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PythonMediumLanguage Knowledge25.0% Success rate156 First attempts
42
8

Three by three

What is the value of grid after running this code?

1| grid = [[0] * 3] * 3
2| grid[0][0] = 3
[[3,0,0],[3,0,0],[3,0,0]]
[[3,3,3],[3,3,3],[3,3,3]]
[3,[0,0,0],[0,0,0]]
[[3,0,0],[0,0,0],[0,0,0]]

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  • This platform helped me solidify key concepts and refine my problem-solving skills, ultimately leading to 7 incredible job offers. The questions are well-structured and thought-provoking, making them perfect for reviewing and reinforcing knowledge. Instead of just memorizing answers, I was able to deeply understand the underlying principles, which proved invaluable during interviews.
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  • Just wanted to say thanks for building the platform — i've been using it quite a bit during my prep, and it really helped me a lot. recently got an internship offer at a hft (more infra-focused and not swe), and even though the exact questions didn't come up, the OS and networking ones on your site gave me a solid sense of the level of depth i needed. also helped guide what to google and dive deeper into, which i think came through in my interviews — got feedback that i seemed curious and well-prepped.
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  • getcracked.io helped me identify important gaps in my knowledge, and significantly broadened my exposure to advanced concepts, allowing me to make known previously unknown unknowns. The Q&A format was a significant part of what allowed me to ace my interviews and secure my internship offer.
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  • I was trying to pivot my career to something low level and performance critical, but wasn't having a lot of luck getting responses because of my Cloud-focused job experience. I replaced my nightly doomscroll with getcracked and found that even though I had a working knowledge of C++ and operating systems, I was lacking in the fundamental areas that really impress employers. I put together a study plan with the help of the resources list on getcracked, and within a couple months I had two competing offers (both 400K+ TC)! I've been at my new job for a few months now and I'm surprised how often I need to know the things that I learned from getcracked.
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  • Just received an offer from [Tier 1 Quant Firm]!! 600K+ TC. legit think I impressed them with my knowledge of CPU architecture/ cache structure/things like false sharing etc. half of which I got from getcracked. also have final round [Tier 2 Quant Firm A] and had to cancel final round with [Tier 2 Quant Firm B] cuz no time 😂. also, the discord came in clutch. lots of cracked people in there. The coding problems were especially useful in helping solidify concepts in a practical way. got asked to implement vector and blew away the interviewer when I voluntarily added move / copy semantics. I ended up teaching him about std::construct_at in C++20 as an alternative to placement new.
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