Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
1880	Hanoi Calls		205	54.44
1881	Instruction Decoder	2	668	50.81	17 17
1960	Rectangles	4	173	16.61	34 28
1961	Roman Roads	1	103	31.59	9 17
1962	Circles		62	20.12
1963	Image Projections		109	34.26
1964	Tree cut		149	38.10
1965	Set Cover	2	25	10.92	1 17
1966	Ski Valley		117	18.43
2002	Random Number Generator		98	40.62
2019	The Rolling Ball		4	5.48
2022	Truth Or Lie		104	21.17
2023	One Instruction Computer Simulator		47	10.58	42 42
2031	Please help You-Know-Who		39	28.65
2038	Rectangle Tiling	2	116	41.61	1 1
2047	Stone Removing Game	-1	133	37.96
2050	Strange Billboard	10	805	60.55	13 29
2051	Cell Phone	4	161	31.43	28 36
2052	Hexagonal Parcels		76	28.93
2053	Key Task	37	1188	31.78	24 22
2054	Gates of Logic	1	37	22.91	17 17
2055	Weird Numbers	2	346	35.99	17 17
2056	Rectangular Polygon	1	136	48.14	1 17
2058	Reaux! Sham! Beaux!	4	664	32.90	23 6
2059	Robotic Sort	5	740	33.19	28 26
2060	Tough Water Level		36	18.21
2171	Ambiguous Codes	1	85	39.47
2172	Ballroom Lights	1	35	32.94	34 17
2173	Car Plates Competition	1	261	42.05	17 17
2174	Drop the Triples	5	122	29.04	21 24
2175	Emoticons	3	332	22.00	23 28
2176	Finding Seats	2	224	15.00	34 34
2177	Galou is back!	-1	226	31.01
2178	He is offside!	5	8447	50.13	3 4
2179	ICPC Scoreboard	1	180	29.76	17 17
2180	Justice League		83	48.97
2317	Bracket Sequence	1	57	23.73	26 34
2318	Overlapping Words		90	22.40
2319	Sequence		218	28.12
2320	Manhattan	9	705	32.41	20 34
2321	Segments	2	156	13.91	17 34
2322	Tree Game	2	325	43.37	26 42
2323	Broken Compass		47	13.78
2324	Mario	1	63	14.00	34 34
2325	String Distance		214	21.51
2371	Another Longest Increasing Subsequence Problem	18	844	13.68	30 33
2412	Arranging Amplifiers	18	3283	27.22	7 16
2413	Building Beacons		42	19.84
2414	Calculate The Cost	8	343	22.37	28 17
2416	Distinct Subsequences	94	3783	36.34	12 22

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