题解 | #字符串加密#

import java.util.*;
import java.util.stream.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        // while (in.hasNextInt()) { // 注意 while 处理多个 case
        //     int a = in.nextInt();
        //     int b = in.nextInt();
        //     System.out.println(a + b);
        // }
        String key = in.nextLine();
        String str = in.nextLine();
        key = key.toLowerCase();
        // char[] ckeys = new char[key.length()];
        // int len = ckeys.length;
        // int ind = 0;
        // char o = 'z' + 1;
        List<Character> list = new ArrayList<>();
        
        for (int i = 0; i < key.length(); i++) {
            boolean exit = false;
            for (int j = 0; j < list.size(); j++) {
                if (list.get(j) == ' ') {
                    break;
                }
                if (key.charAt(i) == list.get(j)) {
                    exit = true;
                    break;
                }
            }
            if (!exit) {
                list.add(key.charAt(i));
            } 
        }
        // key = new String(list.stream().map);
        // if (key.contains(String.valueOf(o))) {
        //     key = key.substring(0, key.indexOf(o));
        // }
        for (char i = 'a'; i <= 'z'; i++) {
            if (!list.contains(i)) {
                list.add(i);
            }
        }
        String newStr = "";
        for (int i = 0; i < str.length(); i++) {
            int index = 0;
            char c = str.charAt(i);
            if (c >= 'A' && c <= 'Z') {
                index = c + 32 -'a';
                newStr += (char)(list.get(index) - 32);
            } else if (c >= 'a' && c <= 'z') {
                index = c - 'a';
                newStr += list.get(index);
            } else {
                newStr += c;
            }
        }
        System.out.print(newStr);
    }
}