17 lines
551 B
Markdown
17 lines
551 B
Markdown
Write a function that reverses a string. The input string is given as an array of characters `s`.
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You must do this by modifying the input array [in-place](https://en.wikipedia.org/wiki/In-place_algorithm) with `O(1)` extra memory.
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Example 1:
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Input: s = ["h","e","l","l","o"] Output: ["o","l","l","e","h"]
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Example 2:
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Input: s = ["H","a","n","n","a","h"] Output: ["h","a","n","n","a","H"]
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Constraints:
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* `1 <= s.length <= 105`
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* `s[i]` is a [printable ascii character](https://en.wikipedia.org/wiki/ASCII#Printable_characters).
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