python3 -c "src='!include <iostream>\nint main(){std::cout<<42<<std::endl@}\n'
src=src.replace('!',chr(35)).replace('@',chr(59))
open('/tmp/a.cpp','w').write(src)
import os
os.system('clang++ -O3 /tmp/a.cpp -o /tmp/a')
os.system('/tmp/a')"