Data Structures
Arrays [500]
Strings [335]
Tree [139]
Hash [116]
Matrix [90]
Graph [63]
Stack [50]
Queue [27]
Map [25]
Heap [19]
Trie [7]

Algorithms
Bit Magic [100]
Sorting [100]
Numbers [48]
series [29]
DFS [26]

Languages
Java [510]
CPP [194]
C [95]
SQL [62]
CSharp [19]
PHP [7]
HTML [5]
XML [4]
Perl [1]

Others
Puzzles [63]
Misc [61]
STL [45]
Linux [40]
set [7]
Hadoop [6]
Spring [6]
UML [1]
parser [1]