please someone suggest me some good data structure books…so that i can implement it efficiently in the contest i want to learn more about hashing ,priorty queues and some useful data structures
Data Structure using C and C++ by Aaron M. Tenenbaum is a nice book to start with.
Section III and V in this book might help you !
In addition to the above mentioned books, these books are really useful:
1)C++ Data structures by Nell Dale.
2)Data Structures and Algorithms by Alfred Aho.
3)Data Structures and Algorithms in Java by Mitchel Waite.
If you want to learn data structures from the very basic i would recommend data structures by yashwant kanetkar .
a big NO to this book!