Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
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	1521	28.03	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	179	28.96	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	841	16.26	20 15
3591	Patting Heads	3	638	35.07	17 17
3605	Minimum Rotations	14	906	19.02	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	2090	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	2.60
3678	Cattle Bruisers		86	25.65
3679	Moo University - Emergency Pizza Order	-1	35	26.42
3693	Maximum Sum	57	6382	42.08	19 18
3713	Primitive Root	6	592	30.41	15 27
3723	Snooker	4	442	50.00	12 30
3724	Rainbow Ride	8	477	36.12	19 19
3725	Taming a T-REX	1	145	44.58	34
3732	Slikar	1	207	51.61	28 17
3733	Trezor		99	52.26
3734	Periodni	2	511	34.81	26 34
3749	Subset Sums	73	4008	26.28	17 20
3752	JEDNAKOST	12	595	18.40	23 21
3753	GONDOR	4	378	52.82	13 13
3754	MAJMUN	1	72	44.29	17 17
3762	Bread Tree		161	13.50
3763	George	15	520	52.54	19 18
3791	Street	7	662	51.56	9 12
3831	Lubenica	1	199	42.28	17 17
3832	Kruska	4	104	45.79	17 17
3833	Tresnja	1	126	52.36	42 42
3861	Laser Phones	30	1355	28.59	20 18
3863	Area of circles	1	301	29.55	34 34