int luckBalance(int k, vector<vector<int>> contests) {
    int max_luck {0};
    multiset<int> important_contests;
    for (auto e : contests){
        if (e[1] == 0){
            max_luck += e[0];
        } else {
            important_contests.insert(e[0]);
        }
    }
    int i{0};
    int t;
    if (important_contests.size() > k)
        t = important_contests.size() - k;
    else t = 0;
    for (auto e : important_contests){
        if (i < t){
            max_luck -= e;
            ++i;
        } else {
            max_luck += e;
        }
    }
    return max_luck;
}