当前位置：网站首页>today‘s task
today‘s task
2022-08-02 21:50:00 【漫漫行程路】
1
package class01;
import java.util.Arrays;
public class Code01_SelectionSort {
public static void selectionSort(int[] arr) {
if (arr == null || arr.length < 2) {
return;
}
for (int i = 0; i < arr.length - 1; i++) {
int minIndex = i;
for (int j = i + 1; j < arr.length; j++) {
minIndex = arr[j] < arr[minIndex] ? j : minIndex;
}
swap(arr, i, minIndex);
}
}
public static void swap(int[] arr, int i, int j) {
int tmp = arr[i];
arr[i] = arr[j];
arr[j] = tmp;
}
// 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) ((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;
int maxValue = 100;
boolean succeed = true;
for (int i = 0; i < testTime; i++) {
int[] arr1 = generateRandomArray(maxSize, maxValue);
int[] arr2 = copyArray(arr1);
selectionSort(arr1);
comparator(arr2);
if (!isEqual(arr1, arr2)) {
succeed = false;
printArray(arr1);
printArray(arr2);
break;
}
}
System.out.println(succeed ? "Nice!" : "Fucking fucked!");
int[] arr = generateRandomArray(maxSize, maxValue);
printArray(arr);
selectionSort(arr);
printArray(arr);
}
}
2
package class01;
import java.util.Arrays;
public class Code02_BubbleSort {
public static void bubbleSort(int[] arr) {
if (arr == null || arr.length < 2) {
return;
}
for (int e = arr.length - 1; e > 0; e--) {
for (int i = 0; i < e; i++) {
if (arr[i] > arr[i + 1]) {
swap(arr, i, i + 1);
}
}
}
}
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) {
int[] arr = new int[(int) ((maxSize + 1) * Math.random())];
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;
int maxValue = 100;
boolean succeed = true;
for (int i = 0; i < testTime; i++) {
int[] arr1 = generateRandomArray(maxSize, maxValue);
int[] arr2 = copyArray(arr1);
bubbleSort(arr1);
comparator(arr2);
if (!isEqual(arr1, arr2)) {
succeed = false;
break;
}
}
System.out.println(succeed ? "Nice!" : "Fucking fucked!");
int[] arr = generateRandomArray(maxSize, maxValue);
printArray(arr);
bubbleSort(arr);
printArray(arr);
}
}
3
package class01;
import java.util.Arrays;
public class Code03_InsertionSort {
public static void insertionSort(int[] arr) {
if (arr == null || arr.length < 2) {
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);
}
}
}
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) {
int[] arr = new int[(int) ((maxSize + 1) * Math.random())];
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;
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!" : "Fucking fucked!");
int[] arr = generateRandomArray(maxSize, maxValue);
printArray(arr);
insertionSort(arr);
printArray(arr);
}
}
4
package class01;
public class Code04_BSExist {
public static boolean exist(int[] sortedArr, int num) {
if (sortedArr == null || sortedArr.length == 0) {
return false;
}
int L = 0;
int R = sortedArr.length - 1;
int mid = 0;
while (L < R) {
mid = L + ((R - L) >> 1);
if (sortedArr[mid] == num) {
return true;
} else if (sortedArr[mid] > num) {
R = mid - 1;
} else {
L = mid + 1;
}
}
return sortedArr[L] == num;
}
}
5
package class01;
public class Code05_BSNearLeft {
// 在arr上，找满足>=value的最左位置
public static int nearestIndex(int[] arr, int value) {
int L = 0;
int R = arr.length - 1;
int index = -1;
while (L < R) {
int mid = L + ((R - L) >> 1);
if (arr[mid] >= value) {
index = mid;
R = mid - 1;
} else {
L = mid + 1;
}
}
return index;
}
}
6
package class01;
public class Code06_BSAwesome {
public static void main(String[] args) {
// TODO Auto-generated method stub
}
}
7
package class01;
public class Code07_EvenTimesOddTimes {
