answer.code: In function ‘LL lcm(LL, LL)’:
answer.code:15:5: error: named return values are no longer supported
   15 |     return a/gcd(a,b)*b;
      |     ^~~~~~
answer.code:32:1: warning: no return statement in function returning non-void [-Wreturn-type]
   32 | }
      | ^
answer.code: In function ‘int main()’:
answer.code:42:9: error: ‘getblock’ was not declared in this scope
   42 |         getblock();
      |         ^~~~~~~~