[Leetcode] 344.Reverse String

문자열 뒤집기

344. Reverse String

https://leetcode.com/problems/reverse-string/

Write a function that reverses a string. The input string is given as an array of characters s.

 

Example 1:

Input: s = ["h","e","l","l","o"] Output: ["o","l","l","e","h"]

Example 2:

Input: s = ["H","a","n","n","a","h"] Output: ["h","a","n","n","a","H"]

 

Constraints:

• 1 <= s.length <= 105
• s[i] is a printable ascii character.

 

Follow up: Do not allocate extra space for another array. You must do this by modifying the input array in-place with O(1) extra memory.

-----------------------------------------------------------------------------------------------------------------------------------

 

풀이 1. 투 포인터를 이용한 스왑

def reverseString(self, s: list[str]) -> None:
    left, right =0, len(s) -1
    while left < right:
        s[left], s[right] = s[right], s[left]
        left += 1
        right -= 1

 

풀이 2. 파이썬 다운 방식

def reverseString(self, s: list[str]) -> None:
    s.reverse()