Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
9890	Piece it together	95	24.14
9891	Please, go first	219	54.35	26 17
9893	Smoking gun	40	27.98
9895	Tracking RFIDs	52	31.94
9896	Train delays	46	25.87
9936	Construct the Great Wall	9	41.67
9940	Fruit Ninja	41	28.05
9944	Ji-Tu Problem	16	10.49
9968	Magic Crystals and Laser Beams	179	23.53
9970	The Egyptian Parliament	49	18.84
9971	Adventurous Chess Masters	21	45.40
9974	Men From Mars	22	39.66
10071	Working at the Restaurant	34	38.71
10074	Genetics	9	33.33
10076	Slalom	30	33.33
10077	Routing	23	43.55
10081	Periodic Points	12	38.89
10082	Comparing Answers	62	12.87
10084	Fake Scoreboard	24	45.95
10086	Jumping Monkey	58	25.31
10087	Sensor Network	27	21.09
10088	Assembly Line	33	33.33
10091	Three-sided Dice	31	22.88
10092	Party Night	28	31.63
10095	Caper Pizza	26	25.58
10096	Lights (Extreme)	55	30.00	17 17
10105	Alphabet Soup	30	45.83
10106	Coin Collecting	47	37.18
10109	Game, Set and Match	96	65.73
10110	Guess the Numbers	124	44.36	17 17
10112	Peer Review	117	32.95
10113	Regular Convex Polygon	99	30.09
10141	STRAZA	44	43.18	34 17
10230	Robbing Gringotts	54	11.02
10242	Dice on a Board	20	32.24
10265	Subdivision of the kingdom	38	29.74
10377	project groups	130	51.04	34 34
10419	Polish Language	102	26.08
10421	Run, Snipe, Run	75	28.44
10425	Security System	26	53.12
10437	Quadrilaterals	75	28.07
10439	Walking Robot	111	45.62	34 34
10440	Friends	32	18.90
10443	Bridges	2	2.99
10447	Contaminated City	69	13.57
10449	Resource Management	15	23.48
10450	Amoeba	101	17.33
10451	Stun Boosting	16	24.42
10454	Greens Land	96	28.00
10461	The magical escape	31	47.96