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 with O(1) extra memory.
Example 1
Input
s = ["h","e","l","l","o"]Output
["o","l","l","e","h"]Reversing the characters in
s changes it from ["h","e","l","l","o"] to ["o","l","l","e","h"].Example 2
Input
s = ["H","a","n","n","a","h"]Output
["h","a","n","n","a","H"]Reversing the characters in
s changes it from ["H","a","n","n","a","h"] to ["h","a","n","n","a","H"].Constraints
- 1 <= s.length <= 10^5
- s[i] is a printable ascii character.
Asked at 15 companies
Practice questions like this out loud in a mock coding interview with a live AI interviewer. First one free.