What went well
- I know how DP works?!
- I failed to read B correctly the first time. The problem is about Set (the game), which I have only played once, over 10 years ago. I thought that all features had to be same or different, instead of each feature being independent of each other.
- I took an hour to debug C because I wasn't confident in my dp transition function. Amusingly, my initial state was wrong, which luckily triggered an assert I left in my code, quickly highlighting an issue.
- Somehow placed in the top 5% with just ABC???!
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