suggest textbook on calculus I read single variable calculus this semester, and the course is using Thomas Calculus as the textbook. But this book is just too huge, a single chapter contains 100 exercise questions! Now I'm looking for a concise and complete textbook. I'm not interested in routine, computational exercises, but rather some challenging problem sets.
I have quite a strong basic knowledge of calculus from high school, but I still have difficulties in solving a few questions from past exam papers. So I'm looking for more challenging exercises. In fact, I'm looking forward to solving Putnam level questions.
Please suggest some textbooks with these features. Thanks in advance.

Here's a new book to add to the growing list of books that handle Calculus more strictly than normal and include numerous hard problems:
https://techvoke.com/couchtuner/
https://books.google.se/books?id=HMnvCQAAQBAJ&printsec=frontcover&dq=sasane+calculus&hl=sv&sa=X&ved=0CCQQ6wEwAGoVChMIsYe1utLQyAIVJotyCh2XsQaF#v=onepage&q=sasane%20calculus&f=false
Amol Sasane's book The How and Why of One Variable Calculus was released in August 2015 by Wiley. I have attempted a newer edition of Thomas' Calculus, which I do not recommend. You won't be challenged at all because the workouts are so basic.
