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package class01;
import java.util.Arrays;
public class Code03_InsertionSort {
public static void insertionSort(int[] arr) {
if (arr == null || arr.length < 2) {
return;
}
// 不只1个数
for (int i = 1; i < arr.length; i++) { // 0 ~ i 做到有序
for (int j = i - 1; j >= 0 && arr[j] > arr[j + 1]; j--) {
swap(arr, j, j + 1);
}
}
}
// i和j是一个位置的话会出错
public static void swap(int[] arr, int i, int j) {
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) {
// Math.random() -> [0,1) 所有的小数,等概率返回一个
// Math.random() * N -> [0,N) 所有小数,等概率返回一个
// (int)(Math.random() * N) -> [0,N-1] 所有的整数,等概率返回一个
int[] arr = new int[(int) ((maxSize + 1) * Math.random())]; // 长度随机
for (int i = 0; i < arr.length; i++) {
arr[i] = (int) ((maxValue + 1) * Math.random()) - (int) (maxValue * 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();
}
// for test
public static void main(String[] args) {
int testTime = 500000;
int maxSize = 100; // 随机数组的长度0100
int maxValue = 100;// 值:-100100
boolean succeed = true;
for (int i = 0; i < testTime; i++) {
int[] arr = generateRandomArray(maxSize, maxValue);
int[] arr1 = copyArray(arr);
int[] arr2 = copyArray(arr);
insertionSort(arr1);
comparator(arr2);
if (!isEqual(arr1, arr2)) {
// 打印arr1
// 打印arr2
succeed = false;
for (int j = 0; j < arr.length; j++) {
System.out.print(arr[j] + " ");
}
System.out.println();
break;
}
}
System.out.println(succeed ? "Nice!" : "Fucking fucked!");
int[] arr = generateRandomArray(maxSize, maxValue);
printArray(arr);
insertionSort(arr);
printArray(arr);
}
}