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	76.49	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
6338	Monster		46	51.28
315	The Secret Fellowship of Byteland		45	67.98
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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