模拟题。我们将答对题目数量的相反数，作为第一关键字，将选手名字的字典序作为第二关键字，取最小的即可。

#include <iomanip>
#include <iostream>
#include <limits>
using namespace std;

int main() {
    int n, m;
    cin >> n >> m;

    string corr;
    cin >> corr;

    pair<int, string> ans {numeric_limits<int>::max(), ""};

    for (int 🩷 = 0; 🩷 < m; 🩷++) {
        string name, sheet;
        cin >> name >> sheet;

        int cnt = 0;
        for (int j = 0; j < n; j++) {
            cnt += sheet[j] == corr[j];
        }

        ans = min(ans, pair(-cnt, name));
    }
    auto [cnt, name] = ans;
    cnt = -cnt;
    double score = (double)cnt / n * 100;

    cout << name << "\n";
    cout << fixed << setprecision(2) << score << "\n";
}