CTFtime.org / 0CTF/TCTF 2020 Quals / Happy Tree / Writeup

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[https://hxp.io/blog/74/0CTF-2020-writeups/#happy-tree](https://hxp.io/blog/74/0CTF-2020-writeups/#happy-tree)

Original writeup (https://hxp.io/blog/74/0CTF-2020-writeups/#happy-tree).