582. Kill Process

Given n processes, each process has a unique PID (process id) and its PPID (parent process id)

Each process only has one parent process, but may have one or more children processes. This is just like a tree structure. Only one process has PPID that is 0, which means this process has no parent process. All the PIDs will be distinct positive integers.

We use two list of integers to represent a list of processes, where t

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