Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
4166	Four colors	1	100	21.88	50 50
4168	Square-free integers	12	603	43.73	13 19
4172	Multiplicative digital root	1	72	25.25
4176	A Knightly Pursuit	2	63	27.56	26 17
4177	Herding	56	2696	35.18	14 15
4179	Temptation Island	2	648	44.85	20 12
4180	Pizza Location	2	571	18.49	31 17
4182	Candy (Again)	2	225	18.50	34 34
4186	Break a New RSA system	1	137	35.76
4188	Amazing equality		38	13.58
4189	Landing		4	3.64
4198	Lego	5	173	25.31	24 22
4206	Fast Maximum Matching	29	1948	29.17	22 19
4309	Circular game		32	19.89
4421	Irreducible polynomials over GF2		62	18.01
4452	Simple Arithmetics II	55	7442	42.38	11 5
4458	Rainbow	1	34	19.46	17 34
4461	A Famous Airport Manager		23	16.36
4487	Can you answer these queries VI	25	1211	22.72	34 28
4523	Binomial Coefficients		209	41.72	23 12
4525	Digger Octaves	6	369	35.58	17 21
4528	Frog Wrestling		66	43.23
4761	Strategy game	2	37	54.10	9 17
4784	Diophantine equation	2	149	39.96	17 1
4828	ZSequence		51	19.33
5093	Pretty Functions	1	37	23.67
5120	Minimal Possible String	3	55	5.08	34 28
5157	Game Simulator	1	17	4.57	50 17
5163	Tower of Vientiane		92	40.20
5182	Double Sorting		12	8.92
5446	Fishing Net		147	31.37
5449	Seinfeld	188	9502	40.07	8 11
5453	Air Strike	2	175	23.63	17 17
5511	Heavy Sequences		79	18.00	34 34
5541	Sequoiadendron	1	61	43.89	17 17
5609	Knight Moves	6	98	40.36	9 20
5649	Divide Polygon	3	31	21.43	9 34
5911	Square-free Integers Factorization	1	20	39.51	17 34
5917	Factorial length	11	3462	34.54	5 17
5970	Finding Primes	22	1326	27.86	16 15
5971	LCM Sum	80	3516	25.73	20 29
5973	Selecting Teams		222	22.69
6169	Standing Sequence	2	118	28.49	34 39
6170	Homecoming		17	23.00
6171	Majority	35	5307	43.13	6 7
6172	OAE	6	1150	41.72	11 27
6221	Increasing Powers of K	4	350	27.39	24 34
6230	Dictionary order		5	10.64
6236	Matches	8	449	21.93	26 7
6256	Inversion Count	528	16704	31.56	16 18

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