Sphere Online Judge (SPOJ)

list of challenge problems

ID	NAME	CODE	USERS	ACC %
53	Kamil	KAMIL	3440	50.26
72	Food Shortage in Byteland	BYTEFOOD	212	57.55
126	Solovay-Strassen Inverted	SOLSTRAS	86	57.26
127	Johnny Goes Shopping	JOHNNY	781	65.94
155	Solving the Puzzle	SOLVING	10	6.97
218	Points on a Sphere	PSPHERE	137	65.72
219	Pawns Gone Wild	PAWNS	21	53.90
222	The Burning City	BURNCITY	87	57.96
225	Nightmare in the Towers of Hanoi	HANOI	17	35.90
232	Bytelandian Telecom	BYTELE	58	65.40
240	Santa Claus and the Presents	SANTA	81	75.21
246	Plant a Christmas Tree	CTQUINE	84	49.50
270	Digits of Pi	PIVAL	3115	65.57
273	The Modern Dress Code	DCODE	70	70.81
276	Herdkeeper	MFENCE	44	70.62
285	Atomic Shelters	ATSHELT	94	66.22
289	The Turing Music Box	TMBOX	106	93.90
294	Johnny and the Optimisation of Homework	HWORK	13	46.70
295	Bytelandian Origami	BRIGAMI	26	78.34
298	Closing down Railway Lines	DERAIL	24	63.16
313	The Game of Crosses & Crosses	CROSSES	53	81.58
314	Digits of e	EVAL	1534	67.81
315	The Secret Fellowship of Byteland	BFORG	61	72.83
316	Japan Crossword	JCROSS	55	59.55
317	Simple Image Recognition	IMGREC1	242	73.22
321	X-Words	XWORDS	13	57.20
326	Enjoying a Multiplayer Game	MGAME	16	75.73
353	Displace	DISPLACE	37	54.18
356	Tethering the Mammoths	MAMMOTH	10	68.75
378	Size Contest	SIZECON	5542	51.79
525	Fractions Calculator	TFRACAL2	45	43.28
528	Shortest Superstring	TSSTR	96	51.97
755	Rectangles in a Square	RIS	29	64.49
756	Literature List	LIB	56	67.36
758	Tetris AI	TTR	67	77.54
759	Hard Image Recognition	HIR	22	91.95
761	Minesweeper	MSWP	46	49.09
853	Delivery plan	DELIVERY	48	82.64
919	Prime checker	PRIC	1092	72.65
1414	SuDoku Puzzle	SUD	295	54.35
1416	Electrification	ELC	41	58.49
1422	Digital Image Processing	DIP	90	76.38
1423	Digits of SQRT(2)	SQRT2	1418	65.25
1481	Yet another computer network problem	PT07E	24	69.91
1492	Lexicographic sort	SLEXSORT	202	53.16
1558	Math II	MATH2	26	68.25
1690	Intercept	INTER	34	31.54
1711	Greatest Common Divisor	GCD	77	37.80
1742	Brainf_ck	BRAINF_K	70	39.26
2004	Analyse Simple Arithmetical Expressions	EXPR2	511	51.68