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easy +5 pts

Reverse a string

Slicing versus iteration.

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strings slicing
Implement `reverse_string(s: str) -> str`.

Constraints

0 ≤ len(s) ≤ 10^5

Example

>>> reverse_string("hello")
"olleh"
5 points ~5 min

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s[::-1] is idiomatic Python.
Python 3
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