"「SFCOI-1」Sadness Fan Club Round 1" reward code

reward.cpp

/**
 * @file reward.cpp
 * @author Macesuted (i@macesuted.moe)
 * @date 2023-03-11
 *
 * @copyright Copyright (c) 2023
 *
 */

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

int main() {
    mt19937 rnd(123456);
    int n;
    cin >> n;  // 符合要求的总人数
    set<int> S;
    for (int i = 0; i < 3; i++) {
        int p = rnd() % n;
        while (S.count(p)) p = (p + 1) % n;
        S.insert(p);
        cout << p + 1 << ' ';
    }
    cout << endl;
    return 0;
}