Sphere Online Judge (SPOJ)

list of tutorial problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
4207	Mobile (Again)		14	62.86
4215	Inversions		54	55.37
4245	Place the Numbers I		7	5.98
4301	Tables	14	6613	54.01	2 3
4304	Pawn		13	43.75
4422	A Dwarf - N Snow Whites		0	0.00
4474	Longest Palindromic Substring	24	1281	21.85	22 20
4500	Helms Deep		120	41.71	1 1
4522	Adding Base36 BigNumbers	1	56	34.80
4543	Mysterio s Menace		85	38.85
4554	Relax! It is just a game	-8	3872	48.46	1 4
4762	Desde Hasta	1	199	33.40	17 17
4768	Cool Numbers		204	37.19
4770	Add and Reverse Sums		199	30.04
4788	MCD		95	74.83
4830	Z meet	-1	151	76.09
4832	Pitagoras y Fermat		27	34.59
4834	Happy Sequence		247	74.63
4854	Primo Kripta		25	36.84
4865	Yupana inca		25	74.42
4869	Flat Land		2	12.00
4872	Good Sequence		234	69.57
4873	ABC Blocks	1	100	54.84	17 17
4897	Meowist Networking	8	894	36.68	14 4
4906	Pythagorean Triples	1	1006	60.28	1 1
4907	Most Common Letter	1	222	40.81	1 1
5009	Alphabet Arithmetic		71	29.51
5012	Spanish Conjugation	1	75	36.84	17 1
5037	Fibonacci Counting System	-1	28	88.89
5132	Hello Kitty	6	4377	44.80	5 1
5194	Robbery	1	279	58.49	17 17
5195	Angry Knights		20	30.43
5200	Lsu Football		27	85.09
5228	Old problem		47	30.41
5241	Alchemy		456	53.46
5302	Surprising Strings		27	53.70	17 1
5313	Root of the Problem		186	50.36	1 1
5371	Rational Number		144	42.80
5387	Interesting determinant		49	46.15
5447	Probability One		477	69.43
5779	Interleaved Periodic String		42	47.83
5848	Filip		345	66.84
5871	Grid		76	21.35	1 1
5872	Anagram		881	44.78	1 1
5873	Rnumber	1	11	25.00	17 17
5874	Square	-1	47	22.18	1 1
5899	A simple equation	3	274	40.05	9 17
5900	Decreasing Strings	-1	84	48.76
5965	The Element of Surprise		123	49.49
5966	Generalized Chess		42	44.14