Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
2154	Kruskal		85	14.03
2157	Anti-Blot System	104	12967	45.24	10 5
2159	Delicious Cake		30	14.64
2160	Here-There		30	24.76
2161	Pixel Shuffle		34	21.03	50 17
2162	Towers of Powers		26	13.87
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	22.01	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
2185	Musical Optimization	1	73	43.15
2189	Making Pairs	1	48	16.54	34 42
2202	Tan and His Interesting Game		46	25.18
2270	Balloons in a Box		172	23.77
2271	Undecodable Codes		48	12.27
2272	Crossing the Desert		54	20.12
2273	Ferries		32	18.75
2274	Island Hopping	1	207	25.14	17 1
2275	Toil for Oil		15	28.65
2276	Partitions	1	24	13.02	34 26
2277	Silly Sort	30	882	55.45	17 27
2317	Bracket Sequence	1	57	23.73	26 34
2318	Overlapping Words		90	22.40
2319	Sequence		218	28.12
2320	Manhattan	9	703	32.39	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	3282	27.21	7 16
2413	Building Beacons		42	19.84
2414	Calculate The Cost	8	343	22.37	28 17
2415	Kirchhof Law	2	105	21.42	17 17
2416	Distinct Subsequences	94	3783	36.34	12 22
2417	Eliminate The Enemies		22	19.74
2418	Flying Frogs		63	35.71
2419	G-Line Grid	1	4	3.31
2420	Hospital at Hands		31	23.44	34 34
2421	Incrementing The Integer	1	53	24.29	17 50
2422	Jazzy Job	2	67	32.35	9 17
2423	Minimal Triangulations of Graphs		31	35.09
2426	Palindromes	10	1026	24.80	16 15

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