Placement Preparatory Books

Hi, as we all know that there are many subjects like C,C++,DSC,ADA,OS,UNIX and SE on which a person has to be thorough to be able to be placed in a good company.But there are a lot many books for all of them.I just wanted to enquire that which one book, per subject you would suggest to be a 'must read'.

C -
The C Programming Language by Dennis Ritchie
Test Your C Skill by Yashavant Kanetkar
Let US C by Yashavant Kanetkar
Understanding Pointers in C by Yashavant Kanetkar

C++ -
C++: The Complete Reference by Herbert Schildt
The C++ Programming Language by Bjarne Stroustrup

DSC -
Data Structures Using C and C++ by V.Langsam, M.J.Augenstein and A.M.Tanenbaum
Data Structures and Algorithms by A.V. Aho, J.D. Ullman, J.E. Hopcroft

ADA -
Introduction to the Design and Analysis of Algorithms by Anany Levitin
Introduction to Algorithms by Thomas H. Cormen

OS -
Operating System Concepts by Silberschatz, Galvin, Gagne
Modern Operating Systems by Andrew S. Tanenbaum

Thanks a billion times