What went well
- I got A in 3 minutes.
- I wasn't sure how to prove B during the contest. Then I decided to binary search when a linear search would have run in time. However, I had a bug in my binary search because I needed to look at particular residues mod 4, which required extra debugging to get right. All this took…1.5 hours.
- I was completely wrong for C because I didn't realize that not all larger subarrays may work.
- Apparently I probably won't lose too much elo.
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