题解 | #字符串加密#

按题意模拟即可

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

int main() {
    string k, s;
    cin >> k >> s;
    vector<char> alphabet;
    unordered_set<char> seen;
    for (auto& ch: k) {
        if (!seen.count(ch)) {
            seen.insert(ch);
            alphabet.push_back(ch);
        }
    }
    int n = alphabet.size();
    for (char c = 'a'; c <= 'z'; c++) {
        if (n < 26 && !seen.count(c)) {
            alphabet.push_back(c);
        }
    }
    string ans = "";
    for (auto& ch: s) ans += alphabet[ch-'a'];
    cout << ans;
    return 0;
}