message: Update range-sum-query-2d-immutable.py
diff: @@ -15,10 +15,8 @@ class NumMatrix(object):
  self.__sums = [[0 for _ in xrange(n+1)] for _ in xrange(m+1)]
  for i in xrange(1, m+1):
  for j in xrange(1, n+1):
  - self.__sums[i][j] = self.__sums[i][j-1] + matrix[i-1][j-1]
  - for j in xrange(1, n+1):
  - for i in xrange(1, m+1):
  - self.__sums[i][j] += self.__sums[i-1][j]
  + self.__sums[i][j] = self.__sums[i][j-1] + self.__sums[i-1][j] - \
  + self.__sums[i-1][j-1] + matrix[i-1][j-1]
  def sumRegion(self, row1, col1, row2, col2):
  """
  