Hacking hashes

#include <algorithm>
#include <algorithm>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <string>

#define M 998244353
typedef long long int ll;
using namespace std;

ll F(string& s, ll A, ll B) {
    long long h = 0;
    for (char c : s) h = (h * A + c) % B;
    return h;
}

string generateRandomString(int length) {
    // Define the list of possible characters
    const string CHARACTERS =
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuv"
        "wxyz0123456789";

    // Create a random number generator
    random_device rd;
    mt19937 generator(rd());

    // Create a distribution to uniformly select from all
    // characters
    uniform_int_distribution<> distribution(
        0, CHARACTERS.size() - 1);

    // Generate the random string
    string random_string;
    for (int i = 0; i < length; ++i) {
        random_string += CHARACTERS[distribution(generator)];
    }

    return random_string;
}

int main() {
    ll A, B;
    cin >> A >> B;

    map<ll, string> m;

    while (true) {
        string s = generateRandomString(10);
        ll idx = F(s, A, B);
        if (m.find(idx) != m.end()) {
            cout << m[idx] << ' ' << s << endl;
            break;
        } else
            m.insert({idx, s});
    }
}

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Verdict: ACCEPTED

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Verdict: ACCEPTED

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Verdict: ACCEPTED

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Verdict: ACCEPTED