题解 | #简单密码#

#include<bits/stdc++.h>
using namespace std;

//该函数用于将密文翻译为明文
vector<char> translate(string s) {
    vector<char> result;
    unordered_map<char, char> letter = {//记录密文与明文的对应关系
        {'A', 'V'}, {'B', 'W'}, {'C', 'X'}, {'D', 'Y'}, {'E', 'Z'}, {'F', 'A'},
        {'G', 'B'}, {'H', 'C'}, {'I', 'D'}, {'J', 'E'}, {'K', 'F'}, {'L', 'G'},
        {'M', 'H'}, {'N', 'I'}, {'O', 'J'}, {'P', 'K'}, {'Q', 'L'}, {'R', 'M'},
        {'S', 'N'}, {'T', 'O'}, {'U', 'P'}, {'V', 'Q'}, {'W', 'R'}, {'X', 'S'},
        {'Y', 'T'}, {'Z', 'U'}
    };
    for (char c : s) {//遍历密文字符串
        if (isalpha(
                    c)) {//如果该字符是字母，则通过对应关系转换为明文
            result.push_back(letter[c]);
        } else {//如果该字符不是字母，则照常输出
            result.push_back(c);
        }
    }
    return result;
}
int main() {
    string str;
    vector<char> result;
    while (getline(cin, str)) {
        if (str == "ENDOFINPUT") {
            break;
        }
        if (str != "START" && str != "END") {
            result = translate(str);//翻译密文
            for (auto iter = result.begin(); iter != result.end();
                    iter++) {//将转换的结果输出
                cout << *iter;
            }
            cout << endl;
        }
    }
}