Computer science textbooks and exercise solutions
I noticed that many computer science textbooks do not have solutions to exercises in the back of the book.  This is not like math books, which usually have solutions to odd numbered exercises.  This is very inconvenient since I usually like to check my answers if I work on practice problems.  

Are there any online websites where people pool solutions to computer science textbooks?  How do other people deal with this issue?   What is the reasoning behind the authors not placing some solutions in the back of the book (while math book authors don't seem to mind)?
Computer science textbooks and exercise solutions
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I noticed that many computer science textbooks do not have solutions to exercises in the back of the book.  This is not like math books, which usually have solutions to odd numbered exercises.  This is very inconvenient since I usually like to check my answers if I work on practice problems.  

Are there any online websites where people pool solutions to computer science textbooks?  How do other people deal with this issue?   What is the reasoning behind the authors not placing some solutions in the back of the book (while math book authors don't seem to mind)?