# 1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree

<https://leetcode.com/problems/check-if-a-string-is-a-valid-sequence-from-root-to-leaves-path-in-a-binary-tree>

## Description

Given a binary tree where each path going from the root to any leaf form a **valid sequence**, check if a given string is a **valid sequence** in such binary tree.&#x20;

We get the given string from the concatenation of an array of integers `arr` and the concatenation of all values of the nodes along a path results in a **sequence** in the given binary tree.

**Example 1:**

![](https://assets.leetcode.com/uploads/2019/12/18/leetcode_testcase_1.png)

```
**Input:** root = [0,1,0,0,1,0,null,null,1,0,0], arr = [0,1,0,1]
**Output:** true
**Explanation:**The path 0 -> 1 -> 0 -> 1 is a valid sequence (green color in the figure). 
Other valid sequences are: 
0 -> 1 -> 1 -> 0 
0 -> 0 -> 0
```

**Example 2:**

![](https://assets.leetcode.com/uploads/2019/12/18/leetcode_testcase_2.png)

```
**Input:** root = [0,1,0,0,1,0,null,null,1,0,0], arr = [0,0,1]
**Output:** false 
**Explanation:** The path 0 -> 0 -> 1 does not exist, therefore it is not even a sequence.
```

**Example 3:**

![](https://assets.leetcode.com/uploads/2019/12/18/leetcode_testcase_3.png)

```
**Input:** root = [0,1,0,0,1,0,null,null,1,0,0], arr = [0,1,1]
**Output:** false
**Explanation:** The path 0 -> 1 -> 1 is a sequence, but it is not a valid sequence.
```

**Constraints:**

* `1 <= arr.length <= 5000`
* `0 <= arr[i] <= 9`
* Each node's value is between \[0 - 9].

## ac

```java
```