Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
3393	Knot or Not		6	13.56
2678	Closest distance	1	159	13.52	28 34
44	Substitution Cipher	2	319	13.50	17 17
3762	Bread Tree		161	13.50
7629	Building Ports		43	13.48
2323	Broken Compass		41	13.47
2648	Archiver	1	44	13.46	34 50
1326	A Chase In WonderLand	2	402	13.44	9 1
14823	Advanced Battleships	5	49	13.42	23 23
18530	Font Size	7	199	13.41	15 5
21858	Christmas is coming	2	27	13.38	42 26
10822	The Prime Minister	1	26	13.35
15435	Schedules		23	13.33
3972	Stargates		45	13.29
2371	Another Longest Increasing Subsequence Problem	15	765	13.24	29 33
5155	Exciting Time		39	13.19
5014	Crazy Receptionist		11	13.18
35337	Faketorial Hashing	1	10	13.16	34 34
11851	Power with Combinatorics(HARD)	1	127	13.10	34 42
18522	Tours		22	13.10	42 26
245	Square Root	4	564	13.04	20 10
241	Arranging the Blocks		52	13.04
278	Bicycle		55	13.03	34 1
13420	Fimodacci	3	36	13.03	12 26
26772	Lets Be An Anagrammatist	5	33	13.02	26 21
2271	Undecodable Codes		46	13.01
6720	Paper Fold		19	13.01
146	Fast Multiplication Again		36	12.95
205	Icerink		8	12.94
25810	Divisibility Test	10	57	12.93	24 26
15328	Hunter x Hunter	-1	71	12.91	1 17
9685	Zombie’s Treasure Chest	2	74	12.90	9 17
20926	Special Numbers (Reverse and Add)	1	21	12.83	26 26
188	Rectangles	2	181	12.81	17 23
5158	Heroes Arrangement		12	12.80
30828	Class Leader	3	182	12.79	23 28
15360	World Record Lunch		24	12.76
32567	First to meet the spaceship	1	31	12.76	34 17
1526	Ranklist Sorting	1	23	12.75	17 34
1784	IOICamp Sequence	1	318	12.73	1 17
9508	Magic Bitwise AND Operation		104	12.72
32029	Ada and Connections	6	69	12.72	24 24
14929	Subsequence	3	172	12.71	9 15
47	Skyscraper Floors	5	281	12.65	26 17
13801	Dexter Rank	1	9	12.64	34 34
327	Platon and Socrates		49	12.64	9 34
10800	GAME		21	12.64
12210	High and Low		61	12.63
31036	Ada and Mulberry	4	112	12.63	26 26
10082	Comparing Answers		57	12.59

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