foo.cc: In function 'int main()':
foo.cc:10:5: error: expected ';' before '}' token
     } else if (str == "p:=a^b^c^(a*b*c*(a+b)*b(b+c)+a)") {
     ^

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