added fast_expo.cpp
Update README.md
remove .DS_Store
Merge branch 'master' of github.com:karan/Projects-Solutions
solved 4 project problems
Merge pull request #221 from iamvoid13/master

added fast_expo.cpp
Merge pull request #222 from abadojack/patch-1

Update README.md
Merge pull request #220 from vdrey/master

Added solutions for Collatz and Tile cost
Merge pull request #224 from neivin/patch-1

solved 4 project problems
Add my soluction into fibonacci
Merge pull request #225 from josenberg/master

Add my soluction into fibonacci
Add solution Cost x Tile
Add new solution for Cost x Tile in ruby
Adding solutions in Swift for first 3 questions
add more one solution for credit card in ruby
Merge pull request #226 from josenberg/master

Add new solution for 'cost per square tiles'
Solution in ruby for factorial finder
fixing some lines
Update README.md
Update README.md

Solution for Complex number algebra in python