Useful Links for Algorithms and Puzzles

Coding Contest :

1>Code Chef : Initiative of Directi
2>AI challenge : http://aichallenge.org/problem_description.php
3>ML coding contest : http://www.kaggle.com/ [Best]
4>Heritage Health Prize :  Data analysis contest http://www.heritagehealthprize.com/c/hhp


Algorithms :

1>Carrer Cup [Blog /Pdf]
2>Geek for geeks [best]
3>Crack The Interview [Pdf]
4>Freshers world

Puzzles :
1>Gurmeet singh puzzles :Delightful Puzzles
2>Cracking the code : http://shashank7s.blogspot.com/p/stacks.html