Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
12855	Teleport	4	16.22	17 34
12887	Ant Colony Optimization	41	63.27
12903	Saving BOB - 2	10	38.98	17 1
12958	Another Gift Problem	35	18.33
12961	Drastic Grapes	36	32.24
12964	Count on a treap	9	50.00
13020	Help MR BEAN	10	10.87	1 1
13031	Vision Field	27	23.89	34 34
13049	The Loyalty of the Orcs	89	28.27
13092	Snakes and Ladders Again	86	14.52
13094	Beggars	47	27.23	50 50
13118	The Rook and The Rookette	30	25.00	17 17
13120	FizzBuzz Happy 2013	12	60.87
13156	Tom and Jerry	26	12.09
13166	Totient in permutation (medium)	17	50.10
13167	Totient in permutation (hard)	7	20.57
13223	The BrainFast Processing! Classical version	9	43.66	50 17
13362	Median of sub-sequences	30	36.80
13365	Move the boulder	5	10.34
13369	Cut on a tree	9	6.53
13382	Kindergarten Painting Competition	36	38.10
13404	The Encrypted Password	166	37.36	17 17
13508	Madotsuki Pattern	9	43.48
13511	Determine the vismin value !	37	29.80
13591	Factor y Hell	9	23.91	50 34
13621	Security	24	43.08
13622	Dead Pixels	23	25.52
13815	India in Box	21	14.16
13816	Pheversos Game	3	23.53
13826	The Grandslam of Grandslams!	11	17.50
13884	FLING1	55	23.60
13895	Party Time	2	31.25
13918	String Queries	31	28.57
13941	The AMSCO cipher	246	37.76	17 17
13945	GHALIBS CHALLENGE	4	33.33
13948	Disjoint Subtrees	19	48.80	34 34
14031	Spring Primality	21	25.26
14034	Autumn Leaves	12	42.55
14035	Winter Crush	18	32.46
14181	LIFE IS A RACE	11	32.86
14387	Science	13	20.24
14751	Self Descriptive Number	42	57.29
14819	Permutation Generator	27	38.10
14830	The Codefather	8	6.07	1 1
14833	The Fox and the Wolf	15	29.28	17 17
14839	Boxdropper	17	34.34	17 17
14848	Boxlings	14	11.05
14858	digit count	39	23.84
14883	Box Factory	15	37.78
14889	Good Strategy	53	39.36

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