Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
760	Convex Hull 3D		117	41.56
827	Trigonometric optimization		77	27.87
850	Soccer Choreography		4	4.02
866	DNA Translation		117	21.59
900	Split Windows		31	56.90
901	Index Generation		37	53.09
903	Double Vision		64	56.49
944	Free Tour		16	3.34
972	Birthday		119	19.36
987	Mobile		70	15.53
999	Generalized Matrioshkas		412	32.54
1004	Polygon Encoder		54	9.27
1182	Sorted bit squence		287	41.76
1267	Origin of Life		33	19.82
1269	CN Tower (Hard)		22	11.50
1270	Paint By Numbers		19	19.62
1325	Partial Sums	2	222	24.78	17
1335	Maze		62	17.43
1421	Goods		140	30.65
1444	DEL Command II		32	8.74
1447	A Game of Toy Bricks		39	29.93
1451	01 Sequence		94	28.29
1452	Birthday Cake		62	21.52
1454	Memory Distribution		20	18.35
1455	Program Analyser		25	15.25
1456	The Secret of a Lost City		17	35.94
1458	Help Blue Mary Please! (Act II)	1	80	17.26
1460	A Simple Calculator in the Galaxy		32	40.50
1462	Barbarians		47	14.97
1463	Robot Number M		75	49.70
1464	Editor II		58	18.59
1468	Outside it is now raining		25	24.78
1472	Tom and Jerry		61	38.46
1473	Lemon Tree in the Moonlight		22	19.49
1477	Play with a Tree		87	14.51
1478	The Easiest Problem		69	9.05
1483	Colorful Lights Party		13	10.84
1487	Query on a tree III		518	17.01
1536	Help Blue Mary Please! (Act III)		29	21.26
1554	Zoo		110	29.26
1671	Another Mathematical Problem		61	11.52
1672	The Great Indian Wedding		43	22.58
1674	The Explosion		152	26.35
1678	Royal Treasury		70	11.71
1683	Expressions		354	40.02
1685	Grocery store		198	24.17
1689	Hard Problem		15	28.07
1695	Grandpa’s Rubik Cube	1	110	60.61
1701	Earth Observation with a Mobile Robot Team		10	40.74
1705	The Game of Efil		89	49.61