TL

------------------ DP --------------------
1887 Q_LDS
1964 最大子段和
2264 LCS 
2533 LIS

------------------ Geometry -------------------
1127 Segment rlationship Judge, DJ set
1254_Point,Angle,Line,Cross.cpp
1385 Centroid
1648 Segment Rectangle
1687 Area of Polygon
1696 Convex hull (Gift-Wrapping).cpp
2242 triangle, Circle
2546 common area of circles

------------------ Graph -------------------
1094 class Graph, topsort 
1125 Floyd
1144 Articulation point, cut_nodes 接合点，割顶.cpp
1274 Bipartite (AC 15ms)
1274 KM (AC 62ms)
1274 Network (AC 140ms)
1300 Euler Tour ( Judge ), BR
1391 class Graph, BFS 
1523_Articulation point, cut_nodes 接合点，割顶.cpp
1861_Prim_MST_print.cpp
2230_Directed_Graph's_Euler_Path_vector.cpp
2337_EulerPath.cpp
2387 Dijkstra
2394_Dijkstra_SSSP.cpp
2594_传递闭包的最小路径覆盖.cpp (Bipartite)
2838_list_bfs_CustomQueue.cpp

------------------ Java -------------------
1118 custom define array
1318 sort
1405 BigInteger
2470 BufferedReader

------------------ Math -------------------
1201_差分约束_BellmanFord.cpp
1423 Stirling
1686_Main_extends_Interpreter_Random_replaceAll.java
1704_Nim.cpp
2126 Factoring a Polynomial
2819_Taylor.cpp

------------------ Number -------------------
1006 孙子定理
1220 NUMBER BASE CONVERSION ,java file
1401 Factorial ,num of last 0 s
1595 Prime table
1702 1,3,9,27
1942 Cmn
1995 a^b % n
2539 Log to judge digits
2710 BASE 除法
2773 欧拉函数

------------------ Others -------------------
2080 Calendar
2245 next_combination
2513 DJ set,Hashtable
2799 IP

------------------ Search -------------------
1915 BFS, Queue 
2240 Hash
2263 ELFhash,Bsearch, DFS.cpp

------------------ Sort -------------------
2726 结构体二级排序

------------------ STL -------------------
1256 next_permutation,sort,cmp,string
2349 priority_queue,prim
2503 MAP
2823_deque.cpp

------------------ String -------------------
1537 regular expression
2138 Is SubString , Sort Cmp
2752 KMP

------------------ TREE -------------------
1195 树状数组 Binary indexed tree
1330 Single LCA.cpp
1442 priority_queue
1521_Huffman_priority_queue.cpp
1703 DJ set 
2255 Traversal
2299 BST (逆序数)
2352 Segment Tree
2631 树最长路 DFS

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