From 2ee32d75a6ed2afc25a80f82e4a32ea7372ed8ca Mon Sep 17 00:00:00 2001
From: Matej Focko <me@mfocko.xyz>
Date: Sat, 7 Sep 2024 12:29:14 +0200
Subject: [PATCH] =?UTF-8?q?java:=20add=20=C2=AB1367.=20Linked=20List=20in?=
 =?UTF-8?q?=20Binary=20Tree=C2=BB?=
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Signed-off-by: Matej Focko <me@mfocko.xyz>
---
 java/ListNode.java                   | 15 +++++++++++
 java/linked-list-in-binary-tree.java | 37 ++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 java/ListNode.java
 create mode 100644 java/linked-list-in-binary-tree.java

diff --git a/java/ListNode.java b/java/ListNode.java
new file mode 100644
index 0000000..179e94e
--- /dev/null
+++ b/java/ListNode.java
@@ -0,0 +1,15 @@
+public class ListNode {
+  int val;
+  ListNode next;
+
+  ListNode() {}
+
+  ListNode(int val) {
+    this.val = val;
+  }
+
+  ListNode(int val, ListNode next) {
+    this.val = val;
+    this.next = next;
+  }
+}
diff --git a/java/linked-list-in-binary-tree.java b/java/linked-list-in-binary-tree.java
new file mode 100644
index 0000000..4f819db
--- /dev/null
+++ b/java/linked-list-in-binary-tree.java
@@ -0,0 +1,37 @@
+class Solution {
+  private boolean matches(ListNode head, TreeNode node) {
+    // linked list ran out ⇒ matches
+    if (head == null) {
+      return true;
+    }
+
+    // ran out of tree nodes ⇒ failed
+    if (node == null) {
+      return false;
+    }
+
+    // values don't match ⇒ failed
+    if (head.val != node.val) {
+      return false;
+    }
+
+    // check rest of the path
+    return matches(head.next, node.left) || matches(head.next, node.right);
+  }
+
+  public boolean isSubPath(ListNode head, TreeNode node) {
+    // cannot form a subpath
+    if (node == null) {
+      return false;
+    }
+
+    // check path starting from the current node
+    var result = matches(head, node);
+
+    // if doesn't match linked list, try from subtrees
+    result = result || isSubPath(head, node.left);
+    result = result || isSubPath(head, node.right);
+
+    return result;
+  }
+}