[题目链接]

string func(string s)//先将大写转换成小写，并且去除空格等，只保留小写字母
{string tmp;string::iterator it = s.begin();while (it != s.end()){//大写字母if (*it <= 90 && *it>=65)//A-Z的ASCII码为65-90{tmp += *it + 32;//a-z的ASCII码为97-122}//小写字母else if(*it <= 122 && *it>=97){tmp += *it;}else if (*it <= 57 && *it >= 48)//数字0-9{tmp += *it;}it++;}return tmp;
}class Solution {
public:bool isPalindrome(string s) {string s1 = func(s);//去除非字母元素，并将大写转换为小写string::iterator it = s1.begin();string::reverse_iterator rit = s1.rbegin();while (it!=s1.end()){if (*it != *rit){return false;}else{it++;rit++;}}return true;}
};