Data Structures
Arrays [507]
Strings [344]
Tree [150]
Hash [133]
Matrix [98]
Graph [73]
Stack [55]
Queue [33]
Heap [26]
Map [25]
Trie [7]

Algorithms
Sorting [115]
Bit Magic [109]
Numbers [48]
Greedy [44]
DFS [32]
sieve [31]
series [30]

Languages
Java [510]
CPP [195]
C [95]
SQL [62]
CSharp [19]
PHP [7]
HTML [5]
XML [4]
Perl [1]

Others
Puzzles [63]
Misc [61]
STL [46]
Linux [40]
memory [10]
Hadoop [6]
Spring [6]
UML [1]