Command Processing for App Open/Close

MediumPython

Problem

Write a function that processes a sequence of application commands to open apps, close a specified number of recently opened apps, and clear all currently open applications. Use OPEN app, CLOSE k, and CLEAR commands. Return the remaining app names in opening order. The function accepts a list of command strings and returns a list of strings.

Constraints

1 <= len(commands) <= 5000
Each command is either OPEN app, CLOSE k, or CLEAR.
app is a non-empty string without spaces.
k is a non-negative integer.
Applications may be opened more than once.
A CLOSE command requesting at least the number of open applications empties the list.

Function Signature

def process_commands(commands):

CodePython 3

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