Must-do problems: Lists

90 min · Beginner

These are the list problems every Python beginner should be able to solve, from a simple total to a spiral walk over a table. Trace each one on paper with a small list first, then check your program against every test.

What you will learn

Read a list from input and process it with a loop, a slice or a comprehension
Search, count and remove repeats without changing the order
Merge sorted lists and keep a moving total over a window
Build and walk a table stored as a list of lists

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