Books and Resources on Combinatorics for RMO

Level 0

  1. Mathematical Circle; Russian Experience  by Fomin
  2. Mathematics can be fun by Perelman
  3. Elementary Algebra by Hall and Knight

Level 1

  1. Higher Algebra by Hall and Knight
  2. Challenges and Thrills of Pre College Mathematics

Level 2

  1. Excursion in Mathematics by Bhaskaracharya Pratisthana
  2. Problem Solving Strategies by Arthur Engel
  3. Principles and Techniques in Combinatorics by Chi Chuan

Level 3

  1. IMO Compendium
  2. Graph Theory by Harary
  3. Combinatorics by Brualdi