The art of Problem Solving

[constant]

Здравствуйте, прошу помощи в поиске серии книг The art of Problem Solving, особенно интересуют:
The Art of Problem Solving, Vol. 1: The Basics by Sandor Lehoczky, Richard Rusczyk
Introduction to Counting & Probability David Patrick

[Nemiroff]

На либгене есть.

[Aritaborian]

The Art of Problem Solving, Vol. 1.
Introduction to Counting & Probability.