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Tested Python solution for LeetCode 344 with 15 pytest cases. Generate a practice environment with lcpy.
lcpy gen -n 344 # by problem number
lcpy gen -s reverse_string # by problem name
s.
You must do this by modifying the input array in-place with O(1) extra memory.
Input: s = ["h","e","l","l","o"]
Output: ["o","l","l","e","h"]
Input: s = ["H","a","n","n","a","h"]
Output: ["h","a","n","n","a","H"]
class Solution:
# Time: O(n)
# Space: O(1)
def reverse_string(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
| Time | Space |
|---|---|
| O(n) | O(1) |