Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
3414	Bora Bora		144	48.65	34 26
3415	Shrinking Polygons		230	18.87
3420	Falling Ice		7	24.14
3426	Ouroboros Snake	2	81	52.59	26 34
3436	Histogram	43	1487	44.57	19 22
3442	The last digit	188	29258	26.95	9 8
3459	SkyScrapers	2	348	38.68	17 17
3461	Song Contest		12	14.44
3462	The Skatepark´s New Ramps		10	32.65
3463	Robintron		6	22.22
3464	Clock	3	47	35.23	34 9
3465	Drive through MegaCity		23	25.16
3466	Another Longest Common Subsequence Problem		6	42.86
3476	Deposit	2	232	39.00	17 21
3477	Baby	27	941	46.44	20 23
3482	Alias		4	57.14
3483	Begin		4	11.11
3484	Crossbits	3	97	14.78	23 15
3485	Disputes		80	62.59
3486	Elimination		67	28.57
3488	The Top-Code	1	55	20.32	17 34
3490	Hidden Triangle		9	28.85
3492	Braille Transcription	-1	10	12.32
3495	The Nobel Thief		6	38.10
3505	Prime Number Theorem	25	1520	28.02	14 13
3533	Game on board		28	36.73
3543	Matrica		53	39.38
3544	Binary Search Tree	6	587	20.63	11 20
3545	Najkraci	6	178	29.04	28 34
3565	Choosing Gloves	3	84	22.88	17 34
3576	Boy Scouts	3	142	28.57	21 30
3577	Parity	3	77	19.52	17 34
3578	Hashing	1	39	11.76	34 34
3579	Disjoint Paths	4	311	20.67	24 27
3581	Tree Similarity	1	25	49.17	34 34
3582	Restaurant Tab		24	27.27
3587	Prime Again	11	839	16.25	20 15
3591	Patting Heads	3	637	35.08	17 17
3605	Minimum Rotations	14	904	19.01	14 20
3638	Word Counting	7	2620	21.04	10 6
3639	Lucky Numbers	7	729	34.11	13 9
3640	Hanoi Subway System Construction		32	41.75
3641	Earthquakes		23	37.68
3642	Pretty Printing		39	24.38
3643	Traffic Network	89	2088	18.30	18 21
3644	Winning Strategy	1	35	38.98	17 50
3645	Farthest Headquarters		55	25.80
3646	Adventure Tourism		44	17.28
3647	Moebius		1	2.67
3678	Cattle Bruisers		86	25.65