Umsindo ohlukanisiwe

POV: Your interviewer starts with Two Sum. If you can’t solve Two Sum in your sleep, are you even a software engineer? This is the "Hello World" of interviews, but most people still get roasted on the time complexity. Let’s fix that in 45 seconds. We need two numbers that add up to a target. The brute force way? A nested loop, checking every single pair. That’s big O of n squared complexity. Your interviewer just died inside. Don't do this. Instead, use a Hash Map. In Python, that’s just a dicti