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‎docs/README.md‎

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- [第七节 动态规划](LeetCode/算法思想相关/7_动态规划.md)
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- [第八节 数学问题](LeetCode/算法思想相关/8_数学问题.md)
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## 3. 考研机试编程题
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# 💾 数据库
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## 1. DataBase

‎docs/kaoyan/1_基础题目.md‎

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# 基础题目
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## 排序问题
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### [1、常见排序算法](../data_structure/10_排序.md)
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[排序](https://www.nowcoder.com/practice/508f66c6c93d4191ab25151066cb50ef?tpId=69&tqId=29657&tPage=1&ru=/kaoyan/retest/11002&qru=/ta/hust-kaoyan/question-ranking)
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```java
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//思路：这里使用选择排序
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import java.util.Scanner;
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public class Main {
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public static void main(String[] args) {
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Scanner sc=new Scanner(System.in);
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int n=sc.nextInt();
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int[] arr=new int[n];
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for(int i=0;i<n;i++){
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arr[i]=sc.nextInt();
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}
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selectionSort(arr);
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for(int i=0;i<n;i++){
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System.out.print(arr[i]+" ");
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}
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System.out.println();
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}
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//选择排序
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private static void selectionSort(int[] arr){
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int N = arr.length;
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int minIndex = -1;
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for(int i=0;i<N;i++){ // arr[i] 是当前元素
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minIndex=i;
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for(int j=i+1;j<N;j++){ //arr[j] 当前元素后面的元素
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if(arr[j]<arr[minIndex]){
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minIndex=j;
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}
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}
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if(minIndex==i){ //TODO:这里有个小优化：如果当前元素是最小的则不用交换了
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continue;
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}
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swap(arr,minIndex,i);
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}
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}
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private static void swap(int[] arr,int i,int j){
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int tmp = arr[i];
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arr[i] = arr[j];
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arr[j] = tmp;
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}
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}
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```
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### 2、奥运排序问题
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[奥运排序问题](https://www.nowcoder.com/practice/100a4376cafc439b86f5f8791fb461f3?tpId=63&tqId=29564&tPage=1&ru=/kaoyan/retest/9001&qru=/ta/zju-kaoyan/question-ranking)
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```java
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```
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### 3、成绩排序
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[成绩排序](https://www.nowcoder.com/practice/0383714a1bb749499050d2e0610418b1?tpId=60&tqId=29474&tPage=1&ru=/kaoyan/retest/1001&qru=/ta/tsing-kaoyan/question-ranking)
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```java
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```
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## 查找
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### 1、找x
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[找 x](https://www.nowcoder.com/practice/069e2130430c41229ab25e47fa0949a6?tpId=40&tqId=21489&tPage=1&rp=1&ru=/ta/kaoyan&qru=/ta/kaoyan/question-ranking)
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```java
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```
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### 2、查找学生信息
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[查找学生信息](https://www.nowcoder.com/practice/fe8bff0750c8448081759f3ee0d86bb4?tpId=40&tqId=21358&tPage=1&rp=1&ru=/ta/kaoyan&qru=/ta/kaoyan/question-ranking)
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```java
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```
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## 日期处理
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### 1、日期差值
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[日期差值](https://www.nowcoder.com/practice/ccb7383c76fc48d2bbc27a2a6319631c?tpId=62&tqId=29468&tPage=2&ru=/kaoyan/retest/2002&qru=/ta/sju-kaoyan/question-ranking)
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```java
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```
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### 2、Day of Week
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[Day of Week](https://www.nowcoder.com/practice/a3417270d1c0421587a60b93cdacbca0?tpId=40&tqId=21439&tPage=1&rp=1&ru=/ta/kaoyan&qru=/ta/kaoyan/question-ranking)
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```java
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```
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## Hash的使用
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### 1、统计同成绩学生人数
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[统计同成绩学生人数](https://www.nowcoder.com/practice/987123efea5f43709f31ad79a318ca69?tpId=40&tqId=21467&tPage=1&rp=1&ru=/ta/kaoyan&qru=/ta/kaoyan/question-ranking)
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```java
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```
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‎docs/kaoyan/2_字符串处理.md‎

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# 字符串处理
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## 字符与数组
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### 1、统计字符
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[统计字符](https://www.nowcoder.com/practice/4ec4325634634193a7cd6798037697a8?tpId=63&tqId=29574&tPage=1&ru=/kaoyan/retest/9001&qru=/ta/zju-kaoyan/question-ranking)
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```java
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```
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## 字符与整数
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### 1、字符串的反码
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[字符串的反码](https://www.nowcoder.com/practice/01b7dae14d1b464db5f9259e90d9a35e?tpId=65&tqId=29619&tPage=1&ru=/kaoyan/retest/4001&qru=/ta/jlu-kaoyan/question-ranking)
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```java
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```
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## 巧用初始化与巧用存放位置
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### 1、首字母大写
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[首字母大写](https://www.nowcoder.com/practice/91f9c70e7b6f4c0ab23744055632467a?tpId=61&tqId=29529&tPage=2&ru=/kaoyan/retest/1002&qru=/ta/pku-kaoyan/question-ranking)
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```java
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```
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## 字符串内部操作
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### 1、回文字符串
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[回文字符串](https://www.nowcoder.com/practice/df00c27320b24278b9c25f6bb1e2f3b8?tpId=69&tqId=29674&tPage=2&ru=/kaoyan/retest/11002&qru=/ta/hust-kaoyan/question-ranking)
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```java
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```
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## 字符串处理函数的应用
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### 1、最长&最短文本
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[最长&最短文本](https://www.nowcoder.com/practice/3331d16fe07d4358858178ff5fa73e0d?tpId=69&tqId=31041&tPage=2&ru=/kaoyan/retest/11002&qru=/ta/hust-kaoyan/question-ranking)
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```java
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```
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## 数值转换
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### 1、字符串的查找删除
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[字符串的查找删除](https://www.nowcoder.com/practice/a591300637874f6ba2316a5fe3e94579?tpId=66&tqId=29631&tPage=1&ru=/kaoyan/retest/1004&qru=/ta/buaa-kaoyan/question-ranking)
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```java
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```

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