문제
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 with O(1) extra memory.
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.
문자열을 반대로 정렬하라고 한다.
opposite direction로 작성했다.
class Solution:
def reverseString(self, s: List[str]) -> None:
left = 0
right = len(s) - 1
while(left < right):
s[left], s[right] = s[right], s[left]
left += 1
right -= 1
