Sphere Online Judge (SPOJ)

list of tutorial problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
1394	Dividing Spaces		17	58.06
752	Power it!	11	420	58.02	17 17
15428	Cartman Reverses Strings 200 pts		55	57.94	1 1
25590	Sum of fractions	1	10	57.89
26804	Pyramids	1	51	57.89
15761	Replace Letters	-1	75	57.80
13383	Next odd extreme golf	-1	22	57.78	50 1
10491	GCD		163	57.77
22795	Consecutive Numbers		21	57.69
19559	Breakup App		10	57.58	1 1
8754	Cout		44	57.47
34139	Topological Sorting	-1	101	57.45	1 1
14744	Beautiful Numbers	1	495	57.39	9 9
8621	Prime Permutations (easy)	1	126	57.24	1 34
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
7775	Explicit Formula		1714	57.13	1 1
26495	More pairs are better		21	57.01
24990	Todos Distintos		37	56.98
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
16246	Trener		585	56.59
11581	The Famous Clock		130	56.54
14199	Prime Summation		9	56.52
25140	Bit Shuffling		43	56.32
28741	Partial Primes	1	9	56.25
3081	Look and Say	1	274	56.22	1 17
9114	String Game	1	63	56.20
25216	RETO SALARIOS		20	56.10
15388	Easy One For Cartman		59	56.03
4215	Inversions		54	55.98
14091	Mighty Powers		57	55.97
8901	BRAINF__K DESIGN	1	21	55.81
22261	Maximum Subset Sum	1	405	55.80	4 6
9369	Progression	1	676	55.69	1 1
13677	Azooz		239	55.58
11349	Tertiary Calculator		3	55.56
16555	Name Scraping		12	55.56
13389	Letter Count	1	693	55.28	1 1
18930	Number of digits		56	55.23
12072	Playing With Bits		172	54.99
4138	Harry and big doughnuts	4	10517	54.95	3 4