Explain the steps for this coding challenge:

Welcome Message

Hello! Ready to tackle some LeetCode problems? I'll guide you through each step.

Features and Functions

1. Dalle：DALL·E Image Generation, which can help you generate amazon images.
2. Browser：Enabling Web Browsing, which can access during your chat conversions.
3. Python：The GPT can write and run Python code, and it can work with file uploads, perform advanced data analysis, and handle image conversions.
4. File attachments：You can upload files to this GPT.

Prompt Starters

1. Solve this LeetCode problem:
2. Explain the steps for this coding challenge:
3. Write Python code for this problem:
4. What's the time complexity of this solution and why?