Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %
1536	Help Blue Mary Please! (Act III)		30	14.61
1554	Zoo		115	28.60
1695	Grandpa’s Rubik Cube	1	111	60.94
1701	Earth Observation with a Mobile Robot Team		13	38.89
1708	Square Count		74	31.25
1709	Swamp Things		289	40.34
1722	Life, the Universe, and Everything II		65	28.86
1731	Counting Triangles III	1	265	33.73
1739	Yet Another Equation		232	41.18
1793	Text Generater II		54	30.00
1803	Fold		59	42.86
1810	Nuclear Plants		21	11.51
1815	Problems Collection (Volume X)		77	7.26
1838	Ticket to Ride		88	41.61
1839	The Bookcase	1	128	36.33
1842	Lineland Airport		36	19.49
1877	Enrich my purse		153	27.01
1880	Hanoi Calls		204	53.99
1962	Circles		61	19.96
1963	Image Projections		106	33.80
1964	Tree cut		148	37.97
1966	Ski Valley		115	18.24
2002	Random Number Generator		98	40.83
2019	The Rolling Ball		3	4.41
2022	Truth Or Lie		104	21.17
2031	Please help You-Know-Who		38	28.42
2047	Stone Removing Game	-1	133	38.16
2052	Hexagonal Parcels		75	28.71
2060	Tough Water Level		35	17.95
2129	Cake		71	21.52
2130	Trolls		29	39.19
2132	Puzzle		88	32.46
2140	(un)Fair Play		75	38.08
2141	Golden Garden		17	12.20
2142	Arranging Flowers		25	9.87
2144	K Edge-disjoint Branchings		9	12.46
2151	Digital Calculator		23	5.73
2153	Internet is Faulty		66	37.50
2154	Kruskal		84	13.95
2159	Delicious Cake		29	14.39
2160	Here-There		29	24.76
2162	Towers of Powers		26	15.07
2171	Ambiguous Codes	1	85	39.10
2177	Galou is back!	-1	225	31.22
2180	Justice League		78	48.06
2185	Musical Optimization	1	72	42.92
2202	Tan and His Interesting Game		45	24.76
2270	Balloons in a Box		171	23.69
2271	Undecodable Codes		47	12.08
2272	Crossing the Desert		53	19.88