public class DayCode {    public static void main(String[] args) {        int[] answers = new int[]{1, 1, 2};        int ans = new DayCode().numRabbits(answers);        System.out.println("ans is " + ans);    }
    /**     * 时间复杂度 O(n log n)     * 空间复杂度 O(1)     * @param answers     * @return     */    public int numRabbits(int[] answers) {        int result = 0;        Arrays.sort(answers);        int n = answers.length;        for (int i = 0; i < n; i++) {            int cnt = answers[i];            result += cnt + 1;            int k = cnt;            while (k-- > 0 && i + 1 < n && answers[i] == answers[i + 1]) {                i++;            }        }        return result;    }
}