Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
204	Sleepwalker		82	28.23
205	Icerink		6	11.27
206	Bitmap	213	7285	27.29	15 16
207	Three-coloring of binary trees	15	807	35.71	18 16
208	Store-keeper	2	98	15.69	34 34
209	The Map		217	43.14
210	The Altars		42	14.29
211	Primitivus recurencis		207	26.90
212	Water among Cubes	39	1064	28.42	23 27
215	Panic in the Plazas		77	19.50
217	Soldiers on Parade	2	120	28.62	26 17
220	Relevant Phrases of Annihilation		517	33.51
224	Vonny and her dominos	4	579	52.78	9 9
226	Jewelry and Fashion	1	17	14.74	34 50
227	Ordering the Soldiers	20	1320	34.37	19 22
228	Shamans		133	20.53
229	Sorting is easy		114	24.65
231	The Zebra Crossing		10	2.54
234	Getting Rid of the Holidays (Act I)		94	13.94
235	Very Fast Multiplication	20	936	31.41	26 22
236	Converting number formats		143	43.38
237	Sums in a Triangle	-14	3435	42.35	27 10
238	Getting Rid of the Holidays (Act II)		77	15.58
239	Tour de Byteland	1	79	24.91	17 17
241	Arranging the Blocks		52	12.95
243	Stable Marriage Problem	10	1192	45.26	17 22
245	Square Root	4	466	15.43	34 13
247	Chocolate	61	3353	48.45	10 17
260	Containers	2	269	45.69	23 17
261	Triangle Partitioning		197	59.60
262	Connections	1	96	27.29	34 34
263	Period	43	2104	44.64	11 18
264	Corporative Network	13	494	27.16	19 21
272	Cave Exploration	1	36	16.48
274	Johnny and the Watermelon Plantation		209	24.25
275	The Water Ringroad		2	12.12
277	City Game	11	1080	40.19	19 21
278	Bicycle		53	14.29
279	Interesting number	24	732	24.39	18 25
280	Lifts		42	18.94
283	Naptime		162	37.33
286	Selfish Cities	1	656	40.45	34 34
287	Smart Network Administrator	3	400	26.50	24 31
288	Prime or Not	48	3198	19.01	22 21
290	Polynomial Equations		55	21.52
291	Cube Root	1	229	16.56	26 13
292	Alibaba	1	154	22.79
293	Officers on the Beat		8	7.04
296	Teamwork is Crucial		66	30.77
297	Aggressive cows	783	17771	37.83	16 22

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