Leetcode - Valid Palindrome
https://leetcode.com/problems/valid-palindrome/
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" Output: true
Example 2:
Input: "race a car" Output: false
func isPalindrome(s string) bool {
i := 0
j := len(s)-1
for i < j {
for i < j && !(isLetter(s[i]) || (s[i] >= '0' && s[i] <= '9')) {
i++
}
for j > i && !(isLetter(s[j]) || (s[j] >= '0' && s[j] <= '9')) {
j--
}
if s[i] != s[j] {
if !isLetter(s[i]) && !isLetter(s[j]) {
return false
}
if (!isLetter(s[i]) && isLetter(s[j])) || (isLetter(s[i]) && !isLetter(s[j])) {
return false
}
if isLetter(s[i]) && isLetter(s[j]) && (s[i] + 32 != s[j]) && (s[i] - 32 != s[j]) {
return false
}
}
i++
j--
}
return true
}
func isLetter(s byte) bool {
return (s >= 'a' && s <= 'z') || (s >= 'A' && s <= 'Z')
}
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