Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
9447	Genetics	41	35.29
9448	Swarm of Polygons	36	35.59
9489	Johny Hates Math	21	16.92
9506	Jimmy´s Travel Plan	17	40.00
9507	Mario and Mushrooms	340	56.76	1 34
9508	Magic Bitwise AND Operation	104	12.72
9509	Shortest Path on a Cylinder	11	28.78
9510	Ads Proposal	63	24.94
9511	24-Puzzle	23	23.14
9512	Bombing	83	22.69	17 17
9513	Game	18	32.73
9515	Dwarven Sniper´s Hunting	11	60.00
9516	XOR Equations	14	18.07
9517	Unlock the Cellphone	11	26.88
9527	Department	7	5.15	34 17
9528	Johns Trip	14	27.87
9534	Turn on the lights	64	32.57
9543	Dynamic Congruence Equation System	9	51.16	50 50
9636	A Canvas Building	65	18.95	17 17
9638	Circuits	25	9.82	50 34
9642	Getting There Fast	14	14.49
9645	Joy of CompuTenis	6	17.65
9686	Yummy Triangular Pizza	467	65.91	26 17
9689	Very Boring Homework	15	33.33
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