public static void printOddTimesNum1(int[] arr) {
int eO = 0;
for (int cur : arr) {
eO ^= cur;
}
System.out.println(eO);
}
public static void printOddTimesNum2(int[] arr) {
int eO = 0, eOhasOne = 0;
for (int curNum : arr) {
eO ^= curNum;
}
int rightOne = eO & (~eO + 1);
for (int cur : arr) {
if ((cur & rightOne) != 0) {
eOhasOne ^= cur;
}
}
System.out.println(eOhasOne + " " + (eO ^ eOhasOne));
}
public static void main(String[] args) {
int a = 5;
int b = 7;
a = a ^ b;
b = a ^ b;
a = a ^ b;
System.out.println(a);
System.out.println(b);
int[] arr1 = { 3, 3, 2, 3, 1, 1, 1, 3, 1, 1, 1 };
printOddTimesNum1(arr1);
int[] arr2 = { 4, 3, 4, 2, 2, 2, 4, 1, 1, 1, 3, 3, 1, 1, 1, 4, 2, 2 };
printOddTimesNum2(arr2);
}
}
8
package class01;
public class Code08_GetMax {
public static int getMax(int[] arr) {
return process(arr, 0, arr.length - 1);
}
public static int process(int[] arr, int L, int R) {
if (L == R) {
return arr[L];
}
int mid = L + ((R - L) >> 1);
int leftMax = process(arr, L, mid);
int rightMax = process(arr, mid + 1, R);
return Math.max(leftMax, rightMax);
}
}
9
package class01;
public class Code09_FindOneLessValueIndex {
public static int getLessIndex(int[] arr) {
if (arr == null || arr.length == 0) {
return -1; // no exist
}
if (arr.length == 1 || arr[0] < arr[1]) {
return 0;
}
if (arr[arr.length - 1] < arr[arr.length - 2]) {
return arr.length - 1;
}
int left = 1;
int right = arr.length - 2;
int mid = 0;
while (left < right) {
mid = (left + right) / 2;
if (arr[mid] > arr[mid - 1]) {
right = mid - 1;
} else if (arr[mid] > arr[mid + 1]) {
left = mid + 1;
} else {
return mid;
}
}
return left;
}
public static void printArray(int[] arr) {
for (int i = 0; i != arr.length; i++) {
System.out.print(arr[i] + " ");
}
System.out.println();
}
public static void main(String[] args) {
int[] arr = { 6, 5, 3, 4, 6, 7, 8 };
printArray(arr);
int index = getLessIndex(arr);
System.out.println("index: " + index + ", value: " + arr[index]);
}
}
边栏推荐
- 【学习笔记】博弈论
- The only way to go from a monthly salary of 10k to 30k: automated testing
- GameStop NFT 市场分析
- group of people
- 【c】操作符详解（一）
- 【使用pyside2遇到的问题】This application failed to start because no Qt platform plugin could be initialized.
- Ruoyi integrates minio to realize distributed file storage
- MDL 内存描述符链表
- H5网页播放器EasyPlayer.js播放器界面的加载效果无法消失是什么原因？
- js函数防抖和函数节流及其他使用场景
猜你喜欢
最近火爆朋友圈的“广告电商”，核心商业模式是什么，广告收入真实靠谱吗？
圆锥折射作为偏振计量工具的模拟
第十章 时序与延迟
面试了个985毕业的，回答“性能调优”题时表情令我毕生难忘
LeetCode 2359. 找到离给定两个节点最近的节点 基环树
抽象工厂模式
What is the core business model of the "advertising e-commerce" that has recently become popular in the circle of friends, and is the advertising revenue really reliable?
Redis是如何轻松实现系统秒杀的？
在迁移测试中，源表、中间表、目标表的迁移规则
了解 NFT 质押：Web3 中赚取被动收益的另一种方式
随机推荐
不堪哥哥殴打谩骂，妹妹申请人身安全保护令获支持
创建型模式 - 单例模式Singleton
The only way to go from a monthly salary of 10k to 30k: automated testing
win10安全中心设置不扫描某个文件夹的方法
如何抓住NFT、元|宇|宙新趋势？
You and I will meet the needs of: how to export the data in a MySQL simple ~!Practical!
【学习笔记】博弈论
JS 包装类 Math对象 round max() min() random
SSM integration steps (emphasis)
牛客刷题：手动实现数组filter方法
若依如何实现添加水印功能
kubernetes pod podsecurityPolicies（PSP）
LeetCode 2360. 图中的最长环 基环树找环+时间戳
How to seize the new trend of NFT, yuan|universe|universe?
Auto.js实现朋友圈自动点赞
Matplotlib drawing core principles explain (more detailed)
I interviewed a 985 graduate, and I will never forget the expression when answering the "performance tuning" question
Web APIs BOM- 操作浏览器-Window对象
用于中文文本分类的中文停用词
工厂模式理解了没有？