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# Longest Bitonic Subsequence

## Problem Statement

Given a number sequence, find the length of its Longest Bitonic Subsequence (LBS). A subsequence is considered bitonic if it is monotonically increasing and then monotonically decreasing.

**Example 1:**

```
Input: {4,2,3,6,10,1,12}
Output: 5
Explanation: The LBS is {2,3,6,10,1}.
```

**Example 2:**

```
Input: {4,2,5,9,7,6,10,3,1}
Output: 7
Explanation: The LBS is {4,5,9,7,6,3,1}.
```

## Try it yourself

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