Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
707	Triple-Free Sets	1	161	40.60	34 34
733	Mountain Walking	1	748	25.32	34 26
861	Counting inversions	6	458	20.04	34 28
872	Mark-up		119	29.50	34 17
898	Transmitters	2	273	48.37	34 26
912	Submatrix of submatrix	1	166	26.18	34 17
1110	Sudoku	4	429	38.17	34 1
1448	3D Cover	3	91	26.87	34 26
1457	Help Blue Mary Please! (Act I)		13	1.75	34 17
1475	Play with Digit Seven	3	121	36.53	34 14
1552	Mobiles		183	27.63	34 34
1644	Trees	1	35	14.66	34 34
1687	Logic II	1	24	12.50	34 34
1712	Permalex	-1	168	19.49	34 34
1741	Tetris 3D	1	157	32.40	34 50
1776	DNA Laboratory	3	107	11.13	34 23
1797	Cardsharper	2	7	29.73	34 45
1833	Sudoku	1	48	32.02	34 34
1869	Making Mountains Out Of Molehills	1	14	15.93	34 17
1873	Accumulate Cargo	2	87	26.25	34 9
1878	Farmers Cattle	1	57	37.62	34 34
1879	Game Time	1	101	22.59	34 34
1960	Rectangles	3	163	16.39	34 28
1991	Another Continuous Fractions Problem	1	82	19.89	34 17
2147	Root of a Linear Equation		58	8.39	34 17
2152	Hilbert Curve	1	13	16.29	34 34
2172	Ballroom Lights	1	33	33.75	34 17
2176	Finding Seats	2	220	14.87	34 34
2189	Making Pairs	1	44	16.21	34 42
2276	Partitions	1	19	10.80	34 34
2324	Mario	1	59	13.68	34 34
2415	Kirchhof Law	1	90	19.13	34 17
2420	Hospital at Hands		25	23.08	34 34
2565	Another Permutation Problem	1	56	24.15	34 17
2648	Archiver	1	44	13.46	34 50
2829	Time Limit Exceeded	3	244	21.00	34 34
2882	The Warehouse	1	24	28.46	34 17
3003	Median Filter	2	20	47.58	34 34
3004	Life Game	-1	69	33.94	34 1
3070	How many subsequences	1	94	9.74	34 34
3310	Serial Numbers	1	32	29.06	34 17
3382	Monster Trap	1	27	22.44	34 17
3390	Tribe Council	1	57	22.07	34 34
3414	Bora Bora		144	48.65	34 26
3464	Clock	3	47	35.23	34 9
3578	Hashing	1	39	11.76	34 34
3581	Tree Similarity	1	25	49.17	34 34
3863	Area of circles	1	300	29.53	34 34
3889	Closest Number	1	191	30.03	34 26
3896	Maximal Independent Set	2	58	25.20	34 42

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