Keep meaningful lines
Difficulty: Easy
Return nonblank input lines with leading/trailing whitespace removed, in original order. Preserve internal spaces and duplicate lines.
Examples
[][][' a b ', ' ', 'a']['a b', 'a']['\tÉ\n', 'É']['É', 'É']Constraints
Use only Python standard-library modules. Inputs contain at most 1,000 records and 100,000 characters unless stated otherwise. Do not mutate input objects. Return the specified JSON-compatible value; do not print it.
Review lesson: Designing small automation tasks and input/output contractsA little nudge
Reveal one hint at a time. Give yourself a moment to try it.
Worked solution
Try your own approach first, then compare the reasoning.
Complexity
Ready when you are
Write your solution, then run it against the practice tests.
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