/in/foo.cc: In function 'int main()':
/in/foo.cc:19:15: error: expected primary-expression before '{' token
   (tem1>tem2)?{ans+=tem1,lta++,rtb--}:{ans+=tem2,rta--,ltb++};
               ^
/in/foo.cc:19:15: error: expected ':' before '{' token
/in/foo.cc:19:15: error: expected primary-expression before '{' token
/in/foo.cc:19:38: error: expected primary-expression before ':' token
   (tem1>tem2)?{ans+=tem1,lta++,rtb--}:{ans+=tem2,rta--,ltb++};
                                      ^