foo.cc: In function ‘bool build(int)’:
foo.cc:29:1: warning: no return statement in function returning non-void [-Wreturn-type]
   29 | }
      | ^
foo.cc: In function ‘void sol()’:
foo.cc:62:28: error: expected ‘;’ before ‘}’ token
   62 |         ans=min(anss(),ans)
      |                            ^
      |                            ;
   63 | 
   64 | }
      | ~                           
foo.cc:65:14: error: expected primary-expression before ‘:’ token
   65 |     if(ans>6):
      |              ^
foo.cc: In function ‘int anss()’:
foo.cc:48:14: warning: control reaches end of non-void function [-Wreturn-type]
   48 |              }
      |              ^