10 January 2020

Codeforces Round #613 (Div. 2) Postmortem

Link to contest here

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.
What went wrong
  • B took ~50 minutes and two wrong submissions.
Where I got lucky
  • 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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