Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	CODE	USERS	ACC %
1	Life, the Universe, and Everything	TEST	14474	39.81
2	Prime Generator	PRIME1	3771	15.77
3	Substring Check (Bug Funny)	SBSTR1	179	12.98
4	Transform the Expression	ONP	3678	51.99
5	The Next Palindrome	PALIN	2377	17.44
6	Simple Arithmetics	ARITH	634	16.15
7	The Bulk!	BULK	145	31.97
8	Complete the Sequence!	CMPLS	627	36.33
9	Direct Visibility	DIRVS	104	22.77
10	Complicated Expressions	CMEXPR	304	30.10
11	Factorial	FCTRL	4965	49.16
12	The Game of Master-Mind	MMIND	98	50.12
13	Hotline	HOTLINE	85	42.65
14	I-Keyboard	IKEYB	325	40.52
15	The Shortest Path	SHPATH	597	16.63
16	Sphere in a tetrahedron	TETRA	359	43.86
17	The Bytelandian Cryptographer (Act I)	CRYPTO1	265	32.81
18	The Bytelandian Cryptographer (Act II)	CRYPTO2	351	39.19
19	The Bytelandian Cryptographer (Act III)	CRYPTO3	67	42.78
20	The Bytelandian Cryptographer (Act IV)	CRYPTO4	16	6.63
22	Triangle From Centroid	TRICENTR	376	36.75
23	Pyramids	PIR	885	39.73
24	Small factorials	FCTRL2	4210	39.28
25	Pouring water	POUR1	515	17.18
26	Build the Fence	BSHEEP	401	28.83
27	Sorting Bank Accounts	SBANK	1093	30.42
28	Help the Military Recruitment Office!	HMRO	249	13.00
29	Hash it!	HASHIT	715	25.37
30	Bytelandian Blingors Network	BLINNET	515	28.88
31	Fast Multiplication	MUL	283	11.86
32	A Needle in the Haystack	NHAY	772	40.00
33	Trip	TRIP	338	22.07
34	Run Away	RUNAWAY	115	31.57
35	Equipment Box	EQBOX	363	16.31
36	Secret Code	CODE1	108	30.53
37	The Proper Key	PROPKEY	91	30.23
38	Labyrinth	LABYR1	836	25.95
39	Piggy-Bank	PIGBANK	1078	35.32
40	Lifting the Stone	STONE	434	21.72
41	Play on Words	WORDS1	764	22.17
42	Adding Reversed Numbers	ADDREV	5228	52.73
43	Copying Books	BOOKS1	492	25.80
44	Substitution Cipher	SCYPHER	154	16.21
45	Commedia dell Arte	COMMEDIA	104	47.24
47	Skyscraper Floors	SCRAPER	144	17.25
48	Glass Beads	BEADS	747	43.80
49	Hares and Foxes	HAREFOX	58	25.58
50	Invitation Cards	INCARDS	280	45.53
51	Fake tournament	TOUR	257	19.85
54	Julka	JULKA	2775	35.80