Create 1367-linked-list-in-binary-tree.js

Author: everthis

1367-linked-list-in-binary-tree.js

@@ -0,0 +1,43 @@
+/**
+ * Definition for singly-linked list.
+ * function ListNode(val, next) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.next = (next===undefined ? null : next)
+ * }
+ */
+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val, left, right) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.left = (left===undefined ? null : left)
+ *     this.right = (right===undefined ? null : right)
+ * }
+ */
+/**
+ * @param {ListNode} head
+ * @param {TreeNode} root
+ * @return {boolean}
+ */
+const isSubPath = function(head, root) {
+  const res = { found: false }
+  traverse(root, head, res)
+  return res.found
+};
+
+function traverse(node, list, res) {
+  if(res.found) return
+  if(node == null) return
+  if(node.val === list.val && helper(node, list)) {
+    res.found = true
+    return
+  } 
+  traverse(node.left, list, res)
+  traverse(node.right, list, res)
+}
+
+function helper(node, list) {
+  if(list == null) return true
+  if(node == null) return false
+  if(list.val !== node.val) return false
+  return helper(node.left, list.next) || helper(node.right, list.next)
+}