/in/foo.cc: In function 'int main()':
/in/foo.cc:32:17: error: 'abs' was not declared in this scope
   if(K>=abs(x-x1)+abs(y-y1)+1+x) K-=abs(x-x1)+abs(y-y1);
                 ^
/in/foo.cc:35:21: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'int' [-Wformat=]
  printf("%lld\n",ans);
                     ^