Code mẫu

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

const int N = 105;

int m, k, cnt[N][26];
string s, t;
vector<int> ve;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    freopen("STRCOM.inp", "r", stdin);
    freopen("STRCOM.out", "w", stdout);
    cin >> m >> k >> s;
    while (m--) {
        cin >> t;
        int n = t.size(), ans = 0;
        ve.clear();
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < 26; j++) {
                cnt[i][j] = 0;
            }
        }
        for (int i = 0; i < s.size(); i++) {
            cnt[i % n][s[i] - 'a']++;
        }
        for (int i = 0; i < n; i++) {
            ans += cnt[i][t[i] - 'a'];
            ve.push_back(*max_element(cnt[i], cnt[i] + 26) - cnt[i][t[i] - 'a']);
        }
        sort(ve.begin(), ve.end(), greater<int>());
        if (k > ve.size()) {
            ans += accumulate(ve.begin(), ve.end(), 0);
        } else {
            ans += accumulate(ve.begin(), ve.begin() + k, 0);
        }
        cout << s.size() - ans << '\n';
    }
}