Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
3749	Subset Sums	74	4224	26.66	17 20
3734	Periodni	2	662	38.96	26 34
3733	Trezor		105	52.34
3732	Slikar	1	213	52.05	28 17
3725	Taming a T-REX	1	151	44.34	34
3724	Rainbow Ride	9	497	36.16	19 19
3723	Snooker	5	459	50.51	9 27
3713	Primitive Root	6	614	30.62	15 27
3693	Maximum Sum	59	6621	42.45	19 18
3679	Moo University - Emergency Pizza Order	-1	37	27.40
3678	Cattle Bruisers		91	26.33
3647	Moebius		2	2.36
3646	Adventure Tourism		46	14.43
3645	Farthest Headquarters		60	26.80
3644	Winning Strategy	1	35	18.40	17 50
3643	Traffic Network	89	2120	18.30	18 21
3642	Pretty Printing		40	22.01
3641	Earthquakes		26	36.14
3640	Hanoi Subway System Construction		36	40.78
3639	Lucky Numbers	7	733	34.15	13 9
3638	Word Counting	7	2643	21.08	10 6
3605	Minimum Rotations	15	921	19.12	15 21
3591	Patting Heads	3	659	35.33	17 17
3587	Prime Again	11	879	16.45	20 15
3582	Restaurant Tab		24	21.90
3581	Tree Similarity	1	26	37.66	34 34
3579	Disjoint Paths	4	318	20.79	24 27
3578	Hashing	1	43	12.06	34 34
3577	Parity	3	83	19.98	17 34
3576	Boy Scouts	3	145	28.31	21 30
3565	Choosing Gloves	3	89	23.25	17 34
3545	Najkraci	6	188	28.92	28 34
3544	Binary Search Tree	6	611	21.01	11 20
3543	Matrica		56	39.90
3533	Game on board		26	31.14
3505	Prime Number Theorem	25	1538	28.13	14 13
3495	The Nobel Thief		14	51.52
3492	Braille Transcription		16	14.16	17 17
3490	Hidden Triangle		12	26.87
3488	The Top-Code	1	60	21.73	17 34
3486	Elimination		75	30.31
3485	Disputes	1	86	63.75
3484	Crossbits	3	99	15.25	23 15
3483	Begin		4	7.94
3482	Alias		7	31.82
3477	Baby	28	955	46.67	21 24
3476	Deposit	2	235	38.24	17 21
3466	Another Longest Common Subsequence Problem		6	5.66
3465	Drive through MegaCity		24	20.97
3464	Clock	3	66	36.47	34 9