At companies like Stripe, interviewers often ask you to justify not only that a solution works, but also how efficient it is. Clear time complexity analysis shows that you understand the algorithm beyond the code.
Explain the time complexity of your solution for a specific coding problem.
Address these points:
Give a practical interview-level explanation. You should be able to walk through a concrete solution, identify the dominant operations, simplify the expression using Big-O notation, and briefly mention space complexity if it materially affects the design.