Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
1838	Ticket to Ride	79	39.69
1842	Lineland Airport	32	18.87
1865	Making Waves	187	43.26	26 9
1877	Enrich my purse	152	27.14
1880	Hanoi Calls	203	55.14
1962	Circles	56	18.68
1963	Image Projections	102	32.04
1964	Tree cut	146	37.95
1966	Ski Valley	114	18.90
2002	Random Number Generator	97	42.09
2019	The Rolling Ball	3	5.26
2022	Truth Or Lie	101	22.44
2023	One Instruction Computer Simulator	41	11.22	42 42
2031	Please help You-Know-Who	35	32.89
2052	Hexagonal Parcels	75	29.07
2060	Tough Water Level	34	26.34
2070	Minimum Distance	77	19.15	17 1
2129	Cake	69	21.65
2130	Trolls	29	46.03
2132	Puzzle	87	33.11
2140	(un)Fair Play	74	38.91
2141	Golden Garden	17	17.86
2142	Arranging Flowers	23	9.57
2144	K Edge-disjoint Branchings	9	16.21
2147	Root of a Linear Equation	59	8.47	34 17
2151	Digital Calculator	22	5.81
2153	Internet is Faulty	64	41.34
2154	Kruskal	82	15.05
2159	Delicious Cake	29	16.00
2160	Here-There	27	26.63
2161	Pixel Shuffle	29	19.57	50 17
2162	Towers of Powers	28	19.72
2180	Justice League	78	48.80
2202	Tan and His Interesting Game	42	23.76
2270	Balloons in a Box	164	23.65
2271	Undecodable Codes	46	13.01
2272	Crossing the Desert	50	19.24
2273	Ferries	29	17.75
2275	Toil for Oil	13	30.72
2318	Overlapping Words	88	22.70
2319	Sequence	214	28.38
2323	Broken Compass	41	13.45
2325	String Distance	210	21.18
2413	Building Beacons	40	32.58
2417	Eliminate The Enemies	22	26.79
2418	Flying Frogs	57	37.43
2420	Hospital at Hands	25	23.08	34 34
2423	Minimal Triangulations of Graphs	27	33.33
2485	Phone Lines	18	17.80
2511	Magic Program IV	27	17.99