Sphere Online Judge (SPOJ)

list of tutorial problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
25590	Sum of fractions	1	10	57.89
26804	Pyramids	1	51	57.89
13383	Next odd extreme golf	-1	22	57.78	50 1
10491	GCD		163	57.77
14205	Big Fibonacci		12	57.69
19559	Breakup App		10	57.58	1 1
15761	Replace Letters	-1	74	57.56
15428	Cartman Reverses Strings 200 pts		54	57.55	1 1
8754	Cout		44	57.47
8621	Prime Permutations (easy)	1	126	57.24	1 34
14744	Beautiful Numbers	1	492	57.24	9 9
3252	Persistent Bits	1	28	57.14	17 17
7267	Basics		3	57.14
8443	Problem 4		27	57.14
15633	Bullseye		11	57.14
20854	The world and Contients		96	57.14
22220	Julius Princes Test		9	57.14
7775	Explicit Formula		1712	57.09	1 1
26495	More pairs are better		21	57.01
24990	Todos Distintos		37	56.98
10681	MAG		33	56.96
8459	AVERYEASYPROBLEM		66	56.94
25903	Bhadra Da and Counting "wow"		43	56.88	1 1
21098	HardDisk Drive		21	56.76
13422	THE JUMPING BALL		54	56.74
13276	Who is Mafia	1	213	56.72	21 21
23436	Look and Say	1	16	56.67	1 1
25217	NOTA INFORMATICA		30	56.60
14199	Prime Summation		9	56.52
34139	Topological Sorting	-1	98	56.52	1 1
16246	Trener		581	56.49
11581	The Famous Clock		127	56.32
3081	Look and Say	1	274	56.22	1 17
9114	String Game	1	63	56.20
15388	Easy One For Cartman		59	56.03
4215	Inversions		54	55.98
14091	Mighty Powers		57	55.97
25140	Bit Shuffling		41	55.95
8901	BRAINF__K DESIGN	1	21	55.81
22261	Maximum Subset Sum	2	397	55.70	4 6
9369	Progression	1	676	55.69	1 1
13677	Azooz		239	55.68
11349	Tertiary Calculator		3	55.56
16555	Name Scraping		12	55.56
25592	Christmas shopping		5	55.56
18930	Number of digits		56	55.17
4873	ABC Blocks	1	99	55.14	17 17
11559	Are you smart enough		22	55.10
4138	Harry and big doughnuts	4	10462	55.01	3 4
12072	Playing With Bits		172	54.99