Welcome in Bayan 2015 Contest Warm Up hacks description. This round was pretty good for hackers, but again there were nearly two times more unused opportunities for hack than the used ones. Let's look at them.

If you want to share your hack (or mistake) -- we're waiting for your comments.

Previous posts can be found here.

Stats

Hacks and possible hacks describtion

475A - Bayan Bus

The task was pretty simple, the solution could be, so why there were so many fails? In the graph below we can see that test #5 was quite bad. What was that? Simple 0. Many hacks was simply the numbers lower than 3. Why so many people failed on this? They forgot about the middle place, instead of this:

+------------------------+
|#.#.#.#.#.#.#.#.#.#.#.|D|)
|#.#.#.#.#.#.#.#.#.#.#.|.|
|#.......................|
|#.#.#.#.#.#.#.#.#.#.#.|.|)
+------------------------+

they were printing this:

+------------------------+
|#.#.#.#.#.#.#.#.#.#.#.|D|)
|#.#.#.#.#.#.#.#.#.#.#.|.|
|........................|
|#.#.#.#.#.#.#.#.#.#.#.|.|)
+------------------------+

475B - Strongly Connected City

There are two types of killer tests:

2 2
<>
^v

and

20 20
anything
anything

The pretests weren't really big, so the second test was killing slow solutions or the one with bad memory allocation.

Solutions which was failing the first test were checking mostly if the first and last character in each line were equal, if yes -- then the answer was NO, if no -- then YES. Pretty bad, wasn't it?

475C - Kamal-ol-molk's Painting

There were only 6 successful hacks and nearly all of them were really big tests, which were giving TLE, so unfortunately there is nothing special to talk about here.

475D - CGCDSSQ

475E - Strongly Connected City 2

475F - Meta-universe

Fastest hackers

Best hackers

Best rooms

Best countries

Country	#hacks	Hackers
China	35	wyxourlove [4], Bobgy [3], Dwayne [3], CA72 [2], mwc123 [2], Starzxy [2], Napoleon_cn [2], kuangbin [1], wust_youji [1], Spark001 [1], yanaz [1], HaibaraAi [1], RoundDog [1], CHEATBEATER [1], zhu081607 [1], Silence_Walker [1], JimmyCHW [1], JOHNKRAM [1], greatwall1995 [1], last_one [1], liympanda [1], shigule [1], mstczuo [1], lxw [1]
Russia	34	Gassa [7], gridnevvvit [4], DimaPhil [3], PavelKunyavskiy [2], Petruchcho [2], Sehnsucht [2], HellKitsune [2], ifsmirnov [1], Dmitry_Egorov [1], redoak [1], dzhenakov [1], Misha100896 [1], knst [1], Zool [1], SC_pRo_ION [1], ItsLastDay [1], el_sanchez [1], SlavaSSU [1], savinov [1]
India	26	namdev102 [5], phantom11 [5], shank_punk [3], harrypotter192 [3], kuldeepfouzdar [2], yellow1 [2], StoneCold_ [2], gorv [1], MoritakaMashiro [1], noah07 [1], rishabh.nsit [1]
Bangladesh	24	ho-jo-bo-ro-lo [8], ndatta [3], sahedsohel [3], FlaminRage [3], bhadra [2], ShockProof [1], nfssdq [1], prophet_ov_darkness [1], the_redback [1], MKGAURAB [1]
Ukraine	22	EG0R [5], Programist [4], sdya [2], adamant [2], aangairbender [2], Stratonov [2], Fdg [1], BigBag [1], RomaWhite [1], fiter [1], T0RRES [1]
Iran	21	mhadih [3], PAP [3], Reza_H [2], somag [2], MamZi [2], Kianoosh [1], ArtinTD [1], Fazel [1], BENYAM1N [1], poopi [1], Amirkasra [1], IMAN_GH [1], SAKT [1], NADAF [1]