/in/foo.c: In function 'main':
/in/foo.c:46:11: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
   scanf("%d",a[i]);
           ^
/in/foo.c:50:11: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
   scanf("%d",b[i]);
           ^
/in/foo.c:37:8: warning: unused variable 'n' [-Wunused-variable]
  int i,n,x1,x2,na,nb;
        ^