Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
4574	Riding in cycles		41	24.31
5103	Top 10		41	16.26
5156	Flowers Placement		41	31.06
6819	Yet Another Assignment Problem	1	41	11.56	1
8586	Factorial factorisation	2	41	19.05	17 17
9447	Genetics		41	35.29
10075	Haunted Graveyard	2	41	19.47	26 26
12371	High Mountains		41	17.20	34 34
12887	Ant Colony Optimization		41	64.29
16240	Easy Password		41	5.09	17 26
17944	Mickey Mouse Magic Trick v4	1	41	56.41	1 34
21414	Count The Indexes 2	5	41	18.11	37 24
22552	Flow on Tree		41	47.12
26746	Gears	4	41	30.13	21 17
2413	Building Beacons		40	32.58
3361	Cavli	1	40	44.87	17 17
4003	Subway planning		40	18.08
4275	rotate it		40	55.70
4324	The fate of the pineapple		40	28.41
5153	Compressed String		40	30.00
5160	Jinyuetuan Puzzle		40	36.69
6711	Transform a Sequence		40	45.65
8651	Alien arithmetic	1	40	18.81
8734	Charlie and the Chocolate Factory	1	40	17.65	26 34
8795	Twenty Questions	1	40	20.65
8820	Okret	3	40	19.42	39 34
9893	Smoking gun		40	27.98
11474	Totient Game		40	36.40
11905	Tree Count		40	43.07
11921	Ball Stack	1	40	54.63	17 17
16389	Play with Strings	1	40	21.49	17 34
19153	Rooted Trees	1	40	21.43
19301	Operators (new ver)	3	40	6.54	38 17
25476	Induced favoritism	1	40	28.87	17 34
30349	Strange Waca	9	40	19.64	17 22
34636	Richie Rich and Keen Bean		40	40.54	17 17
35028	Long Tiling	6	40	21.45	21 21
36529	Challenge Accepted!	1	40	26.87	17 17
36537	Koala Fan	8	40	23.28	13 10
272	Cave Exploration		39	10.02	17 1
1447	A Game of Toy Bricks		39	29.93
1471	A Game of Pearls	1	39	30.00	17 17
3578	Hashing	1	39	11.76	34 34
3642	Pretty Printing		39	24.38
5155	Exciting Time		39	13.19
7556	B - Stock Charts		39	39.64
9723	Card Shuffling		39	26.69
9940	Fruit Ninja		39	26.73
12408	Johnny Studies Genetics		39	36.45
13592	Expected Time to Love	1	39	17.39	17 34

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