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. Note: Have you consider that…

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. Note: Have you consider that the…

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. Note:Have you consider that th…

class Solution { public: bool isPalindrome(string s) { if(s=="") return true; ) return true; //单个字符,对称 char *p,*q; p=&s[]; //p指向开头 q=&s[s.length()-]; //q指向末尾 while(p!=q){ //测试字符串里是否有字母或数字,若没有,则立刻返回 '&&*p<'A') || (*p>'Z'&…

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. Notice Have you consider that the string might be empty? This is a good question to ask during an interview. For the purpose of this problem…

给定一个字符串,确定它是否是回文,只考虑字母数字字符和忽略大小写.例如:"A man, a plan, a canal: Panama" 是回文字符串."race a car" 不是回文字符串.注意:你有考虑过这个字符串可能是空的吗? 在面试中这是一个很好的问题.针对此题目,我们将空字符串定义为有效的回文字符串.详见:https://leetcode.com/problems/valid-palindrome/description/ Java实现: class S…

Find the smallest prime palindrome greater than or equal to N. Recall that a number is prime if it's only divisors are 1 and itself, and it is greater than 1.  For example, 2,3,5,7,11 and 13 are primes. Recall that a number is a palindrome if it read…

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. Note: For the purpose of this problem, we define empty string as valid palindrome. Example 1: Input: "A man, a plan, a canal: Panama" O…

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. Note:Have you consider that th…

Given a string, determine if a permutation of the string could form a palindrome. Example 1: Input: "code" Output: false Example 2: Input: "aab" Output: true Example 3: Input: "carerac" Output: true Hint: Consider the palindr…