NOIP '21 Mirror

This is an unofficial mirror (with unofficial test cases) of NOIP (Chinese National Olympiad in Informatics Provincial Round, approximately equivalent to CCC Stage 1) '21.

There are 4 problems, each worth 100 points, for 3 hours, with full feedback (actual NOIP is 3.5 hours, but without feedback).

This contest will not be rated.

We will upload more mirrors on the next few Mondays to prepare for the USACO from Dec 18 to 21. Discord for anyone who wants post/pre contest discussion: https://discord.gg/5YEXQdnq


Problems

Problem Points AC Rate Users
NOIP '21 P1 - Saying Numbers 10p 27.5% 50
NOIP '21 P2 - Sequence 20p 31.9% 26
NOIP '21 P3 - Variance 20p 8.0% 10
NOIP '21 P4 - Chess 20p 16.3% 5

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