0680-valid-palindrome-ii.cs

public class Solution
{
    public bool ValidPalindrome(string s)
    {
        int leftPointer = 0;
        int rightPointer = s.Length - 1;
        while (leftPointer < rightPointer)
        {
            if (s[leftPointer] != s[rightPointer])
            {
                return IsPalindrome(s, leftPointer + 1, rightPointer) || IsPalindrome(s, leftPointer, rightPointer - 1);
            }
            leftPointer++;
            rightPointer--;
        }
        return true;
    }
    public bool IsPalindrome(String s, int leftPointer, int rightPointer)
    {
        while (leftPointer < rightPointer)
        {
            if (s[leftPointer] != s[rightPointer])
            {
                return false;
            }
            leftPointer++;
            rightPointer--;
        }
        return true;
    }
}