Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
37422	Recurrence Power Sum	4	28	19.10	45 46
40501	A Simple Sieve	3	7	9.09	45 50
12076	Longest Common Subsequence	6	140	4.57	45 45
33046	Factorial Modulo Prime	4	31	17.53	46 42
16063	Hackers	6	61	21.82	48 48
73	Bacterial	1	75	18.71	50 17
177	AB-words	1	16	1.22	50 50
1473	Lemon Tree in the Moonlight		27	19.21	50 34
1726	Exchange		23	7.67	50 34
2161	Pixel Shuffle		33	20.72	50 17
2902	Candy IV		33	46.46	50 34
2946	Eclipse	1	24	10.25	50 50
3948	Polynomial Evaluation - Angry Teacher	-1	31	15.10	50 50
4100	Sum of Vectors	-1	102	29.34	50 34
4189	Landing	1	6	3.16	50 50
4569	Let go to the movies	-3	160	18.20	50 34
5157	Game Simulator	1	23	9.13	50 17
5638	Mobile Service Hard	1	88	22.41	50 50
6408	Counting Triangles 2	-1	66	34.40	50 50
7192	Integral Maximization	1	372	38.21	50 50
7565	Another Sorting Algorithm	1	31	14.41	50 1
7583	Cubic Eight-Puzzle	1	30	31.13	50 34
8265	Zero Count	1	15	12.03	50 17
8283	Non-Decreasing Numbers	2	29	19.70	50 50
8318	color the balls		69	42.80	50 50
9519	Distinct Submatrices	1	23	12.73	50 50
9543	Dynamic Congruence Equation System		10	59.29	50 50
9638	Circuits		23	8.61	50 34
9889	Movie collection	1	215	43.63	50 50
9950	IQ Team	1	42	42.40	50 50
11756	Teaming up for the competition	1	34	33.77	50 50
11830	DOJO Corridor I	-1	31	31.46	50 34
12803	Graph		8	15.00	50 50
12804	Spy	1	6	13.33	50 50
13094	Beggars		48	27.62	50 50
13223	The BrainFast Processing! Classical version		9	38.75	50 17
13591	Factor y Hell		9	18.64	50 34
13809	ISRANK	1	21	34.13	50 50
13940	Fibonacci vs Polynomial (HARD)	4	20	23.81	50 50
15257	Partition function (HARD)	1	6	2.80	50 42
15382	Factorial (Again!)		4	35.64	50 1
17396	Dazzling Pearls		18	16.67	50 17
17402	Joy of Arbitrage	1	18	16.30	50 34
18915	Anils Proposal	2	30	18.58	50 50
19133	Base Conversion	1	9	12.72	50 34
20327	Triangles	1	29	28.40	50 50
21061	Yet Another Subset Sum Problem	2	45	33.19	50 50
21395	Ohani And Binary Search Tree	-1	129	36.01	50 17
22090	Prime Power Test (Hard)		11	20.21	50 50
22331	Intersection Query	1	18	19.85	50 34

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