reverse string python leetcode

Leetcode Reverse String problem not accepting in-place solution

stackoverflow.com › questions › 72150559 › leetcode-reverse-string-problem-not-accepting-in-place-solution

Question is saying do not return anything that means you need to do inplace reversing. Also this is list of string not a string so whatever you change inside function it will be reflected in the list because lists are mutable.

Correct Solution will be

class Solution:
    def reverseString(self, s: List[str]) -> None:
        """
        Do not return anything, modify s in-place instead.
        """
        s.reverse()

Also If you want to do in your style then correct line will be

s[:] = s[::-1]

Answer from Deepak Tripathi on Stack Overflow

LeetCode

leetcode.com › problems › reverse-string

Reverse String - LeetCode

Reverse String - Write a function that reverses a string. The input string is given as an array of characters s. You must do this by modifying the input array in-place [https://en.wikipedia.org/wiki/In-place_algorithm] with O(1) extra memory.

reddit.com › r/learnpython › reversing a string leetcode question

r/learnpython on Reddit: reversing a string LeetCode question

May 9, 2023 -

So the code goes:

s = [“h”, ”e”, ”l”, ”l”, ”o”]

s[:] = s[::-1] print(s)

This prints the reverse of s in both VSCode and on the LeetCode website ide

I tried to see if the follow would work:

s = [“h”, ”e”, ”l”, ”l”, ”o”]

s = s[::-1] print(s)

This did work but only on VSCode not on leet code. So my question is why did it work in VSCode and not LeetCode?

There’s other solutions I tried to the problem that work in VSCode but not in LeetCode shock I find it odd, am I doing something I shouldn't?

Videos

06:10

YouTube

Reverse String | Iterative & Recursive | Leetcode June Day 04 | ...

LeetCode 344: Reverse String [Python] - YouTube

leetcode.com › problems › reverse-words-in-a-string

Reverse Words in a String - LeetCode

Can you solve this real interview question? Reverse Words in a String - Given an input string s, reverse the order of the words. A word is defined as a sequence of non-space characters.

Stack Overflow

stackoverflow.com › questions › 72150559 › leetcode-reverse-string-problem-not-accepting-in-place-solution

python - Leetcode Reverse String problem not accepting in-place solution - Stack Overflow

Top answer

1 of 3

4

Question is saying do not return anything that means you need to do inplace reversing. Also this is list of string not a string so whatever you change inside function it will be reflected in the list because lists are mutable.

Correct Solution will be

class Solution:
    def reverseString(self, s: List[str]) -> None:
        """
        Do not return anything, modify s in-place instead.
        """
        s.reverse()

Also If you want to do in your style then correct line will be

s[:] = s[::-1]

2 of 3

1

The first solution creates a new list and does not change the parameter (which also feels cleaner).

Edit: Never mind the following part. It won't do anything. Thanks.

However you could do something like

s = s[::-1]

instead of the return statement.

LeetCode

leetcode.com › problems › reverse-string-ii

Reverse String II - LeetCode

Reverse String II - Given a string s and an integer k, reverse the first k characters for every 2k characters counting from the start of the string. If there are fewer than k characters left, reverse all of them.

AlgoMap

algomap.io › problems › reverse-string

Reverse String - Leetcode Solution

The optimal way to reverse a string in-place is by using the two-pointer technique.

GitHub

github.com › yizhou-wang › LeetCode › blob › master › Python › reverse-string.py

LeetCode/Python/reverse-string.py at master · yizhou-wang/LeetCode

:pencil: Python / C++ 11 Solutions of All LeetCode Questions - LeetCode/Python/reverse-string.py at master · yizhou-wang/LeetCode

Author yizhou-wang

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AlgoMonster

algo.monster › liteproblems › 344

344. Reverse String - In-Depth Explanation

In-depth solution and explanation for LeetCode 344. Reverse String in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions.

YouTube

youtube.com › watch

Reverse String - 3 Ways - Leetcode 344 - Python - YouTube

09:03

🚀 https://neetcode.io/ - A better way to prepare for Coding Interviews⭐ BLIND-75 PLAYLIST: https://www.youtube.com/watch?v=KLlXCFG5TnA&list=PLot-Xpze53ldVwt...

Published April 1, 2022

DEV Community

dev.to › ranggakd › reverse-string-leetcode-python-418m

Reverse String | LeetCode | Python - DEV Community

May 17, 2023 - class Solution: def reverseString(self, s: List[str]) -> None: l = len(s) for i in range(l//2): if s[i] != s[l-1-i]: s[i], s[l-1-i] = s[l-1-i], s[i]

LeetCode

leetcode.com › problems › reverse-words-in-a-string-iii

Reverse Words in a String III - LeetCode

Can you solve this real interview question? Reverse Words in a String III - Given a string s, reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.

GitHub

github.com › kamyu104 › LeetCode-Solutions › blob › master › Python › reverse-string.py

LeetCode-Solutions/Python/reverse-string.py at master · kamyu104/LeetCode-Solutions

🏋️ Python / Modern C++ Solutions of All 3822 LeetCode Problems (Weekly Update) - LeetCode-Solutions/Python/reverse-string.py at master · kamyu104/LeetCode-Solutions

Author kamyu104

WalkCCC

walkccc.me › LeetCode › problems › 344

344. Reverse String - LeetCode Solutions

LeetCode Solutions in C++23, Java, Python, MySQL, and TypeScript.

Gitbooks

dxmahata.gitbooks.io › leetcode-python-solutions › content › reverse_string.html

Reverse String · Leetcode Python Solutions

Write a function that takes a string as input and returns the string reversed. Example: Given s = "hello", return "olleh". URL: https://leetcode.com/problems/reverse-string/

YouTube

youtube.com › deepti talesra

Reverse String #leetcode - YouTube

Explaining Reverse String from leetcode in Python! LeetCode 344Code: https://github.com/deepti-talesra/LeetCode/blob/master/Reverse_String.py@1:17 - Example ...

Published March 5, 2025

YouTube

youtube.com › watch

Reverse Words in a String - LeetCode 151 - Python #leetcode75 - YouTube

04:16

Explaining how to solve Reverse Words in a String from leetcode in Python! Code: https://github.com/deepti-talesra/LeetCode/blob/master/Reverse_Words_in_a_St...

Published November 1, 2024

YouTube

youtube.com › watch

Reverse String - Leetcode 344 - 2 Pointers - (Python) - YouTube

04:37

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Published April 17, 2024

LeetCode

leetcode.com › problems › reverse-vowels-of-a-string

Reverse Vowels of a String - LeetCode

Reverse Vowels of a String - Given a string s, reverse only all the vowels in the string and return it. The vowels are 'a', 'e', 'i', 'o', and 'u', and they can appear in both lower and upper cases, more than once.

Medium

lydiaplu.medium.com › leetcode-541-reverse-string-ii-24a879b40fdd

LeetCode — 541. Reverse String II | by Pan Lu | Medium

January 31, 2024 - Reversing Characters: The characters between left and right are then reversed using a while loop and a temporary variable for swapping. Returning the Result: After all segments are processed, the character array is returned to a string.

YouTube

youtube.com › watch

Reverse Words in a String III - Leetcode 557 - Python - YouTube

10:18

🚀 https://neetcode.io/ - A better way to prepare for Coding Interviews🥷 Discord: https://discord.gg/ddjKRXPqtk🐦 Twitter: https://twitter.com/neetcode1🐮 S...

Published October 1, 2023