https://leetcode.com/problems/remove-palindromic-subsequences/

Solution.swift

class Solution {
    func removePalindromeSub(_ s: String) -> Int {
        guard s.count > 0 else { return 0 }
        if isPalindrome(s) { return 1 }
        return 2
    }

    private func isPalindrome(_ s: String) -> Bool {
        let b = "b".utf8CString[0]

        let utf = s.utf8CString.dropLast()
        var l = 0
        var r = utf.count - 1
        while utf[l] == utf[r], l<=r {
            l += 1
            r -= 1
        }
        
        return utf[l] == utf[r]
    }
}