Index By Type

ID	Type	ID	Type
1	BigNums	2	Combinatorics
3	Computational Geometry	4	Data Structure - Segment Tree
5	Data Structure - Dancing Links	6	Data Structure - Keyword Tree
7	Data Structure - LCA	8	Data Structure - Others
9	Data Structure - Suffix Array（Suffix Tree）	10	Deduce
11	Discretize	12	Dynamic Programming
13	Expectation	14	Game Theory
15	Graph Theory - Union-Find Sets	16	Graph Theory - Assignment Problem
17	Graph Theory - Match	18	Graph Theory - Minimum Spanning Tree
19	Graph Theory - Network Flow	20	Graph Theory - Others
21	Graph Theory - Shortest Path	22	Greedy
23	Hash	24	Introduction
25	KMP	26	Math
27	Math Theory	28	Matrix
29	Non-Mainstream	30	Oh My God（who can solve these problems?）
31	Search	32	Simulation
33	Sorting	34	Water~~~

HDOJ Problem Index by Type