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344 changed files with 2463 additions and 4826 deletions

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@ -14,6 +14,7 @@
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>17</maven.compiler.source>
@ -23,12 +24,6 @@
<dependencies>
<!--jdbc Driver-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.33</version>
</dependency>
<!-- Lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
@ -38,6 +33,7 @@
</dependency>
<!-- JPA API -->
<dependency>
<groupId>javax.persistence</groupId>

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@ -54,6 +54,5 @@ public class FactoryAndStrategy {
}
}
}

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@ -2,11 +2,6 @@ package cn.whaifree.designPattern.kama.CreateType.AbstractFactoryPattern;
public class AbstractFactoryPattern {
/**
* AbstractFactory--> ModernFactory --|
* --> ClassicFactory --|-->Sofa OR Chair
* @param args
*/
// https://kamacoder.com/problempage.php?pid=1077
public static void main(String[] args) {

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@ -1,57 +0,0 @@
### 简单工厂
一个工厂生产多种产品
```java
public static Product createProduct(String type) {
if ("A".equalsIgnoreCase(type)) {
return new ProductA();
} else if ("B".equalsIgnoreCase(type)) {
return new ProductB();
}
throw new IllegalArgumentException("Unknown product type");
}
```
### 工厂方法
对工厂抽象
```java
// 抽象工厂接口
interface Factory {
Product createProduct();
}
// 具体工厂A
class FactoryA implements Factory {
@Override
public Product createProduct() {
return new ProductA();
}
}
public static void main(String[] args) {
Factory factory = new FactoryA();
Product product = factory.createProduct();
product.use(); // 输出: Using Product A
}
```
### 抽象工厂
对产品再次抽象出不同属性
```java
// 产品族A接口
interface AbstractProductA {
void featureA();
}
// 具体产品A1
class ProductA1 implements AbstractProductA {
@Override
public void featureA() {
System.out.println("Feature A1");
}
}
```

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@ -1,79 +0,0 @@
package cn.whaifree.interview.PA;
import java.util.Scanner;
/**
* @version 1.0
* @Author whai文海
* @Date 2024/10/30 17:38
* @注释
*/
public class P1 {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
// 注意 hasNext hasNextLine 的区别
while (in.hasNextInt()) { // 注意 while 处理多个 case
int n = in.nextInt();
int m = in.nextInt();
/**
* 0 1 2
* 0 0 0 0
* 1 1 1 1
* 2 1 2 3
* 3 1 3 6
*/
int[] dp = new int[m + 1];
dp[0] = 1;
for (int i = 0; i < n; i++) {
for (int j = 1; j <= m; j++) {
dp[j] = dp[j] + dp[j - 1];
}
}
System.out.println(dp[m]);
}
}
}
class p2{
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String str = scanner.next();
int res = 0;
for (int right = 0; right <= str.length(); right++) {
for (int left = 0; left < right; left++) {
String leftStr = str.substring(0, left);
String rightStr = str.substring(right, str.length());
String concat = leftStr + rightStr;
if (!concat.isEmpty() && huiwen(concat)) {
System.out.println(concat);
res++;
}
}
}
System.out.println(res);
}
public static boolean huiwen(String str){
int left = 0;
int right = str.length() - 1;
while (left < right) {
if (str.charAt(left) != str.charAt(right)) {
return false;
}
left++;
right--;
}
return true;
}
}

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@ -1,59 +0,0 @@
package cn.whaifree.interview.jr;
import java.util.Scanner;
/**
* @version 1.0
* @Author whai文海
* @Date 2024/10/22 12:11
* @注释
*/
public class p1 {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int people = in.nextInt();
int gzNum = in.nextInt();
int[] nums = new int[people];
for (int i = 0; i < people; i++) {
nums[i] = in.nextInt();
}
int[] gzNums = new int[gzNum];
for (int i = 0; i < nums.length; i++) {
int want = nums[i];
gzNums[want - 1]++;
}
int res = 0;
for (int num : gzNums) {
int needSum = num / 2;
if (num % 2 == 1) {
res += (needSum + 1);
} else {
res += (needSum);
}
}
System.out.println(res);
}
}
class p2{
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
// 注意 hasNext hasNextLine 的区别
int v0 = in.nextInt(); // 初始速度
int x = in.nextInt(); // v=v0+t*x
int y = in.nextInt(); // 总里程
// t1 = y / v = y / (v0+t*x)
// t = 2 / (t) t
// 速度t 2 2/t=2.8284271 t = 2/更好8 = 根号2/2
double t = Math.sqrt(2) / 2;
System.out.println(y / (v0 + t * x));
}
}

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@ -34,7 +34,7 @@ import java.util.Arrays;
*
* 如果你已经实现 O(n) 时间复杂度的解法, 请尝试设计一个 O(n log(n)) 时间复杂度的解法
*/
public class LeetCode209_2 {
public class LeetCode209 {
/**
* 暴力求解会超时

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@ -13,7 +13,7 @@ public class LeetCode115 {
public void test()
{
Solution solution = new Solution();
System.out.println(solution.numDistinct("babgbag", "bag"));
System.out.println(solution.numDistinct("rabbbit", "rabbit"));
}
class Solution {

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@ -9,7 +9,7 @@ import org.junit.Test;
* @注释
*/
public class LeetCode718_2 {
public class LeetCode718 {
@Test
public void test()
{

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