如何將string對象進行大小寫字母轉換。
template < class InputIterator, class OutputIterator, class UnaryOperator >
OutputIterator transform ( InputIterator first1, InputIterator last1,
OutputIterator result, UnaryOperator op );
class Solution {
public:
bool isPalindrome(string s) {
transform(s.begin(),s.end(),s.begin(),::tolower);
int l = 0,r = s.size()-1;
while(l<=r){
while(!check(s[l]) && l<=r){
l++;
}
while(!check(s[r]) && l<=r){
r--;
}
if(l>r){
break;
}
if(s[l]!=s[r]){
return false;
}
l++;
r--;
}
return true;
}
bool check(char c){
return (c>='0'&& c<='9') || (c>='a' && c<='z');
}
};