comefrom: <doocs>1588.Sum of All Odd Length Subarrays_1.py
code: def sumOddLengthSubarrays( arr: List[int]) -> int:
      n = len(arr)
      presum = [0] * (n + 1)
      for i in range(n):
          presum[i + 1] = presum[i] + arr[i]
      
      res = 0
      for i in range(n):
          for j in range(0, n, 2):
              if i + j < n:
                  res += presum[i + j + 1] - presum[i]
      return res
masked: def sample_funcname ( var_0 : List [ int ] ) -> int :
      var_4 = len ( var_0 )
      var_7 = [ 0 ] * ( var_4 + 1 )
      for var_9 in range ( var_4 ) :
          var_7 [ var_9 + 1 ] = var_7 [ var_9 ] + var_0 [ var_9 ]
      var_10 = 0
      for var_9 in range ( var_4 ) :
          for var_12 in range ( 0 , var_4 , 2 ) :
              if var_9 + var_12 < var_4 :
                  var_10 += var_7 [ var_9 + var_12 + 1 ] - var_7 [ var_9 ]
      return var_10
  