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48 lines
968 B
Python
48 lines
968 B
Python
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"""
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344. Reverse String
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Difficulty: Easy
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https://leetcode.com/problems/reverse-string/
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──────────────────────────────────────────────────
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Write a function that reverses a string. The input string is given as
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an array of characters s.
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You must do this by modifying the input array in-place with O(1)
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extra memory.
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Example 1:
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Input: s = ["h","e","l","l","o"]
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Output: ["o","l","l","e","h"]
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Example 2:
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Input: s = ["H","a","n","n","a","h"]
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Output: ["h","a","n","n","a","H"]
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Constraints:
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• 1 <= s.length <= 10^5
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• s[i] is a printable ascii character.
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"""
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class Solution:
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def reverseString(self, s: List[str]) -> None:
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l = 0
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r = len(s) - 1
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while l < r:
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s[l], s[r] = s[r], s[l]
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l += 1
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r -= 1
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"""
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Do not return anything, modify s in-place instead.
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"""
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