1 files changed, 49 insertions, 0 deletions
diff --git a/challenge-129/lubos-kolouch/java/ch-2.java b/challenge-129/lubos-kolouch/java/ch-2.java
new file mode 100644
index 0000000000..53a0798f94
--- /dev/null
+++ b/challenge-129/lubos-kolouch/java/ch-2.java
@@ -0,0 +1,49 @@
+import java.util.*;
+
+class Main {
+  static class LinkedList {
+    int value;
+    LinkedList next;
+
+    LinkedList(int value, LinkedList next) {
+      this.value = value;
+      this.next = next;
+    }
+
+    LinkedList add(LinkedList other) {
+      int carry = 0;
+      LinkedList head = new LinkedList(0, null), tail = head;
+      while (this != null || other != null || carry != 0) {
+        int sum = (this != null ? this.value : 0) +
+                  (other != null ? other.value : 0) + carry;
+        tail.next = new LinkedList(sum % 10, null);
+        tail = tail.next;
+        carry = sum / 10;
+        this = this != null ? this.next : null;
+        other = other != null ? other.next : null;
+      }
+      return head.next;
+    }
+
+    @Override
+    public String toString() {
+      LinkedList node = this;
+      List<String> values = new ArrayList<>();
+      while (node != null) {
+        values.add(Integer.toString(node.value));
+        node = node.next;
+      }
+      return String.join(" -> ", values);
+    }
+  }
+
+  public static void main(String[] args) {
+    LinkedList l1 =
+        new LinkedList(1, new LinkedList(2, new LinkedList(3, null)));
+    LinkedList l2 =
+        new LinkedList(3, new LinkedList(2, new LinkedList(1, null)));
+
+    LinkedList result = l1.add(l2);
+    System.out.println(result);
+  }
+}