This book provides a widespread mix of exercises on different topics. Some puzzles may not be of direct, practical importance, but indirectly they help improve your creativity and your ability to find solutions.
In addition to exercises and documented solutions, each topic covered in the book starts with a short introduction. You can use the introductions to get up to speed with the exercises to about the level of difficulty. In each subject area, there are always a few easier exercises to get you started. With a little practice, you should also be able to tackle more difficult problems. Occasionally there are some really challenging exercises, which experts can try their hand at (or those who want to become experts).
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