,100); i++) System.out.print(arr[i] + " "); System.out.println(); } private void quick(int[] arr,int low,int high){ } /** * 归并排序 */ public void guibingSort(){ int[] arr = a.clone(); long preTime = System.currentTimeMillis(); guibing1(arr,0,n-1); long nextTime = System.currentTimeMillis(); System.out.println("归并排序总用时" + (nextTime - preTime) + "ms"); for (int i=0; i<Math.min(n,100); i++) System.out.print(arr[i] + " "); System.out.println(); } private void guibing1(int[] aa, int m, int q){ if (m >= q) return; //优化???小于15用插入排序？？？ // if (q - m < 15){ // for (int i=1; i<n; i++){ // int c = aa[i]; // int j; // for (j=i; j>0 && aa[j-1] > c; j--){ // aa[j] = aa[j-1]; // } // aa[j] = c; // } // return; // } int mid = (m+q)/2; guibing1(aa,m,mid); guibing1(aa,mid+1,q); //优化1，有序就不排，当数组比较有序时速度加快，反之变慢 // if (aa[mid] > aa[mid+1]) merge(aa,m,mid,q); } private void merge(int[] aa, int m, int mid, int q){ int[] aux = new int[q-m+1]; int i=m,j=mid+1,k=0; //将较小的元素先存入新数组 while (i<=mid && j<=q ){ if (aa[i] < aa[j]) aux[k++] = aa[i++]; else aux[k++] = aa[j++]; } //将左数组存入新数组 while (i<=mid){ aux[k++] = aa[i++]; } //将右数组存入新数组 while (j<=q){ aux[k++] = aa[j++]; } for (int l=0; l<aux.length; l++){ aa[l+m] = aux[l]; } } /** * 插入排序 */ public void insertSort(){ int[] arr = a.clone(); int k; long preTime = System.currentTimeMillis(); for (int i=1; i<n; i++){ for (int j=i; j>0; j--){ if (arr[j] < arr[j-1]){ k = arr[j-1]; arr[j-1] = arr[j]; arr[j] = k; }else { break; } } } long nextTime = System.currentTimeMillis(); System.out.println("插入排序总用时" + (nextTime - preTime) + "ms"); for (int i=0; i<Math.min(n,100); i++) System.out.print(arr[i] + " "); System.out.println(); } /** * 插入排序优化 */ public void insertSort2(){ int[] arr = a.clone(); long preTime = System.currentTimeMillis(); for (int i=1; i<n; i++){ int c = arr[i]; int j; for (j=i; j>0 && arr[j-1] > c; j--){ arr[j] = arr[j-1]; } arr[j] = c; } long nextTime = System.currentTimeMillis(); System.out.println("优化后的插入排序总用时" + (nextTime - preTime) + "ms"); for (int i=0; i<Math.min(n,100); i++) System.out.print(arr[i] + " "); System.out.println(); } /** * 选择排序 */ public void selectSort(){ int[] arr = a.clone(); long preTime = System.currentTimeMillis(); for (int i=0; i<n; i++){ int k=i,m; for (int j=i+1; j<n; j++){ if (arr[j] < arr[k]) k = j; } m = arr[i]; arr[i] = arr[k]; arr[k] = m; } long nextTime = System.currentTimeMillis(); System.out.println("选择排序总用时" + (nextTime - preTime) + "ms"); for (int i=0; i<Math.min(n,100); i++) System.out.print(arr[i] + " "); System.out.println(); } /** * 冒泡排序 */ public void maopaoSort(){ int[] arr = a.clone(); int m; long preTime = System.currentTimeMillis(); for (int i=1; i<n; i++){ for (int j=0; j<n-i; j++){ if (arr[j] > arr[j+1]){ m = arr[j+1]; arr[j+1] = arr[j]; arr[j] = m; } } } long nextTime = System.currentTimeMillis(); System.out.println("冒泡排序总用时" + (nextTime - preTime) + "ms"); for (int i=0; i<Math.min(n,100); i++) System.out.print(arr[i] + " "); System.out.println(); } /** * 随机生成数组 * @param n 数组大小 * @param l 最小值 * @param r 最大值 * @return 数组 */ protected int[] randArr(int n, int l, int r){ int[] arr = new int[n]; Random random = new Random(); for (int i=0; i<n; i++) arr[i] = random.nextInt(r-l) + l ; return arr; } /** * 生成近乎有序的数组 * @param n 数组大小 * @param l 最小值 * @param r 最大值 * @return 数组 */ protected int[] randApprSortArr(int n, int l, int r){ int[] arr = new int[n]; Random random = new Random(); for (int i=0; i<n; i++) arr[i] = i+l ; for (int i=0; i<Math.min(n,100); i++){ int k = random.nextInt(n); int m = random.nextInt(n); int q = arr[k]; arr[k] = arr[m]; arr[m] = q; } return arr; } }