Valid Palindrome回文数
whowhoha@outlook.com
Question:
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.
解决方法：使用两个指针，分别指向头尾，然后向中间移动依次判断
int isPalindrome(string s)
{
int i=0,j=s.size()-1;
if (j==0)
{
return 0;
}
while(i<j)
{
if (s[i++] != s[j--])
{
return 0;
}
}
return 1;
}