/in/foo.cc: In function 'int main()':
/in/foo.cc:59:71: error: 'sqrt' was not declared in this scope
        double len=sqrt((sc[g].x-j)*(sc[g].x-j)+(sc[g].y-k)*(sc[g].y-k));
                                                                       ^
/in/foo.cc:33:9: warning: unused variable 'h' [-Wunused-variable]
  char s,h[260];
         ^