Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
7632	Architecture	18	22.92
7666	Telecommunications	22	24.75
7680	Electrical Engineering	16	34.64
7692	Chemistry	69	13.87
7693	Environmental Engineering	11	23.95
7737	Escape	54	33.70
7740	Fence	19	29.23
7745	Bingo!	749	38.70	17 1
7746	Cocircular Points	59	16.57	42 17
7758	Growing Strings	172	31.78
7763	Ingenious Metro	66	66.67
7772	Help a researcher	55	46.99
7777	National Treasure	32	38.30
7779	Stock Chase	71	29.71
7783	Commuting Functions	44	25.22
7807	The Lucky Prisoner	27	9.93
7857	Tower Game (Hard)	59	15.07	34 34
7862	Prisoner of Benda	23	34.25
7874	Calculator	25	22.60
7884	Crni	52	53.27
7886	Boards (Hard)	35	34.59
7891	Fibonacci Sequence	97	30.21	34 34
7960	Multiplicative Palindrome	31	31.55
7972	World of cubes	34	17.42
8055	Playground	276	25.75
8062	Shopping Rush	71	63.59
8074	God of Number Theory	25	41.98
8097	Islands	69	46.30
8099	Crash´s number table	99	20.07
8104	Friendly Knights	147	45.38
8108	POLYU	32	27.65
8189	Circles On A Screen	81	28.40
8265	Zero Count	14	13.89
8282	Distance	51	25.88
8286	Perfect Matching	90	18.98	1 17
8316	Win gold medal	55	27.37
8317	Red Balls	43	44.84
8318	color the balls	66	45.93	50 50
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
8421	Fun With Inequalities	140	38.05	17 17
8423	Recover Polynomials	51	48.25