Leetcode 125 Solution

This article provides solution to leetcode question 125 (valid-palindrome)
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https://leetcode.com/problems/valid-palindrome

Solution

class Solution {
public:
    bool isPalindrome(string s) {
        string v;

        for (auto it = s.begin(); it != s.end(); it++)
        {
            if ('A' <= *it && *it <= 'Z')
            {
                v += *it - ('A' - 'a');
            }
            else if (('a' <= *it && *it <= 'z') || ('0' <= *it && *it <= '9'))
            {
                v += *it;
            }
        }

        int l = 0;
        int r = v.size() - 1;

        while (l <= r)
        {
            if (v[l++] != v[r--])
                return false;
        }

        return true;
    }
};