Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
1881	Instruction Decoder	2	667	50.76	17 17
1965	Set Cover	2	25	11.62	1 17
2000	Boxes (Hard)	2	17	3.07	26 34
2038	Rectangle Tiling	2	114	40.84	1 1
2055	Weird Numbers	2	344	35.90	17 17
2125	Number Labyrinth	2	65	25.79	17 17
2136	Candy II	2	611	45.87	17 17
2176	Finding Seats	2	222	14.88	34 34
2321	Segments	2	152	14.28	17 34
2322	Tree Game	2	324	43.31	26 42
2415	Kirchhof Law	2	102	21.16	17 17
2422	Jazzy Job	2	65	33.20	9 17
2878	Knights of the Round Table	2	517	21.90	9 17
2883	Widget Factory	2	156	34.18	26 26
2885	Word Rings	2	383	15.27	17 34
2961	Triomino Game	2	237	28.49	26 42
3003	Median Filter	2	21	48.03	34 34
3249	Typesettin	2	35	46.07	1 1
3308	The Bridges of San Mochti	2	68	56.06	17 17
3322	Doubled Numbers	2	166	48.82	17 17
3362	Setnja	2	245	21.33	9 17
3409	Electricity	2	809	47.65	5 1
3411	Pole Position	2	917	47.41	8 8
3413	Traveling Shoemaker Problem	2	74	17.01	28 17
3426	Ouroboros Snake	2	82	52.12	26 34
3476	Deposit	2	234	38.24	17 21
3734	Periodni	2	625	37.88	26 34
3896	Maximal Independent Set	2	60	24.81	34 42
3897	Convex Polygons	2	120	30.43	17 34
3909	CALCULATE POW(2004,X) MOD 29	2	275	56.52	1 17
3931	Maximum Triangle Area	2	283	29.27	5 28
3962	ELEVATOR II	2	99	43.12	9 26
4035	NERED	2	394	57.72	9 13
4063	Sell Pigs	2	461	51.30	26 42
4155	OTOCI	2	502	45.61	26 34
4166	Four colors	2	102	21.82	42 42
4176	A Knightly Pursuit	2	65	28.25	26 17
4179	Temptation Island	2	651	44.96	20 12
4180	Pizza Location	2	574	18.53	31 17
4182	Candy (Again)	2	230	18.64	34 34
4390	Cards shuffing	2	121	26.90	26 21
4429	Spelling Lists	2	189	32.05	17 34
4456	Jumbo Airlines	2	74	38.58	34 34
4458	Rainbow	2	36	19.39	34 42
4491	Primes in GCD Table	2	796	35.79	17 26
4532	String reduction	2	166	16.56	17 30
4546	Tobo or not Tobo	2	265	19.52	26 26
4555	Einbahnstrasse	2	488	26.52	22 9
4761	Strategy game	2	43	55.73	9 17
4871	Bridge	2	159	24.16	1 34

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