Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
7387	Airplane Parking	53	22.88
7389	Rating Hazard	21	21.10
7402	Repair Depots	14	46.34
7409	Drawing Quadrilaterals	51	12.12
7427	Jara’s Legacy	81	39.79
7490	Biology	13	5.80
7556	B - Stock Charts	39	39.64
7558	D - Alphabetomials	10	50.00
7559	E - Football Team	9	19.70
7560	F - Interesting Ranges	9	25.00
7563	Hi6	37	17.90	26 26
7566	Expected Cycle Sums	44	46.40
7579	Power Calculus	271	45.72	34 17
7581	The Best Name for Your Baby	10	34.38
7589	Cave Crisis	11	65.22
7599	Optimal Strategy for the ICPC	8	18.37
7627	Driving Direction	10	43.75
7629	Building Ports	43	13.48
7630	SHOPPERS	148	34.95
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	65.56
7772	Help a researcher	55	46.99
7777	National Treasure	32	38.30
7779	Stock Chase	71	29.63	17 17
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	22.30
7884	Crni	54	54.13
7886	Boards (Hard)	35	34.59
7891	Fibonacci Sequence	97	30.21	34 34
7960	Multiplicative Palindrome	31	31.55
7972	World of cubes	33	16.00
8055	Playground	276	25.75
8062	Shopping Rush	71	63.59
8097	Islands	70	46.63
8099	Crash´s number table	145	22.48
8104	Friendly Knights	147	45.38
8108	POLYU	32	27.65
8189	Circles On A Screen	81	28.40