Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
17394	Bits Game		50	34.44	1 34
17402	Joy of Arbitrage	1	19	16.91	50 34
17660	The Bridge to Home	5	122	36.19	23 34
17877	Two Swamills	1	142	51.84	17 34
17944	Mickey Mouse Magic Trick v4	1	46	56.59	1 34
18102	New year love story	2	83	26.67	34 34
18153	Robert Langdon & The Rule of Three	3	41	36.36	23 34
18170	Takeover Wars	1	18	15.49	1 34
18248	Maggu’s Solar Panels	2	50	32.03	34 34
18469	Office Mates	1	53	32.46	17 34
18666	Radiation	2	36	20.00	17 34
18667	Product of factorials (hard)	3	46	27.10	28 34
19084	Huge Pascal triangle	1	34	47.92	9 34
19125	Hexadecimal value of Pi	2	36	58.04	26 34
19143	TRISQRS		172	38.08	28 34
19148	Kill them All	3	129	23.60	28 34
19150	Infinite Sequence	1	154	30.20	1 34
19154	Terrorist Attack	1	23	35.46	34 34
19224	Lights, Snakes and Cages	5	93	16.64	24 34
19382	Stock	2	99	32.39	26 34
19954	Travelling Knight 2	3	16	12.25	45 34
19985	GCD Extreme (hard)	2	358	36.57	26 34
19991	In case of failure	3	136	40.19	34 34
19996	Moon Safari (medium)	5	83	40.94	24 34
20167	Array with Hudai Calculation	1	51	24.51	34 34
20170	Coloring Segments	5	92	20.64	31 34
20196	The Magical Bag	3	199	38.44	34 34
20562	Tracy and Charlie	1	48	56.00	17 34
20635	Dortmund Dilemma	1	22	48.33	17 34
20689	WA,RTE and Placements	1	28	41.08	34 34
20849	Interesting queries	3	46	34.12	34 34
20872	Counting Pairwise Coprime Triples	1	50	52.45	34 34
20930	Progression	4	26	8.01	34 34
20971	Alia and Substrings	-1	27	22.16	34 34
21049	Under Construction Forever	1	17	40.91	17 34
21057	Super Lucky Palindromes	3	33	27.59	34 34
21132	Palindromes	1	105	36.20	17 34
21187	Increasing Shortest Path	2	34	20.25	26 34
21418	Interesting Game with Polygons	1	36	28.02	17 34
21597	The Hack	1	21	12.94	1 34
21635	Beautiful Mountains	1	21	32.99	17 34
21644	Walls	1	25	16.92	17 34
22037	Shortest Paths	1	28	16.83	1 34
22331	Intersection Query	1	18	19.85	50 34
22554	Kingdom	1	41	45.39	34 34
22675	A conjecture of Paul Erdős (hard)	2	5	5.81	34 34
22741	Another Valentine Maze Game (2D)	2	11	21.19	50 34
22774	Help Kejriwal	2	33	53.19	17 34
23350	Mineral Farm		18	20.13	34 34
23821	Magic Schools	1	29	20.65	34 34

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