917. Reverse Only Letters

Given a string S, return the "reversed" string where all characters that are not a letter stay in the same place, and all letters reverse their positions.

Example 1:

Input: "ab-cd"
Output: "dc-ba"

Example 2:

Input: "a-bC-dEf-ghIj"
Output: "j-Ih-gfE-dCba"

Example 3:

Input: "Test1ng-Leet=code-Q!"
Output: "Qedo1ct-eeLg=ntse-T!"

Note:

1. S.length <= 100
2. 33 <= S[i].ASCIIcode <= 122
3. S doesn't contain \ or "

# @lc code=start
using LeetCode

function reverse_only_letters(s::String)
    chars = codeunits(s)[:]
    letters = @view(chars[isletter.(Char.(chars))])
    reverse!(letters)
    return String(chars)
end
# @lc code=end

reverse_only_letters (generic function with 1 method)

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