Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
3388	Double Near Palindromes	1	452	34.14	17 17
3389	The Knights of the Round Circle	3	449	67.36	6 23
3390	Tribe Council	1	59	20.65	34 34
3393	Knot or Not		7	13.85
3394	Lagrange’s Four-Square Theorem	4	531	46.04	1 9
3405	Almost Shortest Path	79	1684	31.23	22 21
3406	Bases		68	20.57
3407	Candy	31	1361	42.56	12 20
3408	DNA Sequences	47	1987	26.10	16 20
3409	Electricity	2	807	47.77	5 1
3410	Feynman	122	34369	57.48	4 6
3411	Pole Position	2	916	47.36	8 8
3412	Higgs Boson		49	18.52
3413	Traveling Shoemaker Problem	2	73	16.87	28 17
3414	Bora Bora		144	49.01	34 26
3415	Shrinking Polygons		232	18.97
3420	Falling Ice		7	24.14
3426	Ouroboros Snake	2	82	52.12	26 34
3436	Histogram	44	1522	44.34	19 22
3442	The last digit	190	29852	26.92	9 8
3459	SkyScrapers	3	360	38.60	17 17
3461	Song Contest		12	14.29
3462	The Skatepark´s New Ramps		9	22.22
3463	Robintron		6	22.22
3464	Clock	3	59	37.78	34 9
3465	Drive through MegaCity		21	23.23
3466	Another Longest Common Subsequence Problem		6	25.00
3476	Deposit	2	232	38.34	17 21
3477	Baby	28	951	46.59	21 24
3482	Alias		5	62.50
3483	Begin		4	10.75
3484	Crossbits	3	98	15.43	23 15
3485	Disputes	1	83	63.23
3486	Elimination		70	29.17
3488	The Top-Code	1	55	20.19	17 34
3490	Hidden Triangle		10	29.09
3492	Braille Transcription		16	14.33	17 17
3495	The Nobel Thief		10	48.00
3505	Prime Number Theorem	25	1532	28.10	14 13
3533	Game on board		28	36.73
3543	Matrica		53	39.38
3544	Binary Search Tree	6	600	20.87	11 20
3545	Najkraci	6	185	28.91	28 34
3565	Choosing Gloves	3	84	22.88	17 34
3576	Boy Scouts	3	141	27.79	21 30
3577	Parity	3	79	19.76	17 34
3578	Hashing	1	39	11.75	34 34
3579	Disjoint Paths	4	312	20.64	24 27
3581	Tree Similarity	1	26	48.13	34 34
3582	Restaurant Tab		24	26.47

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