Initial commit

1 files changed, 62 insertions, 0 deletions

diff --git a/MergeLists.java b/MergeLists.java
new file mode 100644
index 0000000..e939511
--- /dev/null
+++ b/MergeLists.java
@@ -0,0 +1,62 @@
+import java.lang.*;
+import java.util.*;
+import node.*;
+
+class MergeLists {
+	public static ListNode mergeTwoLists(ListNode list1, ListNode list2) {
+		if (list1 == null && list2 == null)
+			return new ListNode();
+		else if (list1 == null)
+			return list2;
+		else if (list2 == null)
+			return list1;
+
+		ListNode curr1 = list1;
+		ListNode curr2 = list2;
+
+		ListNode head;
+		if (curr1.val < curr2.val) {
+			head = curr1;
+			curr1 = curr1.next;
+		} else {
+			head  = curr2;
+			curr2 = curr2.next;
+		}
+
+		ListNode node = head;
+		while (curr1 != null && curr2 != null) {
+			if (curr1.val < curr2.val) {
+				node.next = curr1;
+				curr1 = curr1.next;
+			} else {
+				node.next = curr2;
+				curr2 = curr2.next;
+			}
+			node = node.next;
+		}
+
+		if (curr1 == null) {
+			node.next = curr2;
+		} else {
+			node.next = curr1;
+		}
+
+		return head;
+	}
+
+	public static void main(String[] args) {
+		ListNode second1 = new ListNode(4, null);
+		ListNode first1 = new ListNode(2, second1);
+		ListNode list1 = new ListNode(1, first1);
+
+		ListNode second2 = new ListNode(4, null);
+		ListNode first2 = new ListNode(3, second2);
+		ListNode list2 = new ListNode(1, first2);
+
+		ListNode curr = mergeTwoLists(list1, list2);
+		while (curr != null) {
+			System.out.println(curr.val);
+			curr = curr.next;
+		}
+	}
+}