Sphere Online Judge (SPOJ)

list of tutorial problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
20415	Just draw a square		33	60.71
20677	Easy Equation		20	29.41
20748	Remove Duplicates		86	58.86
20749	Remove Duplicates 2		234	63.68
20750	Remove Duplicates 3		23	9.46
20762	Recursive Functions		28	62.50
20763	Journey of nikki	1	20	32.81
20765	Friendship Bond	1	14	36.51
20766	nikkiNXN		12	30.00
20771	Simplest Pattern Search with Spaces		45	48.28
20847	Students Database		24	52.54
20853	Rotations		107	49.39
20854	The world and Contients		101	57.01
20866	National Day Vietnam 2 9 2014		11	47.22
21056	Vowel again		16	89.47
21097	XYZ-Strings		17	29.63
21098	HardDisk Drive		25	56.82
21168	At random		306	38.47
21182	Sum of Digits		32	67.69
21408	2x2 Subgrid Sum Problem (hard)		4	9.09
21410	A Gift for You 2		35	20.22
21523	A multiplied B equal to N		1	7.89
21556	Square		101	33.07
21558	Carl Friedrich Gauss		19	61.29
21559	Khoj The Search		15	66.67
21561	Amazing Subset		96	32.92
21563	Annie’s 18th Birthday		13	66.67
21565	Count the miscall		11	17.81
21566	Dictionary		7	9.86
21567	Add		11	35.56
21568	Shopkeeper Order		19	84.00
21569	Find out Defect Ball		12	45.95
21570	Triangle Under a Circle		18	66.67
21571	Prime Land and Next Prime number	1	14	17.81	17
21583	Print ♥		11	50.00
21647	String Jutsu		17	64.52
21675	VEGETABLE SHOPKEEPER 1		24	50.00
21681	Find Unchanged Position		22	93.75
21741	Pipage		86	18.41
21746	Rooks and pawns		86	18.64
21860	Chances of Win		16	67.65
21862	Number of Paths		25	50.94
21864	Next Largest In a Range		16	68.00
21865	Quick Transaction		22	76.67
22059	Jumping Cat	1	8	37.93
22061	DAY AND DATE		13	32.69
22089	CPCTriangle		19	36.84
22122	Victory Day Party		17	46.34
22123	Destroy Enemy Camp		7	26.67
22131	KINGDOM		9	37.04