foo.cc: In function 'int main()':
foo.cc:97:8: warning: unused variable 'g' [-Wunused-variable]
    int g=exgcd(d,x,p,y);
        ^
foo.cc:35:6: warning: unused variable 't' [-Wunused-variable]
  int t=0;
      ^

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