Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
19687	Symmetric matrix 2		0	0.00
32065	Save Lord Tachanka	1	0	0.00
35535	Bill of Fare		0	0.00
36644	Minimum string moves	1	0	0.00	34 1
36896	Supraiden		0	0.00
3647	Moebius		1	2.56
10683	DRIVE		1	2.50
23435	Game Calculator		1	5.88
35287	Magical Matrices	1	1	1.59	17 34
275	The Water Ringroad		2	9.30
363	Crane Operator		2	0.95
9000	Bob and his new kite factory		2	1.42
10443	Bridges		2	3.28
13895	Party Time		2	31.25
21135	Distinct Viewpoints		2	50.00	34 1
22320	Polynomial Drawing		2	14.29
2019	The Rolling Ball		3	5.26
6957	Partial Palindrome		3	8.33
12805	Age of Empires		3	15.62
13816	Pheversos Game		3	23.53
14665	Delta catheti (hard)	1	3	17.50
14700	Delta catheti II (Hard)	1	3	7.55
15091	One Good Base Deserves Another		3	57.14	34 1
15381	Cut The Rope		3	17.95	42 1
22177	RajaRani	3	3	4.35	17 17
32028	Ada and Parties		3	1.25	50 50
34385	Pripyat		3	15.00
41790	Spy Reloaded		3	8.51
850	Soccer Choreography		4	4.00
2419	G-Line Grid	1	4	7.14
3482	Alias		4	57.14
3483	Begin		4	11.11
4189	Landing		4	3.64
11384	Zoom Operation		4	20.00
11900	Spelling Suggestion		4	12.82
12806	Blackjack		4	27.78
12855	Teleport		4	14.63	17 34
13882	THE WITTY BOY	1	4	4.28	34 17
13926	Flipping Slipping of grids	1	4	25.00	17 50
13945	GHALIBS CHALLENGE		4	33.33
15382	Factorial (Again!)		4	40.91	50 1
17779	Charlie and the Chocolate Factory		4	11.90
21969	Money Transfers		4	23.81
22675	A conjecture of Paul Erdős (hard)	2	4	5.56	34 34
25336	Eefun Plays Doto		4	31.03
26183	Laser Beam 2.0	1	4	18.18	17 17
26843	Who is the Best?		4	28.57
34357	Ludic Numbers (hard)	2	4	17.91
34973	Yet Another Subset Sum Problem	2	4	3.51	26 34
5637	LL and ErBao		5	50.88