# 0582. Kill Process

https://leetcode.com/problems/kill-process

## Description

You have `n` processes forming a rooted tree structure. You are given two integer arrays `pid` and `ppid`, where `pid[i]` is the ID of the `ith` process and `ppid[i]` is the ID of the `ith` process's parent process.

Each process has only **one parent process** but may have multiple children processes. Only one process has `ppid[i] = 0`, which means this process has **no parent process** (the root of the tree).

When a process is **killed**, all of its children processes will also be killed.

Given an integer `kill` representing the ID of a process you want to kill, return _a list of the IDs of the processes that will be killed. You may return the answer in **any order**._

**Example 1:**

![](https://assets.leetcode.com/uploads/2021/02/24/ptree.jpg)

```
**Input:** pid = [1,3,10,5], ppid = [3,0,5,3], kill = 5
**Output:** [5,10]
**Explanation:** The processes colored in red are the processes that should be killed.
```

**Example 2:**

```
**Input:** pid = [1], ppid = [0], kill = 1
**Output:** [1]
```

**Constraints:**

* `n == pid.length`
* `n == ppid.length`
* `1 <= n <= 5 * 104`
* `1 <= pid[i] <= 5 * 104`
* `0 <= ppid[i] <= 5 * 104`
* Only one process has no parent.
* All the values of `pid` are **unique**.
* `kill` is **guaranteed** to be in `pid`.

## ac

```java
```
