Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
9137	Pyramid Sums	94	35.16	34 17
9161	Legendre symbol	188	45.35	9 9
9190	Perfect Maze	31	1.73
9260	Perfect Road	12	14.65	17 17
9331	DCD	63	50.29	17 1
9378	Landfill	64	43.12
9382	Complan Carnival	37	34.25
9430	The game of 31	165	39.30	13 17
9434	New Horizons	11	31.75
9440	To Add or to Multiply	15	13.39
9445	Attack of the Clones	26	49.18
9446	Shortest Circuit Evaluation	29	34.94
9447	Genetics	42	35.46
9448	Swarm of Polygons	36	29.87
9489	Johny Hates Math	24	7.05
9506	Jimmy´s Travel Plan	17	39.69
9507	Mario and Mushrooms	345	56.96	1 34
9509	Shortest Path on a Cylinder	27	40.49
9511	24-Puzzle	23	17.33
9512	Bombing	89	23.42	17 17
9513	Game	18	21.11
9515	Dwarven Sniper´s Hunting	14	48.72
9516	XOR Equations	15	16.49
9517	Unlock the Cellphone	11	22.94
9527	Department	10	6.21	34 17
9528	Johns Trip	20	28.57
9534	Turn on the lights	69	32.37
9543	Dynamic Congruence Equation System	10	64.34	50 50
9636	A Canvas Building	67	18.36	17 17
9638	Circuits	24	8.96	50 34
9642	Getting There Fast	14	13.61
9645	Joy of CompuTenis	6	12.77
9686	Yummy Triangular Pizza	483	65.64	26 17
9689	Very Boring Homework	16	32.84
9690	Universal Question Answering System	23	24.06
9691	Triangles and Quadrangle	15	12.24
9692	Share the Cakes	8	8.41
9694	Quelling Blade	7	28.30
9723	Card Shuffling	39	25.91
9746	Bytelandian Tours	14	18.66
9749	Cliques	69	28.94
9750	Polygon Diagonals	26	27.91
9753	Tuple Division	17	4.00
9755	Grey Area	301	62.05
9817	Shortcut	54	25.94	17 17
9856	The Glazier	70	47.96
9857	Eight Directions Crossword	135	14.79
9862	Help the Airline Company	11	23.40
9890	Piece it together	95	24.14
9891	Please, go first	219	54.35	26 17