What went well
- I found a most elegant solution to B: much more elegant than the editorial.
- I figured out D, a bits (bitmasks?) problem! I think I'm really weak at bits and xors.
- B took ~50 minutes and two wrong submissions.
- I had to think a little for A to prove correctness, but end-to-end latency still only took 3 minutes.
- I submitted C without proving correctness and got it right??! Lucky me!
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