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	6606	54.00	2 3
4304	Pawn		13	43.75
4422	A Dwarf - N Snow Whites		0	0.00
4474	Longest Palindromic Substring	24	1267	21.75	22 20
4500	Helms Deep		120	41.71	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	3871	48.45	1 4
4762	Desde Hasta	1	198	33.47	17 17
4768	Cool Numbers		204	37.19
4770	Add and Reverse Sums		198	29.95
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	100	54.84	17 17
4897	Meowist Networking	8	894	36.68	14 4
4906	Pythagorean Triples	1	1004	60.24	1 1
4907	Most Common Letter	1	222	40.93	1 1
5009	Alphabet Arithmetic		71	29.51
5012	Spanish Conjugation	1	74	36.56	17 1
5037	Fibonacci Counting System	-1	28	88.89
5132	Hello Kitty	6	4375	44.79	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		446	54.04
5302	Surprising Strings		26	52.83	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		476	69.40
5779	Interleaved Periodic String		42	47.83
5848	Filip		344	66.79
5871	Grid		75	20.45	1 1
5872	Anagram		878	44.87	1 1
5873	Rnumber	1	11	25.00	17 17
5874	Square	-1	47	22.18	1 1
5899	A simple equation	3	264	39.93	9 17
5900	Decreasing Strings	-1	83	48.77
5965	The Element of Surprise		122	49.32
5966	Generalized Chess		42	44.14