插入排序

插入排序

import java.util.Arrays;

public class Code_01_InsertionSort {
    public static void insertionSort(int []arr){
        if(arr==null||arr.length<1){
            return;
        }
        for(int i=1;i<arr.length;i++){
            for(int j=i-1;j>=0&&arr[j]>arr[j+1];j--){
                swap(arr,j,j+1);
            }
        }
    }

    private static void swap(int[] arr, int j, int i) {
        arr[i] = arr[i] ^ arr[j];
        arr[j] = arr[i] ^ arr[j];
        arr[i] = arr[i] ^ arr[j];
    }

    //for test
    public static void comparator(int []arr){
        Arrays.sort(arr);
    }
    //for test
    public static int []generateRandomArray(int maxSize,int maxValue){
        int []arr=new int[(int)((maxSize+1)*Math.random())];
        for(int i=0;i<arr.length;i++){
            arr[i]=(int)((maxSize+1)*Math.random())-(int)((maxSize)*Math.random());

        }
        return arr;
    }
    //for test
    public static int[]copyArray(int []arr){
        if(arr==null)
            return null;
        int []res=new int[arr.length];
        for(int i=0;i<arr.length;i++){
            res[i]=arr[i];
        }
        return res;
    }
    //for test
    public static boolean isEqual(int []arr1,int[]arr2){
        if((arr1==null&&arr2!=null)||(arr1!=null&&arr2==null)){
            return false;
        }
        if(arr1==null&&arr2==null)
            return true;
        if(arr1.length!=arr2.length)
            return false;
        for (int i=0;i<arr1.length;i++){
            if(arr1[i]!=arr2[i]){
                return false;
            }

        }
        return true;
    }
    //for test
    public static void printArray(int []arr){
        if(arr==null){
            return;
        }
        for(int i=0;i<arr.length;i++){
            System.out.print(arr[i]+" ");
        }
        System.out.println();
    }

    public static void main(String[] args) {
        int testTime=500000;
        int maxSize=100;
        int maxValue=100;
        boolean succeed=true;
        for(int i=0;i<testTime;i++){
            int []arr1=generateRandomArray(maxSize,maxValue);
            int []arr2=copyArray(arr1);
            insertionSort(arr1);
            comparator(arr2);
            if(!isEqual(arr1,arr2)){
                succeed=false;
                break;
            }
        }
        System.out.println(succeed?"Nice !":"Fucing fucked!");

        int []arr=generateRandomArray(maxSize,maxValue);
        printArray(arr);
        insertionSort(arr);
        printArray(arr);
    }


}

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