1、学习蓝桥云课省赛冲刺课 【1-手写与思维】【2-递归与递推】

2、学习蓝桥云课Java省赛无忧班 【1-语言基础】

3、代码练习

字符串排序

package THL_0406;import java.util.Arrays;public class ArrangeLetters {public static void main(String[] args) {String string = "WHERETHEREISAWILLTHEREISAWAY";char[] ch = string.toCharArray();Arrays.sort(ch);System.out.println(ch);}
}

大小写转换 （ccfcsp之前要是学了我就能上200了 啊啊啊啊 错过啊）

package THL_0406;import java.util.Scanner;public class CaseConversion {public static void main(String[] args) {Scanner sc = new Scanner(System.in);String string = sc.next();// 异或char[] ch = string.toCharArray();for(int i=0;i<ch.length;i++) {ch[i] = (char) (ch[i] ^ 32); // 将大写字母转成小写字母，将小写字母转成大写字母}System.out.print("大小写互换为："+" ");System.out.println(ch);System.out.println("全部转换成小写字母:"+string.toLowerCase()+"全部转换成大写字母:"+string.toUpperCase());}
}

斐波那契数列 递归解法

package THL_0406;import java.util.Scanner;public class Fibonacci {public static void main(String[] args) {Scanner sc = new Scanner(System.in);int num = sc.nextInt();System.out.println(Fibonacci(num));}public static int Fibonacci(int n) {if(n==1||n==2) {return 1;}else {return Fibonacci(n-1) + Fibonacci(n-2);}}
}

纸张尺寸问题

package THL_0406;import java.util.Scanner;public class Fibonacci {public static void main(String[] args) {Scanner sc = new Scanner(System.in);int num = sc.nextInt();System.out.println(Fibonacci(num));}public static int Fibonacci(int n) {if(n==1||n==2) {return 1;}else {return Fibonacci(n-1) + Fibonacci(n-2);}}
}