Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
13167	Totient in permutation (hard)		7	11.79
13978	Billion ByteMan March	1	7	25.86
15257	Partition function (HARD)		7	3.18	50 45
15383	Transform the Expression (Again!)		7	31.25
17320	Guess The Number With Lies v3	1	7	24.66	17 34
18521	Fortunate Wheels		7	34.78
27099	Road Times	1	7	32.50
30826	Bernoulli numbers	4	7	14.50	23 12
37272	Dinostratus Matrices	1	7	46.58
37444	Anti Hash II	1	7	43.94
37446	Breaking Math	2	7	21.51	50 50
40501	A Simple Sieve	3	7	8.70	45 50
3466	Another Longest Common Subsequence Problem		6	5.66
6230	Dictionary order		6	9.30
7010	Police Business		6	25.00
9086	Formula 3D		6	9.86
12804	Spy	1	6	12.24	50 50
12824	Print Big Binary Numbers		6	29.59
15089	Farmer Joe		6	14.86
15249	Swap (Medium - Level 200)		6	19.81
15250	Swap (Hard - Level 1000)	3	6	23.47	34 45
19276	Peculiar Permutivores		6	36.36
21409	2x2 Subgrid Sum Problem (generalized)	1	6	17.02
27341	Jumping Joey	1	6	18.42	34 17
32091	Chessboard State 2: International Chess Tournament	1	6	14.81	50 17
32092	Chessboard State 3: Intergalactic Chess Tournament	1	6	42.25	50 34
34385	Pripyat		6	26.09
41790	Spy Reloaded		6	8.43
42526	Village Unity	1	6	9.59
363	Crane Operator		5	2.71
5637	LL and ErBao		5	41.43
15088	Ancient Aliens		5	42.62	34 1
15092	A Kleene Implementation		5	34.04
22675	A conjecture of Paul Erdős (hard)	2	5	5.81	34 34
25450	When Does The World End	1	5	4.27	34 50
26181	Walking Jumper		5	24.24
34315	The Chase		5	8.22
35810	Prismata	1	5	5.71	34 17
42573	Seating Plan	1	5	29.73	17 17
850	Soccer Choreography		4	3.80
2019	The Rolling Ball		4	5.48
2419	G-Line Grid	1	4	3.31
3483	Begin		4	7.94
11384	Zoom Operation		4	16.00
12855	Teleport		4	11.32	17 34
13882	THE WITTY BOY	1	4	4.18	34 17
13945	GHALIBS CHALLENGE		4	15.87
15382	Factorial (Again!)		4	33.33	50 1
17779	Charlie and the Chocolate Factory		4	7.81
25336	Eefun Plays Doto		4	8.74

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