Hey there! I am testing some new stuff (according to your suggestions) and playing with matplotlib (learning it to be precise), so here is a bunch of statistics (only) in some past contest (Codeforces Round 269 (Div. 2)).

Previous posts can be found here.

Stats

By "rejected solutions" we understand solutions, which didn't pass the final tests (and were tested on them).

Tests describtion

In the following figures, we show which tests were used (for example, how many solutions during the contest had wrong anser on test number #14).

471A - MUH and Sticks

471B - MUH and Important Things

471C - MUH and House of Cards

471D - MUH and Cube Walls

471E - MUH and Lots and Lots of Segments

Fastest hackers

Best hackers

Best rooms

Best countries

Country	#hacks	Hackers
India	72	abhra73 [10], archie1993 [7], yellow1 [4], swap [3], Ikshu [3], pk. [3], thatDarkHorse [3], rituranjna [3], gvishal [3], win_ay39 [2], w00t [2], aditya_kakarot [2], sarveshmahajan [2], uSeemSurprised [2], shank_punk [2], nkrajesh [2], vector96 [2], kunalkukreja [2], achaitanyasai [1], silennbud [1], CurbStomp [1], bernett [1], avm12 [1], himank [1], rsunny [1], Balajiganapathi [1], shri3011994 [1], k_____k [1], venki421 [1], asdoc [1], m17 [1], p00r [1], kevi793 [1]
Egypt	43	mohamednabil00000 [7], ahmed_aly [7], Guts [5], Druid [5], Killever [5], Nada [3], khaledA [2], travellerX [1], Mohamed-Khaled [1], Mohamed.Bassem [1], Abdo_Sameh [1], Tensor [1], ahmed.rabie1234 [1], abdelkarim [1], AhmedMohsen [1], tare2Ashraf [1]
Russia	42	SC_pRo_ION [8], Eran [5], SlavaSSU [4], w0w [4], riadwaw [4], Misha100896 [3], ZharkovGK [3], DaniilPlyushchenko [2], maks1906 [2], SashaMN [1], ershov.stanislav [1], Dimp [1], AGrigorii [1], azukun [1], fanzil [1], TheRealRoman [1]
Kazakhstan	31	chrome [7], yasinkkaya [5], Roma [5], Elibay [2], _Madiyar [2], Xephy [2], amacxf362 [2], ErzhaNN [1], AmazingCoder [1], rustembek [1], zhabo [1], a_kabdygali [1], amiro [1]
China	25	randomstr [6], 12310720112 [5], SCUTE [4], jasison [2], kojimai [2], curs0r [2], toraoh [1], zjbztianya [1], bigmingod [1], preeminenth [1]
Bangladesh	19	ndatta [5], sahedsohel [3], uc-nuts [3], emotionles [3], rumman_sust [3], ho-jo-bo-ro-lo [2]
Ukraine	13	speedermen [5], Maxim [3], DJiGIT [2], chakred_namor [1], Metamorphus [1], MrDindows [1]
Belarus	11	Scrat [5], Wintersm1th [3], I_love_Varechka [2], vkozlovs [1]
Poland	8	NoEmotions [5], Marcin_smu [2], Swistakk [1]