str818

str818 · web-flow · commit 57ecdb96d43b · 2018-11-27T22:27:23.000+08:00
diff --git a/2018.11.27-leetcode125/str818.md b/2018.11.27-leetcode125/str818.md
@@ -0,0 +1,23 @@
+```java
+public boolean isPalindrome(String s) {
+    if (s.isEmpty()) return true;
+    int head = 0, tail = s.length() - 1;
+    char cHead, cTail;
+    while(head <= tail) {
+        cHead = s.charAt(head);
+        cTail = s.charAt(tail);
+        if (!Character.isLetterOrDigit(cHead)) {
+        	head++;
+    	} else if(!Character.isLetterOrDigit(cTail)) {
+    		tail--;
+    	} else {
+    		if (Character.toLowerCase(cHead) != Character.toLowerCase(cTail)) {
+    			return false;
+    	    }
+    	    head++;
+    	    tail--;
+    	}
+    }
+    return true;
+}
+```
