题解 | #字符串加密#

import java.util.Scanner;

// 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);
        String line = in.nextLine();
        String code = in.nextLine();
        
        char[] set = new char[100];
        char[] dictionary = new char[26];
        int j = 0;
        for (int i = 0; i < line.length(); ++i) {
            char letter = line.charAt(i);
            int search = letter - 'a';
            if (set[search] == 0) {
                set[search] = letter;
                dictionary[j++] = letter;
            }
        }
        for (int i = 0; i < dictionary.length; ++i) {
            if (set[i] == 0) {
                dictionary[j++] = (char) ('a' + i);
            }
        }
        
        for (int i = 0; i < code.length(); ++i) {
            char letter = code.charAt(i);
            if (!Character.isWhitespace(letter)) {
                set[i] = dictionary[letter - 'a'];
            } else {
                set[i] = letter;
            }
        }

        String password = new String(set, 0, code.length());
        System.out.println(password);
    }
}