https://swexpertacademy.com/main/code/problem/problemDetail.do?contestProbId=AV15Khn6AN0CFAYD&categoryId=AV15Khn6AN0CFAYD&categoryType=CODE&problemTitle=&orderBy=RECOMMEND_COUNT&selectCodeLang=ALL&select-1=&pageSize=10&pageIndex=1
정답유튜브 강의..
https://www.youtube.com/watch?v=vGU8h1rneGw&t=634s