Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
41128	Pierwiastkowanie	4	40	39.50	5 13
41212	Bankomat	2	36	39.45	1 1
41213	Diamond Collector	2	29	45.71	6 12
41215	Diamonds		26	15.66
41374	Digit Shifts	1	18	7.60	34 23
41455	....	1	11	14.55	17 17
41507	GCD Product Sum	8	52	31.17	9 21
41657	GCD Goodness	2	30	30.62	17 26
41790	Spy Reloaded		6	8.43
41823	Martia Auris 3020		8	45.83
41834	Anagrams and GCD		10	6.08
41890	Anagrams and Divisibility	1	9	5.17	34 34
41944	BitPlay69	6	279	31.14	27 27
42049	Maximum Sum of the Array	2	117	8.85	1 3
42340	Bracket Check	4	261	32.93	3 1
42487	The 3n + 1 problem	1	69	27.22	8 4
42488	Minesweeper		48	29.63	1 1
42526	Village Unity	1	6	9.72
42529	Robert Plays The Viola	3	39	45.54	4 8
42535	Hugo"s Tennis Training	4	46	48.54	1 5
42546	Hu-Gi-Oh	2	45	37.31	1 1
42570	Big J Walks Around the school	-1	12	62.50	1 1
42571	Russian Year 5 Problem		7	14.29
42573	Seating Plan	1	5	42.31	17 17