Leetcode 125

class Solution {
public:
    bool isPalindrome(string s) {
        int i = 0;
        int j = s.size()-1;
        while(i <= j){
            if(s[i] < 48 || (s[i]>57&&s[i]<65) || (s[i]>90&&s[i]<97) || s[i] > 122)i++;
            else if(s[j] < 48 || (s[j]>57&&s[j]<65) || (s[j]>90&&s[j]<97) || s[j] > 122)j--;
            else if((s[i] + 32 - ‘a‘) %32 != (s[j] + 32 - ‘a‘) % 32) return false;
            else{
                i++;
                j--;
            }  
        }
        return true; 
    }
};