1 files changed, 30 insertions, 0 deletions
diff --git a/challenge-129/lubos-kolouch/java/ch-1.java b/challenge-129/lubos-kolouch/java/ch-1.java
new file mode 100644
index 0000000000..dc905778f9
--- /dev/null
+++ b/challenge-129/lubos-kolouch/java/ch-1.java
@@ -0,0 +1,30 @@
+import java.util.*;
+
+class Main {
+  static Map<Integer, List<Integer>> tree = new HashMap<>();
+  static {
+    tree.put(1, Arrays.asList(2, 3));
+    tree.put(3, Arrays.asList(4));
+    tree.put(4, Arrays.asList(5, 6));
+  }
+
+  public static void main(String[] args) {
+    System.out.println(distance(6, 1, 0));
+    System.out.println(distance(5, 1, 0));
+    System.out.println(distance(2, 1, 0));
+    System.out.println(distance(4, 1, 0));
+  }
+
+  public static Integer distance(int node, int root, int dist) {
+    if (root == node)
+      return dist;
+    if (tree.containsKey(root)) {
+      for (int child : tree.get(root)) {
+        Integer d = distance(node, child, dist + 1);
+        if (d != null)
+          return d;
+      }
+    }
+    return null;
+  }
+}