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List<Double> quadraticEquation(int a, int b, int c) {
    int det = b * b - 4 * a * c;
    List<Double> res = new ArrayList<>();
    if (det > 0) {
        res.add((-b - Math.sqrt(det)) / (2 * a));
        res.add((-b + Math.sqrt(det)) / (2 * a));
    } else if (det == 0) {
        res.add((double)-b / (2 * a));
    }
    Collections.sort(res);
    return res;
}