Codeforces and Polygon may be unavailable between
Aug. 17, 19:00 (UTC)
Aug. 17, 22:00 (UTC)
due to planned power outages.
Professional way to prepare programming contest problems
Attach session to IP address (more secure)
Polygon 0.2-r2040 (c) Copyright 2009-2022 Mike Mirzayanov
Platform for creating programming competition problems
Judging on: Intel(R) Core(TM) i3-8100 CPU @ 3.60GHz
Execution time: 1 ms.