344. Reverse String

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

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

You may assume all the characters consist of printable ascii characters.

Example 1:

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

Example 2:

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

# @lc code=start
using LeetCode

function reverse_string!(s::Vector{Char})::Nothing
    n = length(s)
    for i in 1:(n ÷ 2)
        s[i], s[end - i + 1] = s[end - i + 1], s[i]
    end
    return nothing
end

# @lc code=end

reverse_string! (generic function with 1 method)

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