Sphere Online Judge (SPOJ)

list of tutorial problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
5779	Interleaved Periodic String		42	54.76
5447	Probability One		474	69.41
5387	Interesting determinant		49	46.15
5371	Rational Number		144	42.80
5313	Root of the Problem		184	50.24	1 1
5302	Surprising Strings		24	52.00	17 1
5241	Alchemy		446	54.04
5228	Old problem		47	29.69
5200	Lsu Football		27	85.22
5195	Angry Knights		20	30.43
5194	Robbery	1	277	58.34	17 17
5132	Hello Kitty	6	4366	44.86	5 1
5037	Fibonacci Counting System	-1	27	90.70
5012	Spanish Conjugation	1	74	36.56	17 1
5009	Alphabet Arithmetic		71	29.51
4907	Most Common Letter	1	222	41.22	1 1
4906	Pythagorean Triples	1	1003	60.28	1 1
4897	Meowist Networking	8	894	36.68	14 4
4873	ABC Blocks	1	99	55.14	17 17
4872	Good Sequence		234	69.72
4869	Flat Land		2	12.00
4865	Yupana inca		25	74.42
4854	Primo Kripta		23	35.87
4834	Happy Sequence		245	74.44
4832	Pitagoras y Fermat		27	34.59
4830	Z meet	-1	151	76.09
4788	MCD		95	74.83
4770	Add and Reverse Sums		196	29.77
4768	Cool Numbers		203	37.21
4762	Desde Hasta	1	198	33.37	17 17
4554	Relax! It is just a game	-8	3869	48.45	1 4
4543	Mysterio s Menace		85	38.85
4522	Adding Base36 BigNumbers	1	55	34.33
4500	Helms Deep		120	39.75	1 1
4474	Longest Palindromic Substring	23	1225	21.48	22 20
4422	A Dwarf - N Snow Whites		0	0.00
4304	Pawn		13	43.75
4301	Tables	14	6598	54.00	2 3
4245	Place the Numbers I		6	3.35
4215	Inversions		54	55.98
4207	Mobile (Again)		13	61.29
4205	Highway - MSE07F		7	69.23
4196	Internet Service Providers		44	29.79
4193	Quick answer		4	16.00
4192	Lucky cities		17	32.88
4190	A plus B	2	95	9.40	1 1
4171	DIOPHANTINE		180	40.76
4138	Harry and big doughnuts	4	10474	55.03	3 4
4074	Compile Error		221	58.35	9 1
4073	The 3n plus 1 problem	3	4062	35.90	20 14