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MSDN

1+3+5+...+(2n-1)=n*n

Rank by solved	641 out of 166660
Problems solved	341 out of 1198
Rank by rating	599 out of 166660
Rating	130876 out of 1717913

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Neighbours

Rank	Author	Rating	Solved	Last AC
638	[PSTU] Vadick	99414	342	16 Oct 2015 18:10
639	\guiwnv`~	65990	342	3 Jan 2019 19:55
640	pivasik	65484	342	10 Dec 2020 19:02
641	MSDN	130876	341	18 Nov 2010 15:21
642	Михаил	69259	341	28 Jun 2024 16:41
643	flower	265489	340	18 Aug 2008 13:02
644	ScennyMao	157770	340	20 Oct 2012 17:20