Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
13884	FLING1		57	23.74
13895	Party Time		2	14.29
13945	GHALIBS CHALLENGE		4	15.87
13978	Billion ByteMan March	1	7	25.86
14031	Spring Primality		22	19.08
14033	Late Summer Searching	1	12	33.33
14034	Autumn Leaves		13	38.89
14035	Winter Crush		27	36.84
14181	LIFE IS A RACE		12	27.47
14387	Science		23	26.19
14435	Decipher the AMSCO cipher	2	96	59.18	17
14665	Delta catheti (hard)	1	3	15.56
14700	Delta catheti II (Hard)	1	3	6.06
14751	Self Descriptive Number		49	56.81
14761	Almost-isosceles Pythagorean triple (easy)	1	67	41.93
14819	Permutation Generator		37	30.29
14848	Boxlings		20	25.00
14858	digit count		43	23.67
14883	Box Factory		15	33.96
14889	Good Strategy		56	38.86
14949	HELPER		13	39.47
14957	Chinese game		26	24.19
14991	Your Rank is Pure (EXTREME ver)		8	26.12
15060	Elegant Diamond		17	52.63
15061	World Cup 2010		28	42.67
15076	A Romantic Movie Outing		27	18.39
15089	Farmer Joe		6	14.86
15092	A Kleene Implementation		5	34.04
15249	Swap (Medium - Level 200)		6	19.81
15252	Humans Life Code		9	47.22
15360	World Record Lunch		23	12.41
15383	Transform the Expression (Again!)		7	31.25
15434	Life on Fornax		29	64.98
15435	Schedules		28	12.25
15453	Yet Another Electronic Device!!!	1	89	47.88
15460	Selling Art		9	12.50
15568	Fire Extinguishers		19	45.28
15572	Garden	-1	22	24.59
15573	Keyboard		16	28.17
15575	Kangaroos	1	20	23.78
15576	Aesthetic Text		16	22.08
15735	Balanced Food	1	10	19.61
16018	Edge Detection		14	53.33
16048	Help Rarity Collect Crystals		25	22.39
16062	Count Primes	-2	45	25.20
16178	Change		62	10.38
16297	Sir and The ICC Ratings		28	22.67
16410	Organizator		80	34.82
16411	Slasticar		24	55.17
16636	Journey		59	26.42