题解 | #字符串加解密#

def encrypt(s):
    result = []
    for c in s:
        if c.isalpha():
            # 处理字母
            is_upper = c.isupper()
            # 获取下一个字母，注意z/Z的特殊情况
            next_char = chr((ord(c.lower()) - ord('a') + 1) % 26 + ord('a'))
            # 改变大小写
            result.append(next_char.upper() if not is_upper else next_char.lower())
        elif c.isdigit():
            # 处理数字
            result.append(str((int(c) + 1) % 10))
        else:
            result.append(c)
    return ''.join(result)

def decrypt(s):
    result = []
    for c in s:
        if c.isalpha():
            # 处理字母
            is_upper = c.isupper()
            # 获取前一个字母，注意a/A的特殊情况
            prev_char = chr((ord(c.lower()) - ord('a') - 1) % 26 + ord('a'))
            # 改变大小写
            result.append(prev_char.upper() if not is_upper else prev_char.lower())
        elif c.isdigit():
            # 处理数字
            result.append(str((int(c) - 1) % 10))
        else:
            result.append(c)
    return ''.join(result)

while True:
    try:
        s1 = input()
        s2 = input()
        print(encrypt(s1))
        print(decrypt(s2))
    except EOFError:
        break

#include <iostream>
#include <string>
using namespace std;

string encrypt(string s) {
    string result;
    for (char c : s) {
        if (isalpha(c)) {
            // 处理字母
            bool isUpper = isupper(c);
            // 获取下一个字母
            char nextChar = (tolower(c) - 'a' + 1) % 26 + 'a';
            // 改变大小写
            result += isUpper ? tolower(nextChar) : toupper(nextChar);
        }
        else if (isdigit(c)) {
            // 处理数字
            result += ((c - '0' + 1) % 10) + '0';
        }
        else {
            result += c;
        }
    }
    return result;
}

string decrypt(string s) {
    string result;
    for (char c : s) {
        if (isalpha(c)) {
            // 处理字母
            bool isUpper = isupper(c);
            // 获取前一个字母
            char prevChar = (tolower(c) - 'a' - 1 + 26) % 26 + 'a';
            // 改变大小写
            result += isUpper ? tolower(prevChar) : toupper(prevChar);
        }
        else if (isdigit(c)) {
            // 处理数字
            result += ((c - '0' - 1 + 10) % 10) + '0';
        }
        else {
            result += c;
        }
    }
    return result;
}

int main() {
    string s1, s2;
    while (getline(cin, s1) && getline(cin, s2)) {
        cout << encrypt(s1) << endl;
        cout << decrypt(s2) << endl;
    }
    return 0;
}

import java.util.*;

public class Main {
    private static String encrypt(String s) {
        StringBuilder result = new StringBuilder();
        for (char c : s.toCharArray()) {
            if (Character.isLetter(c)) {
                // 处理字母
                boolean isUpper = Character.isUpperCase(c);
                // 获取下一个字母
                char nextChar = (char)((Character.toLowerCase(c) - 'a' + 1) % 26 + 'a');
                // 改变大小写
                result.append(isUpper ? Character.toLowerCase(nextChar) : Character.toUpperCase(nextChar));
            }
            else if (Character.isDigit(c)) {
                // 处理数字
                result.append((c - '0' + 1) % 10);
            }
            else {
                result.append(c);
            }
        }
        return result.toString();
    }
    
    private static String decrypt(String s) {
        StringBuilder result = new StringBuilder();
        for (char c : s.toCharArray()) {
            if (Character.isLetter(c)) {
                // 处理字母
                boolean isUpper = Character.isUpperCase(c);
                // 获取前一个字母
                char prevChar = (char)((Character.toLowerCase(c) - 'a' - 1 + 26) % 26 + 'a');
                // 改变大小写
                result.append(isUpper ? Character.toLowerCase(prevChar) : Character.toUpperCase(prevChar));
            }
            else if (Character.isDigit(c)) {
                // 处理数字
                result.append((c - '0' - 1 + 10) % 10);
            }
            else {
                result.append(c);
            }
        }
        return result.toString();
    }
    
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNextLine()) {
            String s1 = sc.nextLine();
            String s2 = sc.nextLine();
            System.out.println(encrypt(s1));
            System.out.println(decrypt(s2));
        }
    }
}