125. Valid Palindrome
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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.
class Solution
{
public:
bool isPalindrome(string s)
{
int left;
int right;
left=0;
right=s.size()-1;
while(left<=right)
{
while(left<right&&isalnum(s[left])==0)
left++;
while(left<right&&isalnum(s[right])==0)
right--;
if(toupper(s[left]) != toupper(s[right]))
return false;
left++;
right--;
}
return true;
}
};
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