Sphere Online Judge (SPOJ)

list of tutorial problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
4207	Mobile (Again)		13	61.29
4215	Inversions		54	55.98
4245	Place the Numbers I		6	3.35
4301	Tables	14	6589	53.99	2 3
4304	Pawn		13	43.75
4422	A Dwarf - N Snow Whites		0	0.00
4474	Longest Palindromic Substring	23	1217	21.46	22 20
4500	Helms Deep		120	39.75	1 1
4522	Adding Base36 BigNumbers	1	55	34.33
4543	Mysterio s Menace		85	38.85
4554	Relax! It is just a game	-8	3869	48.45	1 4
4762	Desde Hasta	1	198	33.37	17 17
4768	Cool Numbers		203	37.21
4770	Add and Reverse Sums		195	29.68
4788	MCD		95	74.83
4830	Z meet	-1	151	76.09
4832	Pitagoras y Fermat		27	34.59
4834	Happy Sequence		245	74.44
4854	Primo Kripta		23	35.87
4865	Yupana inca		25	74.42
4869	Flat Land		2	12.00
4872	Good Sequence		234	69.72
4873	ABC Blocks	1	99	55.14	17 17
4897	Meowist Networking	8	894	36.68	14 4
4906	Pythagorean Triples	1	1002	60.26	1 1
4907	Most Common Letter	1	222	41.22	1 1
5009	Alphabet Arithmetic		71	29.51
5012	Spanish Conjugation	1	74	36.56	17 1
5037	Fibonacci Counting System	-1	27	90.70
5132	Hello Kitty	6	4365	44.85	5 1
5194	Robbery	1	277	58.34	17 17
5195	Angry Knights		20	30.43
5200	Lsu Football		27	85.22
5228	Old problem		47	29.69
5241	Alchemy		446	54.04
5302	Surprising Strings		24	52.00	17 1
5313	Root of the Problem		184	50.24	1 1
5371	Rational Number		144	42.80
5387	Interesting determinant		49	46.15
5447	Probability One		474	69.41
5779	Interleaved Periodic String		42	54.76
5848	Filip		343	66.73
5871	Grid		75	20.45	1 1
5872	Anagram		878	44.87	1 1
5873	Rnumber	1	10	28.00	17 17
5874	Square	-1	45	21.19	1 1
5899	A simple equation	3	263	39.90	9 17
5900	Decreasing Strings	-1	83	48.77
5965	The Element of Surprise		122	49.32
5966	Generalized Chess		42	44.14