题解 | #简单密码#

#include <iostream>
#include <cctype>
#include <string>

using std::cin;
using std::cout;
using std::endl;
using std::string;

// Function to process the string and apply transformations
void process_string(const string& str) {
    for (auto it = str.begin(); it != str.end(); it++) {
        if (isdigit(*it)) {
            cout << *it; // Output digits as they are
        } else if (islower(*it)) {
            // Convert lowercase letters to numbers according to the pattern
            if ('a' <= *it && *it <= 'c') {
                cout << 2;
            } else if ('d' <= *it && *it <= 'f') {
                cout << 3;
            } else if ('g' <= *it && *it <= 'i') {
                cout << 4;
            } else if ('j' <= *it && *it <= 'l') {
                cout << 5;
            } else if ('m' <= *it && *it <= 'o') {
                cout << 6;
            } else if ('p' <= *it && *it <= 's') {
                cout << 7;
            } else if ('t' <= *it && *it <= 'v') {
                cout << 8;
            } else if ('w' <= *it && *it <= 'z') {
                cout << 9;
            }
        } else if (isupper(*it)) {
            // Shift uppercase letters by one position, wrap around from 'Z' to 'A'
            if (*it == 'Z') {
                cout << 'a';
            } else {
                char ch = (*it) + 1;

                ch = tolower(ch);
                cout << ch;
            }
        } else {
            cout << *it; // Output other characters as they are
        }
    }
}

int main() {
    string str;

    getline(cin, str);
    process_string(str);
    return 0;
}