Data Structures
Arrays [456]
Strings [333]
Tree [138]
Hash [109]
Matrix [86]
Graph [62]
Stack [45]
Queue [22]
Heap [19]
Map [16]
Trie [7]

Algorithms
Sorting [92]
Numbers [47]
Greedy [45]
series [28]
DFS [26]

Languages
Java [509]
CPP [194]
C [95]
SQL [62]
CSharp [19]
PHP [7]
HTML [5]
XML [4]
Perl [1]

Others
Puzzles [63]
Misc [59]
STL [45]
Linux [40]
python [14]
Hadoop [6]
Spring [6]
hive [2]
subset [2]