Sphere Online Judge (SPOJ)

ID	NAME	QUALITY	USERS	DIFFICULTY C I
30785	Ada and Apple	12	166	30 25
32952	Ada and Football	2	172	50 42
32223	Ada and Lychees	3	14	42 26
28449	Ada and List	10	303	14 17
32856	Ada and Contact	1	25
30760	Ada and Travelling Salesman	18	174	23 29
15454	How to Handle the Fans	38	1498	11 11
5832	AND Rounds	51	1684	17 20
27379	Unique Code	21	122	20 20
61	Brackets	174	5343	19 20
14742	Building Bridges(HARD)	10	444	14 17
6168	Building Bridges	27	1624	11 17
23742	Dolan and Nephews	5	48	30 27
33019	Catering Contracts	7	86	23 27
12563	Halt The War	8	378	19 19
13015	Counting Primes	32	1264	16 14
7296	Trees Again	5	166	21 30
9722	Insertion Sort	28	3760	12 12
5296	Air Combat	-1	64	34
10628	Count on a tree	61	2185	32 32
10707	Count on a tree II	62	2591	31 31
11414	Combat on a tree	2	206	30 34
11482	Count on a trie		44	42 50
16245	Living with Courage	18	563	9 13
1108	Card Trick	67	2154	21 24
10810	Its a Murder!	53	2338	15 16
3978	Distance Query	67	1577	24 21
3267	D-query	446	11815	19 23
9577	Dynamic Tree Connectivity	12	494	29 28
1684	Frequent values	111	3675	20 21
18185	Give Away	31	942	20 18
11985	Gao on a tree	25	666	27 27
12005	Grass Planting	8	460	34 17
1043	Can you answer these queries I	562	12996	25 24
1557	Can you answer these queries II	23	1426	30 36
1716	Can you answer these queries III	228	10303	22 21
2713	Can you answer these queries IV	59	3448	21 21
2916	Can you answer these queries V	51	2455	23 23
4487	Can you answer these queries VI	25	1161	34 28
6779	Can you answer these queries VII	16	1050	39 28
19543	Can you answer these queries VIII	8	172	37 35
132	Help R2-D2!	12	753	19 16
12210	High and Low		61
8002	Horrible Queries	393	10575	19 18
18247	Arrangement Validity	11	209	17 21
18248	Maggu’s Solar Panels	1	43	34 34
26721	I LOVE Kd-TREES III	4	78	34 34
37375	Kingdom of Equality	2	12	26 26
3693	Maximum Sum	57	6286	19 18
8985	Line up	19	384	16 17

#tree

Tree is a data structure that simulates a hierarchical tree structure

https://en.wikipedia.org/wiki/Tree_(data_structure) https://en.wikibooks.org/wiki/Data_Structures/Trees http://www.i-programmer.info/babbages-bag/477-trees.html