ignore non-alphanumeric

This commit is contained in:
Furaha Damién
2019-08-27 21:49:33 -04:00
parent 11864ca156
commit a4156fcb7a

View File

@ -22,4 +22,29 @@ class Palindrome {
return SecondWay(x.substring(1, x.length() - 1));
}
/**
* This method ignores all non-alphanumeric characters and case runs in O(n)
* where n is the length of s
*
* @param s String to check
* @return true if s is palindrome else false
*/
public boolean isPalindrome(String s) {
s = s.toLowerCase().trim();
StringBuilder sb = new StringBuilder();
for (char c : s.toCharArray()) {
if (Character.isLetter(c) || Character.isDigit(c))
sb.append(c);
}
s = sb.toString();
int start = 0;
int end = s.length() - 1;
while (start <= end) {
if (s.charAt(start++) != s.charAt(end--))
return false;
}
return true;
}
}