Leetcode: Valid palindrome

1. Handle empty strings;

2. Note that it is the alphanumeric character;

3. You can add a character to the string directly with +;

1 class solution: 2 # @ Param S, a string 3 # @ return a Boolean 4 def ispalindrome (self, S): 5 ret = False 6 S = S. lower () 7 SS = "" 8 For I in S: 9 if I. isalnum (): 10 SS + = i11 H = 012 E = Len (SS)-113 while (H <E ): 14 if (ss [H] = ss [e]): 15 h + = 116 e-= 117 else: 18 break19 if h> = E: 20 ret = true21 return ret

 

Leetcode: Valid palindrome