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class Solution {
public:
bool isPalindrome(string s) {
vector<char> words;
if(s.empty()) return true;
for(int i = 0; i < s.length(); i++){
if(isalnum(s[i])){
words.push_back(tolower(s[i]));
}
}
if(words.empty()) return true;
auto l = words.begin();
auto r = words.end();
r--;
cout<<*r<<endl;
while(l <= r){
cout<<*l<<endl;
if(*l++ != *r--){
return false;
}
}
return true;
}
};
