Source

Following publishers are major sources of problems here, most hints and solutions are my own.
  1. The international mathematical olympiad
  2. problems corner.org( founded by MathPro and the Department of mathematical and Staistics of the university of Missouri- Rolla
  3. the Canadian mathematical society (Crux Mathematicorum  with Mayhem)
  4. KAIST(Korea Advanced Institute of Science and Technology) ,Marthematical problem solving Group
  5. The IMO compendium (A collection of problems suggested for the IMO, 1959~2004.)
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