Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
9137	Pyramid Sums	94	35.07	34 17
9161	Legendre symbol	189	45.41	9 9
9190	Perfect Maze	31	1.73
9260	Perfect Road	14	16.56	17 17
9331	DCD	63	50.29	17 1
9378	Landfill	66	43.30
9382	Complan Carnival	39	33.77
9430	The game of 31	165	39.30	13 17
9434	New Horizons	11	31.75
9440	To Add or to Multiply	17	15.13
9445	Attack of the Clones	28	50.79
9446	Shortest Circuit Evaluation	29	34.94
9447	Genetics	46	33.13
9448	Swarm of Polygons	38	30.77
9489	Johny Hates Math	25	6.90
9506	Jimmy´s Travel Plan	22	40.44
9507	Mario and Mushrooms	345	56.96	1 34
9509	Shortest Path on a Cylinder	27	31.15
9511	24-Puzzle	23	17.33
9512	Bombing	89	23.42	17 17
9513	Game	20	18.58
9515	Dwarven Sniper´s Hunting	17	38.33
9516	XOR Equations	16	16.83
9517	Unlock the Cellphone	11	22.94
9527	Department	11	7.73	34 17
9528	Johns Trip	20	28.57
9534	Turn on the lights	69	32.37
9543	Dynamic Congruence Equation System	10	63.36	50 50
9636	A Canvas Building	70	17.93	17 17
9638	Circuits	23	8.61	50 34
9642	Getting There Fast	18	17.12
9645	Joy of CompuTenis	6	10.71
9686	Yummy Triangular Pizza	484	65.69	26 17
9689	Very Boring Homework	16	32.84
9690	Universal Question Answering System	25	24.35
9691	Triangles and Quadrangle	14	11.56
9692	Share the Cakes	9	8.55
9694	Quelling Blade	9	30.36
9723	Card Shuffling	40	25.99
9746	Bytelandian Tours	14	17.12
9749	Cliques	69	28.94
9750	Polygon Diagonals	27	27.35
9753	Tuple Division	17	4.01
9755	Grey Area	301	62.05
9817	Shortcut	54	25.94	17 17
9856	The Glazier	71	47.77
9857	Eight Directions Crossword	137	14.94
9862	Help the Airline Company	14	26.42
9890	Piece it together	95	24.14
9891	Please, go first	219	54.35	26 17