.NET Interview Questions | Best Time to Buy and Sell Stock II in C# | Brute Force to Greedy

Preparing for your next C# .NET interview? This C# coding question has been asked multiple times in interviews at different companies. In this walkthrough, we solve Best Time to Buy and Sell Stock II in C# (LeetCode 122), moving from brute force to an optimized greedy solution. For developers practising C# interview questions and DSA, we explain the problem step by step—from brute force to an optimized greedy solution—with animated dry runs and C# coding in LeetCode. 📺 WATCH PART 1 — ONE TRANSACTION Build the foundation with Best Time to Buy and Sell Stock in C#:    • C# .NET Interview Question: Best Time to B...   🎯 COMPANY INTERVIEW QUESTIONS PLAYLIST Preparing for .NET interviews at Deloitte, Capgemini, Accenture, Cognizant, and other companies? Explore our company interview questions playlist:    • .NET Interview Questions & Real Experience...   In Part 2, multiple transactions are allowed—but you can hold only one stock at a time. How does that change your approach? WHAT YOU’LL LEARN • Single transaction vs multiple transactions • Available choices: buy, sell, hold, or skip • How brute force explores those choices • Implementing the brute-force solution in C# • Discovering why the greedy approach works • A dry run of price comparisons and profit updates • Implementing and testing the optimized C# solution in LeetCode • Greedy solution complexity: O(n) time and O(1) extra space 💬 Why does adding every positive difference between consecutive prices give the maximum profit? Explain your reasoning in the comments. ABOUT DOTNET DECODE We break down interview questions and problem-solving approaches for .NET developers with 3–8 years of experience, focusing on what interviewers test and how to explain your reasoning. Explore: • C# interview questions and DSA • ASP.NET Core architecture • Backend system design: scalability and reliability • Microservices patterns and performance • Angular + .NET full-stack integration Subscribe for upcoming interview-question walkthroughs and our Angular + .NET full-stack application series—especially if you’re preparing to transition from service to product companies. #DotNetInterview #CSharp #DSA