answer.code:3:14: error: expected unqualified-id before ‘__int128’
    3 | #define i128 __int128
      |              ^~~~~~~~
answer.code:6:1: note: in expansion of macro ‘i128’
    6 | i128 gcd(i128 a,i128 b) {return b?gcd(b,a%b):a;}
      | ^~~~
answer.code:3:14: error: expected unqualified-id before ‘__int128’
    3 | #define i128 __int128
      |              ^~~~~~~~
answer.code:7:1: note: in expansion of macro ‘i128’
    7 | i128 read() {ll x; cin>>x; return x;}
      | ^~~~
answer.code:3...