/in/foo.c: In function 'main':
/in/foo.c:10:5: warning: implicit declaration of function 'go' [-Wimplicit-function-declaration]
  ys=go(x[1],x[2]);
     ^~
/in/foo.c:4:27: warning: unused variable 'h' [-Wunused-variable]
  int n,x[100000],i,j,ys,k,h;
                           ^