Sphere Online Judge (SPOJ)

list of basics problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
26246	Strange But Easy	3	348	37.22	6 6
26780	GORDON AND GALLERY	3	81	21.01	1 9
36131	Sieve of Sundaram	3	63	44.72	1 1
41070	Bas1c and the game of sum	3	130	86.25	17 13
12177	Character Patterns (Act 2)	4	7930	48.26	1 1
12188	Character Patterns (Act 7)	4	929	43.69	10 8
16934	Straight Line Spiral Pattern (Act 2)	4	210	66.87	12 6
17102	Fun with Sequences	4	3464	41.27	1 1
17104	Fun with Sequences (Act 3)	4	1992	44.79	1 1
17126	Fun with Sequences (Act 4)	4	1009	52.80	4 1
17994	Cross Pattern (Act 1)	4	1112	51.94	1 1
40506	Eratosthenes Prime numbers	4	129	38.51	9 9
12176	Character Patterns (Act 1)	5	11593	41.72	5 5
28270	Team Building	5	147	19.19	9 21
28587	A problem of Backtracking	5	531	29.19	6 12
31278	Can you search?	5	153	19.92	12 15
12026	Test 1	6	27337	45.43	3 3
12180	Character Patterns (Act 4)	6	3485	65.74	6 5
15710	Iterated sums	6	6533	53.25	1 1
15711	Wow	6	8996	50.23	1 1
12205	Minimum Bounding Rectangle	7	1464	62.23	7 5
15709	Two Circles	7	1481	24.48	3 5
2135	SPOJ Custom Test	9	10586	44.69	32 32
12156	Half of the half	10	13147	31.44	3 2
12178	Character Patterns (Act 3)	10	5106	55.32	5 6
12206	Hidden Password	10	828	37.93	11 6
29154	SUM OF DIGITS	11	3564	30.74	4 4
30754	Ada and Behives	11	272	45.02	12 16
15708	Divisibility	13	7669	51.76	4 3
34483	Connected country	14	538	39.45	6 4