feat: solved 328

Author: fghpdf

src/com/fghpdf/OddEvenLinkedList/Solution.java

@@ -0,0 +1,30 @@
+package OddEvenLinkedList;
+
+import com.fghpdf.ListNode;
+
+/**
+ * @author fghpdf
+ * @date 2020/01/01
+ * @link https://leetcode.com/problems/odd-even-linked-list
+ * the problem donnot care the value in node, it just want to group odd even nodes by number.
+ * so it must first node is odd, second is even.
+ **/
+public class Solution {
+    public ListNode oddEvenList(ListNode head) {
+        if (head != null) {
+
+            ListNode odd = head;
+            ListNode even = head.next;
+            ListNode evenHead = even;
+
+            while (even != null && even.next != null) {
+                odd.next = odd.next.next;
+                even.next = even.next.next;
+                odd = odd.next;
+                even = even.next;
+            }
+            odd.next = evenHead;
+        }
+        return head;
+    }
+}