If you are stuck, look at the first step of the solution, then try to finish the rest on your own.
When searching for the keyword , you will likely encounter the term "repack" on various educational forums, torrent sites, or PDF repositories. solution manual for coding theory san ling repack
If a specific explanation in San Ling's book is confusing, cross-reference it with The Theory of Error-Correcting Codes by MacWilliams and Sloane, or Essential Coding Theory by Guruswami, Rudra, and Sudan. If you are stuck, look at the first