Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.

For example,
"A man, a plan, a canal: Panama" is a palindrome.
"race a car" is not a palindrome. Note:
Have you consider that the string might be empty? This is a good question to ask during an interview. For the purpose of this problem, we define empty string as valid palindrome.


class Solution {
bool check(char test, char & c)
if(test >= 'a' && test <= 'z')
c = test;
return true;
}else if(test >= 'A' && test <= 'Z'){ c = test - 'A' + 'a';
return true;
}else if (test >= '' && test <= ''){ c = test;
return true;
return false;
bool isPalindrome(string s) {
// Start typing your C/C++ solution below
// DO NOT write int main() function
int j = s.length();
if(j-- == ) return true;
int i = ; char head,tail;
if(check(s[i],head)) break;
if(i>=j) return true; while(i<j){
if(check(s[j], tail)) break;
if(i>=j) return true;
if(head != tail ) return false;
return true ;

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