Sphere Online Judge (SPOJ)

list of tutorial problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
4207	Mobile (Again)		15	62.16
4215	Inversions		56	54.89
4245	Place the Numbers I		7	5.98
4301	Tables	14	6617	53.98	2 3
4304	Pawn		15	48.94
4422	A Dwarf - N Snow Whites		0	0.00
4474	Longest Palindromic Substring	24	1292	21.91	22 20
4500	Helms Deep		121	41.87	1 1
4522	Adding Base36 BigNumbers	1	58	35.44
4543	Mysterio s Menace		85	38.85
4554	Relax! It is just a game	-8	3876	48.44	1 4
4762	Desde Hasta	1	202	33.60	17 17
4768	Cool Numbers		205	37.29
4770	Add and Reverse Sums		199	30.04
4788	MCD		95	74.83
4830	Z meet	-1	151	73.84
4832	Pitagoras y Fermat		28	35.00
4834	Happy Sequence		248	74.51
4854	Primo Kripta		25	36.84
4865	Yupana inca		25	74.42
4869	Flat Land		2	12.00
4872	Good Sequence		239	70.10
4873	ABC Blocks	1	103	55.45	17 17
4897	Meowist Networking	8	895	36.70	14 4
4906	Pythagorean Triples	1	1007	60.30	1 1
4907	Most Common Letter	1	226	41.23	1 1
5009	Alphabet Arithmetic		73	29.86
5012	Spanish Conjugation	1	77	37.39	17 1
5037	Fibonacci Counting System	-1	28	88.89
5132	Hello Kitty	6	4380	44.81	5 1
5194	Robbery	1	280	58.23	17 17
5195	Angry Knights		21	30.99
5200	Lsu Football		29	85.47
5228	Old problem		47	29.35
5241	Alchemy		474	53.92
5302	Surprising Strings		28	48.39	17 1
5313	Root of the Problem		186	50.36	1 1
5371	Rational Number		147	42.69
5387	Interesting determinant		49	36.78
5447	Probability One		478	69.47
5779	Interleaved Periodic String		42	47.83
5848	Filip		346	66.90
5871	Grid		76	21.35	1 1
5872	Anagram		885	44.86	1 1
5873	Rnumber	1	12	25.86	17 17
5874	Square	-1	49	23.05	1 1
5899	A simple equation	3	289	41.14	9 17
5900	Decreasing Strings	-1	84	48.76
5965	The Element of Surprise		125	49.83
5966	Generalized Chess		45	46.09