Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
10091	Three-sided Dice	31	22.00
10092	Party Night	30	30.00
10095	Caper Pizza	29	26.47
10096	Lights (Extreme)	56	29.80	17 17
10105	Alphabet Soup	31	42.57
10109	Game, Set and Match	102	66.32
10110	Guess the Numbers	124	44.36	17 17
10112	Peer Review	116	32.79
10113	Regular Convex Polygon	101	30.40
10141	STRAZA	49	40.13	34 17
10230	Robbing Gringotts	56	11.07
10242	Dice on a Board	20	31.76
10265	Subdivision of the kingdom	40	29.56
10377	project groups	132	51.55	34 34
10419	Polish Language	104	26.31
10421	Run, Snipe, Run	76	30.09
10425	Security System	29	53.42
10437	Quadrilaterals	75	25.42
10440	Friends	38	20.42
10443	Bridges	2	2.82
10447	Contaminated City	70	13.74
10449	Resource Management	15	18.00
10450	Amoeba	101	17.24
10451	Stun Boosting	19	25.68
10454	Greens Land	100	28.54
10461	The magical escape	31	40.52
10465	One Theorem, One Year	50	43.62
10476	Fair bases	38	32.69
10506	Prendonians	52	26.42
10507	Cheese-rolling World Cup	57	33.18
10508	Buttons	47	24.03
10538	Derp	61	40.00
10571	Soccer Challenge	30	34.78
10574	Soccer Ceremony	26	40.43
10585	Searching God	83	25.98
10586	Problems in Moria	41	28.98
10587	Enemies	43	37.50
10589	King	70	29.77
10607	Delivery	33	19.17
10621	MONO	22	15.48
10640	The Wild Wizard	97	26.76	1 1
10645	The Rail Network Renovation	100	33.39
10647	Divide And Conquer	13	17.28
10648	DUGDUG	50	25.38
10667	PASIJANS	69	48.52
10675	GENIJALAC	47	51.02
10683	DRIVE	1	1.37
10701	The Lazy Gamer	17	14.00
10799	Happiness at the lowest cost	17	5.44
10800	GAME	25	12.80