Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
10701	The Lazy Gamer		16	13.61
4188	Amazing equality		38	13.58
44	Substitution Cipher	2	325	13.57	17 17
3393	Knot or Not		6	13.56
3762	Bread Tree		162	13.54
14823	Advanced Battleships	5	50	13.53	23 23
2678	Closest distance	1	159	13.50	28 34
1326	A Chase In WonderLand	2	405	13.49	6 1
7629	Building Ports		43	13.48
18530	Font Size	7	200	13.46	15 5
2371	Another Longest Increasing Subsequence Problem	16	797	13.46	29 33
2648	Archiver	1	44	13.46	34 50
2323	Broken Compass		41	13.42
23539	Split	3	30	13.38	17 17
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
30452	Moumita and Assignments	5	67	13.27	21 21
40643	The Revenge Of Anti Hash	1	12	13.27	34 34
5014	Crazy Receptionist		11	13.18
9685	Zombie’s Treasure Chest	2	75	13.16	9 17
11851	Power with Combinatorics(HARD)	1	128	13.13	34 42
18522	Tours		22	13.10	42 26
278	Bicycle		56	13.08	34 1
5155	Exciting Time		40	13.06
241	Arranging the Blocks		52	13.04
26772	Lets Be An Anagrammatist	5	33	13.02	26 21
2271	Undecodable Codes		46	13.01
6720	Paper Fold		19	13.01
245	Square Root	4	575	12.97	20 10
30828	Class Leader	3	192	12.94	23 28
25810	Divisibility Test	10	57	12.93	24 26
15328	Hunter x Hunter	-1	71	12.91	1 17
20926	Special Numbers (Reverse and Add)	1	21	12.83	26 26
5158	Heroes Arrangement		12	12.80
205	Icerink		8	12.79
47	Skyscraper Floors	7	286	12.76	23 20
15360	World Record Lunch		24	12.76
32567	First to meet the spaceship	1	31	12.76	34 17
327	Platon and Socrates		50	12.75	9 34
1526	Ranklist Sorting	1	23	12.75	17 34
14929	Subsequence	2	173	12.74	10 15
9508	Magic Bitwise AND Operation		104	12.72
32029	Ada and Connections	6	69	12.72	24 24
188	Rectangles	2	182	12.71	17 23
1784	IOICamp Sequence	1	318	12.68	1 17
10082	Comparing Answers		58	12.67
31036	Ada and Mulberry	5	113	12.65	27 24
13801	Dexter Rank	1	9	12.64	34 34

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