foo.cc: In function 'int main()':
foo.cc:8:40: error: expected primary-expression before 'double'
  if(a+b>c&&b+c>a&&a+c>b) printf("%d\n",double sqrt(s));
                                        ^~~~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。