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.
SOLUTION:
class Solution:
def reverseString(self, s: List[str]) -> None:
n = len(s)
for i in range(n // 2):
s[i], s[n - i - 1] = s[n - i - 1], s[i]
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