Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
8189	Circles On A Screen		81	28.40
8265	Zero Count		14	13.89
8282	Distance		51	25.88
8316	Win gold medal		55	27.37
8317	Red Balls		43	44.84
8320	Spreadsheet scrolling		75	32.63
8321	Chocolate distribution		115	24.51
8323	Triangle equality		58	43.85
8325	Partitioning the plane		37	39.49
8326	Leaky containers		31	41.84
8327	Progressive progressions		53	66.10
8328	Move the books		27	33.33
8331	Sister cities		36	52.75
8332	Ski slopes		24	21.90
8333	Place-name game		69	37.88
8334	Enumeration of rationals	2	85	17.06
8410	Snaky Numbers	1	81	39.68
8423	Recover Polynomials		51	48.25
8427	Permutation Game		32	41.05
8428	Grid Tiling		23	23.08
8429	Array Sorting		64	17.04
8461	Adventure in Moving		43	27.98
8478	Ancient Pocket Calculator		7	4.44
8546	Manoj and Pankaj		51	23.05
8593	Covering the Corral		8	31.58
8594	Tails all the way		287	34.27
8626	Show Me The Fax	1	105	41.99
8627	I2C		32	25.79
8628	Selling Land		70	46.89
8651	Alien arithmetic	1	40	18.81
8657	The Bovine Accordion and Banjo Orchestra		6	25.00
8661	Bogosort		42	14.33
8663	Squares Game		34	48.75
8732	Best Fit	1	191	30.32
8735	Suffix Of Cube	1	93	43.09
8759	Alpine Skiing	1	51	38.46
8795	Twenty Questions	1	40	20.65
8836	Yet Another Sequence Problem		73	23.62
8841	Avaricious Maryanna	1	76	37.46
8844	Detection of Extraterrestrial		118	36.36
8845	Entertainment	1	48	38.10	34
8846	Fudan Extracurricular Lives		7	25.00
8848	Herbicide		18	41.56
8849	Imitation		23	38.36
8945	Grid points (speed variation)		24	24.68
8951	brownie		62	48.75
8971	LQDNUMBERS		31	36.44
8992	A los saltos		36	30.82
9000	Bob and his new kite factory		2	1.44
9030	Bob and his towers		38	31.76