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Solving your first problem in C on CodeChef: https://www.youtube.com/watch?v=qM-TzG3dkcc
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http://www.iitk.ac.in/esc101/current/index.html (Do see the Assignments section for possible questions along with solutions), Also see the archive section.
Books
- The C Programming Language", Kernighan & Ritchi
- “Programming in C and Data Structures”, Hanly-Koffman-Kamthane-Rao, Pearson