Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
3693	Maximum Sum	57	6404	42.11	19 18
3679	Moo University - Emergency Pizza Order	-1	35	26.42
3678	Cattle Bruisers		86	25.65
3647	Moebius		1	2.60
3646	Adventure Tourism		44	17.28
3645	Farthest Headquarters		55	25.80
3644	Winning Strategy	1	35	38.98	17 50
3643	Traffic Network	89	2092	18.30	18 21
3642	Pretty Printing		39	24.38
3641	Earthquakes		23	37.68
3640	Hanoi Subway System Construction		32	41.75
3639	Lucky Numbers	7	729	34.11	13 9
3638	Word Counting	7	2624	21.05	10 6
3605	Minimum Rotations	14	906	19.02	14 20
3591	Patting Heads	3	638	35.07	17 17
3587	Prime Again	11	841	16.26	20 15
3582	Restaurant Tab		24	27.27
3581	Tree Similarity	1	25	49.17	34 34
3579	Disjoint Paths	4	311	20.63	24 27
3578	Hashing	1	39	11.76	34 34
3577	Parity	3	77	19.52	17 34
3576	Boy Scouts	3	142	28.57	21 30
3565	Choosing Gloves	3	84	22.88	17 34
3545	Najkraci	6	179	28.96	28 34
3544	Binary Search Tree	6	587	20.63	11 20
3543	Matrica		53	39.38
3533	Game on board		28	36.73
3505	Prime Number Theorem	25	1521	28.03	14 13
3495	The Nobel Thief		6	38.10
3492	Braille Transcription	-1	10	12.32
3490	Hidden Triangle		9	28.85
3488	The Top-Code	1	55	20.32	17 34
3486	Elimination		67	28.57
3485	Disputes		80	62.59
3484	Crossbits	3	97	14.78	23 15
3483	Begin		4	11.11
3482	Alias		4	57.14
3477	Baby	27	941	46.44	20 23
3476	Deposit	2	232	39.00	17 21
3466	Another Longest Common Subsequence Problem		6	42.86
3465	Drive through MegaCity		23	25.16
3464	Clock	3	47	35.23	34 9
3463	Robintron		6	22.22
3462	The Skatepark´s New Ramps		10	32.65
3461	Song Contest		12	14.44
3459	SkyScrapers	2	349	38.68	17 17
3442	The last digit	188	29384	26.92	9 8
3436	Histogram	44	1491	44.59	19 22
3426	Ouroboros Snake	2	81	52.59	26 34
3420	Falling Ice		7	24.14