题目描述：

LeetCode 575. Distribute Candies

Given an integer array with even length, where different numbers in this array represent different kinds of candies. Each number means one candy of the corresponding kind. You need to distribute these candies equally in ...

题目描述：

LeetCode 577. Employee Bonus

Select all employee's name and bonus whose bonus is < 1000.

Table:Employee

+-------+--------+-----------+--------+
| empId |  name  | supervisor| salary |
+-------+--------+-----------+--------+
|   1   | John   |  3        | 1000   |
|   2   | Dan    |  3        | 2000   |
|   3   | Brad   |  null     | 4000   |
|   4   | Thomas |  3        | 4000   |
+-------+--------+-----------+--------+
empId is ...

fail2ban的默认iptables封禁策略为 REJECT --reject-with icmp-port-unreachable

在/etc/fail2ban/action.d/目录下创建文件 iptables-blocktype.local

内容如下：

[Init]
blocktype = DROP

重启fail2ban服务后，iptables封禁策略变更为DROP

题目描述：

LeetCode 571. Find Median Given Frequency of Numbers

The Numbers table keeps the value of number and its frequency.

+----------+-------------+
|  Number  |  Frequency  |
+----------+-------------|
|  0       |  7          |
|  1       |  1          |
|  2       |  3          |
|  3       |  1          |
+----------+-------------+

In this table, the numbers are 0, 0, 0, 0 ...

LeetCode Weekly Contest 30是LeetCode举办的第三十五场正式周赛，共4道题目，比赛时长1.5小时。

比赛链接：https://leetcode.com/contest/leetcode-weekly-contest-30/

题解列表：

LeetCode 566. Reshape the Matrix

LeetCode 560. Subarray Sum Equals K

LeetCode 567. Permutation in String

LeetCode 568. Maximum Vacation Days