comefrom: <doocs>0969.Pancake Sorting_1.py
code: def reverse(arr, j):
      i = 0
      while i < j:
          arr[i], arr[j] = arr[j], arr[i]
          i, j = i + 1, j - 1
masked: def sample_funcname ( var_0 , var_1 ) :
      var_3 = 0
      while var_3 < var_1 :
          var_0 [ var_3 ] , var_0 [ var_1 ] = var_0 [ var_1 ] , var_0 [ var_3 ]
          var_3 , var_1 = var_3 + 1 , var_1 - 1
  