/in/foo.cc:8:11: error: 'LL' was not declared in this scope
 LLL exgcd(LL a,LL b)
           ^~
/in/foo.cc:8:16: error: 'LL' was not declared in this scope
 LLL exgcd(LL a,LL b)
                ^~
/in/foo.cc:8:20: error: expression list treated as compound expression in initializer [-fpermissive]
 LLL exgcd(LL a,LL b)
                    ^