Standard Template Library (STL)

STL has four components - 

1. Functor
2. Algorithm Functions
3. Iterators
4. Containers

1. Functor : 

• Go through this link.

2. Algorithm Functions :

• Go through this link and this link.
  

3.  Iterators :

• Go through this link.

4. Containers :

• Go through this link.

Utility Library :

• Pair - Link

Extra :

• Bit-set - Link
  
• String - Link
  
• String Stream - Link
  
• PBDS - Link1 Link2