Sphere Online Judge (SPOJ)

list of challenge problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
246	Plant a Christmas Tree		88	43.20
2624	JawBreaker Game	1	86	61.16	26 26
3099	Super Quine	1	84	19.38
13929	Matrix Exponentiation	2	83	50.66	23 23
11849	A Very Easy Problem! (Challenge Mode)	2	80	50.79	42 9
289	The Turing Music Box		73	68.95
758	Tetris AI		73	77.83
17820	Guess The Number With Lies v5	1	72	72.66	50 50
11719	The dojo s corridor	2	71	64.41	26 34
1742	Brainf_ck		70	36.24
2659	Carl		70	39.22
2471	Magic Program II	1	68	35.65	17 17
17308	Guess The Number With Lies v2		68	54.30
756	Literature List		65	68.30
10295	HQNP Incomputable Hard	3	61	76.46	21 38
13016	"If Equal" in BF		57	51.71
8405	Printf Parser		55	53.73	9 9
11451	Aritho-geometric Series (AGS) (Challenge)	1	55	47.17	17 17
16509	Divisors	1	55	61.23	1 34
18931	Sum of primes	4	55	25.24	23 28
525	Fractions Calculator		53	41.53
18073	Colour Brick Game		53	88.66
7965	The Electronic Dice	1	52	54.03	34 17
11793	Cartesian Shortest Path		52	44.15
276	Herdkeeper		50	68.27
761	Minesweeper		50	40.38
20651	Reliability of Logic Circuits		49	66.56	50 50
26800	Lawnmower	1	49	66.11	17 1
315	The Secret Fellowship of Byteland	1	46	70.40	34 34
6338	Monster		46	51.28
18901	The Secret Recipe		45	77.84
8950	Grid points		44	57.73
222	The Burning City		43	58.65
353	Displace	1	43	47.08	34 17
232	Bytelandian Telecom		42	68.25
1690	Intercept		42	31.73
11815	Tiling a WxH Grid With Dominoes		41	54.16	34 17
2629	Robo Eye	1	39	78.03	34 34
19206	Power Sum		39	52.92
1558	Math II		36	73.24
1416	Electrification		35	38.19
6877	Terminating or Non-Terminating		34	43.41	17 17
11689	Real Roots	1	34	94.29	50 50
27840	Seedlings		34	74.92
755	Rectangles in a Square	1	31	63.51	17 34
8733	Summing up Last digits		31	72.01
17257	Guess The Number With Lies v1		31	47.29
27841	Sabotage	2	30	56.37	34 34
295	Bytelandian Origami	1	27	61.84	17 34
313	The Game of Crosses & Crosses		26	75.52

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