Sphere Online Judge (SPOJ)

list of challenge problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
4760	Primes in Brainf##k	2	139	66.30	17 6
4246	Place the Numbers II	1	540	66.32	1 1
4163	Relative Board		6	38.10
3947	Brainf F##k Writing	9	1497	74.45	23 3
3880	Nop	1	607	49.87	1 1
3099	Super Quine	1	84	19.38
2824	Glenbow Museum		3	33.33
2732	Attack A Single Test File!	1	3	40.74	34 34
2729	Discover		2	8.20
2659	Carl		70	39.22
2629	Robo Eye	1	39	78.03	34 34
2628	Markov Algorithm		116	49.13
2624	JawBreaker Game	1	86	61.16	26 26
2471	Magic Program II	1	68	35.65	17 17
2004	Analyse Simple Arithmetical Expressions	1	724	51.31	17 1
1742	Brainf_ck		70	36.24
1711	Greatest Common Divisor		108	31.68
1690	Intercept		42	31.73
1558	Math II		36	73.24
1492	Lexicographic sort	4	466	50.95	17 9
1481	Yet another computer network problem		23	66.75	34
1423	Digits of SQRT(2)	6	2737	67.39	11 11
1422	Digital Image Processing	2	121	74.53	34 34
1416	Electrification		35	38.19
1414	SuDoku Puzzle	5	432	53.73	30 21
919	Prime checker	10	1620	65.43	15 28
761	Minesweeper		50	40.38
759	Hard Image Recognition		17	67.97
758	Tetris AI		73	77.83
756	Literature List		65	68.30
755	Rectangles in a Square	1	31	63.51	17 34
528	Shortest Superstring	4	174	48.18	28 34
525	Fractions Calculator		53	41.53
378	Size Contest	21	10753	55.90	6 1
356	Tethering the Mammoths		12	80.98
353	Displace	1	43	47.08	34 17
326	Enjoying a Multiplayer Game		18	71.32
321	X-Words	1	19	64.46	34 17
317	Simple Image Recognition	3	317	72.56	17 26
316	Japan Crossword		159	68.28
315	The Secret Fellowship of Byteland		46	68.14
314	Digits of e	5	2997	59.55	3 3
313	The Game of Crosses & Crosses		26	75.52
298	Closing down Railway Lines	3	131	83.37	26 17
295	Bytelandian Origami	1	27	61.84	17 34
294	Johnny and the Optimisation of Homework		16	45.43
289	The Turing Music Box		73	68.95
285	Atomic Shelters	1	121	63.05	17 17
276	Herdkeeper		50	68.27
270	Digits of Pi	13	5871	71.27	9 19

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