>>346
Hi, hope everyone is well. I'm looking for "topics in functional equations" and "graphs an introduction" by Titu Andreescu, and a collection of all the introductory and intermediate books published by AOPS, since I need them to prepare for the math olympiad. I've looked on irc, libgen, anna's archive, zlib and some ddl forums. can someone help this frog out? thanks. 
PS: I found a few AOPS books on anna's archive but they're incomplete and unorganized, and they cost a soykaf ton for me(18k in my currency for 1 book). Would really appreciate a complete and organized collection. I've not looked at MaM, bibliotik, libraries(my country doesn't have any) or other places, since I don't have access.