Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
371	Boxes	533	35.67	1 26
374	Count maximum matrices	234	20.82	1 17
380	Bullshit Bingo	708	33.46
382	Decorate the wall	213	35.24	1 17
383	European railroad tracks	222	30.23
385	Game schedule required	148	28.71	34 1
386	Help the problem setter	97	45.82
391	Railroads	84	17.74	17 17
392	Spin	37	23.95	1 17
393	Hexagon	69	48.68	17 1
396	Hit or Miss	129	45.03	1 1
398	Roll Playing Games	117	14.15	34 17
401	Translations	131	38.11	17 34
404	Scanner	56	12.24
405	Tin Cutter	134	33.72	17 17
406	Logic	107	22.51	17 9
407	Random Number	43	27.93	17 17
412	K-path cover	181	20.04	1 50
418	Necklace	43	16.76
421	Another Road Problem	67	24.36	17 34
481	Roots of polynomial	37	24.90	17 34
484	Fossil in the Ice	434	22.09	34 17
598	Increasing Subsequences	142	34.21	34 34
677	A place for the brewery	209	27.63
682	Pairs of Integers	203	25.59
697	Matrix Words	94	26.20
700	Branch Prediction	74	18.00
702	Barn Expansion	151	23.30
729	Move your armies	77	20.04
734	Ivan and his interesting game	228	34.19
757	Thermal Luminescence	121	39.26
760	Convex Hull 3D	117	41.56
780	The Archipelago	36	42.18	45 34
827	Trigonometric optimization	77	27.87
850	Soccer Choreography	4	4.02
866	DNA Translation	117	21.59
872	Mark-up	119	29.50	34 17
900	Split Windows	31	56.90
901	Index Generation	37	53.09
903	Double Vision	64	56.49
944	Free Tour	16	3.34
972	Birthday	119	19.32
987	Mobile	70	15.53
999	Generalized Matrioshkas	412	32.54
1004	Polygon Encoder	54	9.27
1166	Dead Fraction	315	23.21	17 26
1182	Sorted bit squence	287	41.76
1267	Origin of Life	33	19.82
1269	CN Tower (Hard)	22	11.50
1270	Paint By Numbers	19	19.62