Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %
10081	Periodic Points		12	35.90
10082	Comparing Answers		63	13.05
10084	Fake Scoreboard		24	45.95
10085	Palindromic DNA	1	20	27.78
10086	Jumping Monkey		58	25.64
10087	Sensor Network		27	20.95
10088	Assembly Line		37	32.82
10091	Three-sided Dice		30	21.48
10092	Party Night		29	29.36
10095	Caper Pizza		28	25.93
10105	Alphabet Soup		30	42.00
10106	Coin Collecting		47	35.26
10109	Game, Set and Match		100	65.78
10112	Peer Review		117	32.95
10113	Regular Convex Polygon		100	30.24
10230	Robbing Gringotts		55	11.03
10235	Array Diversity	1	192	23.96
10242	Dice on a Board		20	32.24
10265	Subdivision of the kingdom		39	29.50
10292	Shell game	-1	503	19.03
10419	Polish Language		102	26.06
10421	Run, Snipe, Run		74	30.03
10425	Security System		28	52.78
10437	Quadrilaterals		75	25.67
10440	Friends		34	19.20
10443	Bridges		2	2.82
10444	Coding	1	101	34.90
10447	Contaminated City		70	13.74
10449	Resource Management		15	18.75
10450	Amoeba		101	17.33
10451	Stun Boosting		19	25.85
10454	Greens Land		98	28.26
10461	The magical escape		31	40.52
10465	One Theorem, One Year		49	43.32
10476	Fair bases		38	32.69
10506	Prendonians		51	26.07
10507	Cheese-rolling World Cup		56	32.86
10508	Buttons		46	23.71
10538	Derp		59	38.85
10571	Soccer Challenge		30	35.40
10574	Soccer Ceremony		25	41.67
10576	Exclusive Security	-1	98	26.64
10581	Ball Stacking Again	1	157	30.76
10585	Searching God		83	25.98
10586	Problems in Moria		40	28.57
10587	Enemies		41	36.62
10589	King		70	29.77
10607	Delivery		33	19.17
10621	MONO		22	15.79
10645	The Rail Network Renovation		98	33.33