Screencast and editorial of Round #857
source link: https://codeforces.com/blog/entry/113706
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Today I screencast and explained solutions of problems A–D and F. The video is uploaded to YouTube: https://youtu.be/B48ykX0NpUY
I have to inform that the round quality wasn't exceptionally high: the translation was noticeably Google translated from Russian (for example, представление has at least two meanings — representation or performance, and Google Translate wasn't able to discriminate between these two), the pretests were weak in B, C and F (many people were simply TL-hacked or had their solution fail during system testing). I will elaborate on problem F: there I wrote a square root decomposition with incorrect constants, but still got AC though my solution was incorrect on these simple tests:
2 3
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5 5 5 5Nevertheless I knew what to expect (I call such rounds contests for schoolchildren) and overall experience was satisfactory.
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