foo.c: In function ‘main’:
foo.c:20:27: warning: array subscript 10 is above array bounds of ‘int[10]’ [-Warray-bounds=]
   20 |         while (b + 30>=arr[n])
      |                        ~~~^~~
foo.c:5:9: note: while referencing ‘arr’
    5 |     int arr[10] = { 0 };//苹果的高度
      |         ^~~