Steven Halim Felix Halim Suhendry Effendy <br/><br/>
Competitive Programming 4 :  The lower bound of programming contests in the 2020s : Book 1 chapter 1-4 

 - 13th 
 - 290 page 
<br/><br/><label>ISBN: </label>978-1716745522 
<br/><br/><label>Dewey Class. No.: </label>005.3  / S-82