SCTF is a CTF contest hold by XCTF ( seems like a Chinese version's CTFtime.org ). Teaming up with my labmates, we have a lot of fun solving the challenges, and scored 2161 pts with the final rank 13/659.
Code400 gave us a python script
Similar with Pwn200, Pwn400 gave us a binary file, but no libc.so. Open it with IDA Pro and analyze it, we found some information: