Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
2829	Time Limit Exceeded	4	255	21.42	34 34
2882	The Warehouse	1	26	30.15	34 17
3003	Median Filter	2	21	43.26	34 34
3004	Life Game	-1	75	35.09	34 1
3070	How many subsequences	1	97	9.80	34 34
3310	Serial Numbers	1	35	29.84	34 17
3382	Monster Trap	1	31	23.70	34 17
3390	Tribe Council	1	62	21.03	34 34
3414	Bora Bora		146	49.14	34 26
3464	Clock	3	63	36.03	34 9
3578	Hashing	1	41	11.88	34 34
3581	Tree Similarity	1	26	38.30	34 34
3863	Area of circles	1	312	29.53	34 34
3889	Closest Number	1	194	30.20	34 26
3896	Maximal Independent Set	2	60	24.81	34 42
3930	Group Partition	1	71	30.23	34 34
3980	Point Visible	1	48	27.40	34 50
4182	Candy (Again)	2	233	18.67	34 34
4306	The way to Bytemountain	1	32	40.00	34 34
4456	Jumbo Airlines	2	76	37.14	34 34
4458	Rainbow	2	37	19.44	34 42
4593	Arithmetic sequence	1	65	9.13	34 17
4657	Gas Wars		143	35.64	34 17
4669	Cross Mountain Climb Extreme	1	36	17.16	34 50
4941	Integer Factorization (20 digits)	8	606	55.34	34 30
5120	Minimal Possible String	4	61	5.34	34 30
5147	Fire-Control System		36	21.98	34 17
5469	Houses	1	45	25.97	34 26
5511	Heavy Sequences	-1	83	18.30	34 34
5830	Alternating Permutations	1	61	37.69	34 34
5902	Tri	1	79	20.33	34 50
5975	Travelling Knight	2	52	32.40	34 34
6044	Minimum Diameter Circle	1	446	27.76	34 42
6169	Standing Sequence	2	121	28.46	34 39
6578	Segment Tree	1	53	9.91	34 34
6678	Load Testing		204	59.69	34 34
6717	Two Paths	9	230	17.78	34 36
6824	Flag	1	77	24.69	34 34
6917	Catch Sheep	2	39	25.10	34 34
6926	Tree game	1	52	8.94	34 34
7152	Boundary 2003	1	18	12.50	34 1
7155	Test	10	413	19.07	34 27
7579	Power Calculus		319	49.37	34 17
7623	Divisors VI	2	27	14.16	34 34
7760	Kids’ Wishes	1	94	31.79	34 1
7762	Electric Needs	1	24	37.84	34 17
7851	Stacks of Zippy	1	18	16.19	34 34
7857	Tower Game (Hard)		60	14.36	34 34
7868	Join	1	19	45.56	34 17
7881	Ljutnja	3	638	24.24	34 21

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