Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
10425	Security System		25	54.24
10437	Quadrilaterals		73	30.28
10440	Friends		32	20.25
10443	Bridges		1	7.14
10444	Coding	1	99	35.55
10447	Contaminated City		69	13.63
10449	Resource Management		15	25.96
10450	Amoeba		98	17.32
10451	Stun Boosting		17	27.38
10454	Greens Land		96	28.21
10461	The magical escape		32	53.33
10465	One Theorem, One Year		45	42.08
10476	Fair bases		37	35.71
10506	Prendonians		50	29.35
10507	Cheese-rolling World Cup		54	33.50
10508	Buttons		45	24.77
10538	Derp		55	38.04
10571	Soccer Challenge		30	46.51
10574	Soccer Ceremony		19	39.44
10576	Exclusive Security	-1	96	26.06
10581	Ball Stacking Again	1	151	31.26
10585	Searching God		82	26.37
10586	Problems in Moria		29	28.70
10587	Enemies		35	34.07
10589	King		65	27.94
10607	Delivery		32	25.64
10621	MONO		22	16.44
10645	The Rail Network Renovation		94	33.85
10647	Divide And Conquer		11	16.90
10648	DUGDUG		48	25.63
10667	PASIJANS		66	48.17
10675	GENIJALAC		46	50.52
10683	DRIVE		1	2.50
10701	The Lazy Gamer		16	13.61
10799	Happiness at the lowest cost		12	4.84
10800	GAME		21	12.64
10809	Unlock it !		82	30.26
10814	Unique Paths		125	46.39
10822	The Prime Minister	1	26	13.35
10841	Supplying the Suppliers	1	11	34.68
10883	Customs		14	31.25
10945	Foodie Golu		62	28.23
11054	Discords Dilemma		23	27.52
11090	Large banner		30	33.04
11117	Restacking haybales 2012		218	56.82
11157	The Great Escape		77	44.84
11179	Korra in the Spirit World		26	41.24
11276	Adventure		44	37.36
11334	Lucifer Sort		7	7.17	34
11355	SQUARE TO SQUARE		21	17.74