Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
9755	Grey Area	294	61.58
9817	Shortcut	53	26.61	17 17
9856	The Glazier	68	47.47
9857	Eight Directions Crossword	134	15.08
9862	Help the Airline Company	11	23.91
9890	Piece it together	94	24.01
9891	Please, go first	216	54.10	26 17
9893	Smoking gun	40	27.98
9895	Tracking RFIDs	52	31.94
9896	Train delays	44	25.40
9936	Construct the Great Wall	9	41.67
9940	Fruit Ninja	40	27.40
9944	Ji-Tu Problem	14	10.42
9950	IQ Team	37	41.59	50 50
9968	Magic Crystals and Laser Beams	179	23.48
9970	The Egyptian Parliament	49	18.84
9971	Adventurous Chess Masters	20	43.79
9974	Men From Mars	22	39.66
10071	Working at the Restaurant	32	37.78
10074	Genetics	9	33.33
10076	Slalom	30	34.07
10077	Routing	22	44.83
10081	Periodic Points	12	40.00
10082	Comparing Answers	59	12.74
10084	Fake Scoreboard	23	45.21
10086	Jumping Monkey	55	25.06
10087	Sensor Network	27	20.69
10088	Assembly Line	34	40.43
10091	Three-sided Dice	28	20.83
10092	Party Night	28	36.47
10095	Caper Pizza	27	27.56
10096	Lights (Extreme)	55	30.25	17 17
10105	Alphabet Soup	29	48.81
10106	Coin Collecting	46	39.25
10109	Game, Set and Match	94	66.86
10110	Guess the Numbers	123	44.33	17 17
10112	Peer Review	116	32.71
10113	Regular Convex Polygon	96	29.62
10141	STRAZA	45	46.51	34 17
10230	Robbing Gringotts	53	10.94
10242	Dice on a Board	17	29.58
10265	Subdivision of the kingdom	34	33.33
10377	project groups	129	50.87	34 34
10419	Polish Language	100	25.72
10421	Run, Snipe, Run	73	30.00
10425	Security System	25	54.24
10437	Quadrilaterals	73	30.19
10439	Walking Robot	110	46.11	34 34
10440	Friends	32	20.25
10443	Bridges	2	3.28