题解

#include <iostream>
#include <string>
#include <map>
#include <set>
using namespace std;
int main() {
string encrypted, original, toTranslate;
cin >> encrypted >> original >> toTranslate;
map<char, char> cipher;
map<char, char> reverseCipher;
bool failed = false;
for (int i = 0; i < original.size(); ++i) {
char o = original[i];
char e = encrypted[i];

    if (cipher.count(o)) {
        if (cipher[o] != e) {
            failed = true;
            break;
        }
    } else {
        if (reverseCipher.count(e)) {
            failed = true;
            break;
        }
        cipher[o] = e;
        reverseCipher[e] = o;
    }
}
if (!failed) {
    set<char> originalLetters(original.begin(), original.end());
    if (originalLetters.size() != 26) {
        failed = true;
    }
}

if (!failed) {
    string result;
    for (char c : toTranslate) {
        if (!reverseCipher.count(c)) {
            failed = true;
            break;
        }
        result += reverseCipher[c];
    }
    if (!failed) {
        cout << result << endl;
        return 0;
    }
}
cout << "Failed" << endl;
return 0;

}