Sphere Online Judge (SPOJ)

list of tutorial problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
9369	Progression	1	676	55.69	1 1
22261	Maximum Subset Sum	2	399	55.72	4 6
8901	BRAINF__K DESIGN	1	21	55.81
25140	Bit Shuffling		41	55.95
14091	Mighty Powers		57	55.97
4215	Inversions		54	55.98
15388	Easy One For Cartman		59	56.03
9114	String Game	1	63	56.20
3081	Look and Say	1	274	56.22	1 17
11581	The Famous Clock		129	56.47
16246	Trener		581	56.49
14199	Prime Summation		9	56.52
25217	NOTA INFORMATICA		30	56.60
23436	Look and Say	1	16	56.67	1 1
34139	Topological Sorting	-1	99	56.71	1 1
13276	Who is Mafia	1	213	56.72	21 21
13422	THE JUMPING BALL		54	56.74
21098	HardDisk Drive		21	56.76
25903	Bhadra Da and Counting "wow"		43	56.88	1 1
8459	AVERYEASYPROBLEM		66	56.94
10681	MAG		33	56.96
24990	Todos Distintos		37	56.98
26495	More pairs are better		21	57.01
7775	Explicit Formula		1712	57.09	1 1
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
14744	Beautiful Numbers	1	492	57.24	9 9
8621	Prime Permutations (easy)	1	126	57.24	1 34
8754	Cout		44	57.47
15428	Cartman Reverses Strings 200 pts		54	57.55	1 1
15761	Replace Letters	-1	74	57.56
19559	Breakup App		10	57.58	1 1
14205	Big Fibonacci		12	57.69
10491	GCD		163	57.77
13383	Next odd extreme golf	-1	22	57.78	50 1
25590	Sum of fractions	1	10	57.89
26804	Pyramids	1	51	57.89
752	Power it!	11	418	57.95	17 17
8493	Colorful Blocks		191	58.04
1394	Dividing Spaces		17	58.06
12466	Closest Points		82	58.10	17 1
11317	MAX AREA	-1	143	58.20	1 1
13681	Matrix City		30	58.21
14752	FIZZBUZZ (Easy)		102	58.24
1680	Black and white painting	1	166	58.26	9 9
14867	PAIRS	1	49	58.28	17 17