Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
9690	Universal Question Answering System	24	25.14
9691	Triangles and Quadrangle	14	12.32
9692	Share the Cakes	7	10.53
9694	Quelling Blade	5	33.33
9723	Card Shuffling	39	26.69
9746	Bytelandian Tours	15	24.32
9749	Cliques	66	27.80
9750	Polygon Diagonals	26	29.13
9753	Tuple Division	17	4.10
9755	Grey Area	293	61.51
9817	Shortcut	53	26.61	17 17
9856	The Glazier	64	46.83
9857	Eight Directions Crossword	134	15.11
9862	Help the Airline Company	11	23.91
9890	Piece it together	94	24.01
9891	Please, go first	212	53.76	26 17
9893	Smoking gun	40	27.98
9895	Tracking RFIDs	52	31.94
9896	Train delays	44	25.40
9936	Construct the Great Wall	9	41.67
9940	Fruit Ninja	39	26.73
9944	Ji-Tu Problem	14	12.50
9950	IQ Team	37	41.59	50 50
9968	Magic Crystals and Laser Beams	179	23.48
9970	The Egyptian Parliament	49	18.84
9971	Adventurous Chess Masters	19	23.15
9974	Men From Mars	22	39.66
10071	Working at the Restaurant	32	37.78
10074	Genetics	9	33.33
10076	Slalom	30	34.44
10077	Routing	15	38.64
10081	Periodic Points	12	40.00
10082	Comparing Answers	57	12.59
10084	Fake Scoreboard	23	45.21
10086	Jumping Monkey	54	24.87
10087	Sensor Network	23	21.85
10088	Assembly Line	34	40.43
10091	Three-sided Dice	27	21.48
10092	Party Night	28	41.89
10095	Caper Pizza	27	27.56
10096	Lights (Extreme)	55	30.25	17 17
10105	Alphabet Soup	28	50.00
10106	Coin Collecting	41	39.57
10109	Game, Set and Match	94	66.86
10110	Guess the Numbers	123	44.21	17 17
10112	Peer Review	116	32.71
10113	Regular Convex Polygon	95	29.50
10141	STRAZA	45	46.51	34 17
10230	Robbing Gringotts	53	10.96
10242	Dice on a Board	17	30.00