Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
8062	Shopping Rush		73	63.26
8097	Islands		73	46.82
8104	Friendly Knights		151	45.76
8108	POLYU		36	26.76
8189	Circles On A Screen		83	28.67
8282	Distance		52	23.74
8316	Win gold medal		55	26.03
8317	Red Balls		47	44.77
8320	Spreadsheet scrolling		78	29.61
8321	Chocolate distribution		116	23.97
8323	Triangle equality		60	35.34
8325	Partitioning the plane		42	42.17
8326	Leaky containers		34	43.12
8327	Progressive progressions		57	60.29
8328	Move the books		27	24.19
8331	Sister cities		39	50.00
8332	Ski slopes		29	22.58
8333	Place-name game		75	36.34
8334	Enumeration of rationals	2	92	17.28
8423	Recover Polynomials		58	49.68
8427	Permutation Game		34	40.38
8428	Grid Tiling		25	23.49
8429	Array Sorting		67	17.23
8478	Ancient Pocket Calculator		7	4.25
8546	Manoj and Pankaj		51	18.32
8593	Covering the Corral		12	36.96
8594	Tails all the way		293	34.63
8626	Show Me The Fax	1	111	43.20
8627	I2C		35	24.85
8628	Selling Land		73	47.78
8651	Alien arithmetic	1	45	18.37
8657	The Bovine Accordion and Banjo Orchestra		8	22.81
8661	Bogosort		46	15.27
8663	Squares Game		34	33.05
8732	Best Fit	1	196	30.84
8735	Suffix Of Cube	1	102	43.91
8759	Alpine Skiing	1	54	38.37
8795	Twenty Questions	1	44	21.94
8836	Yet Another Sequence Problem		78	23.49
8841	Avaricious Maryanna	1	77	37.90
8844	Detection of Extraterrestrial		126	36.51
8845	Entertainment	1	52	39.11	34
8846	Fudan Extracurricular Lives		7	25.00
8848	Herbicide		19	18.87
8849	Imitation		28	24.82
8945	Grid points (speed variation)		31	24.38
8951	brownie		73	49.17
8971	LQDNUMBERS		36	35.04
8992	A los saltos		39	29.81
9000	Bob and his new kite factory		2	1.09