class_docstr: Calculate the Munkres solution to the classical assignment problem.
  See the module documentation for usage.
docstr: For each row of the matrix, find the smallest element and
  subtract it from every element in its row. Go to Step 2.
docstr_tok: ["For","each","row","of","the","matrix",",","find","the","smallest","element","and","subtract","it","from","every","element","in","its","row",".","Go","to","Step","2","."]
code: def __step1(self):
      """
      For each row of the matrix, find the smallest element and
      subtract it from every element in its row. Go to Step 2.
      """
      C = self.C
      n = self.n
      for i in range(n):
          minval = min(self.C[i])
          # Find the minimum value for this row and subtract that minimum
          # from every element in the row.
          for j in range(n):
              self.C[i][j] -= minval
  
      return 2
  
imports: import sys
label_desc: Use image node_id 7 for calling the Munkres obj's underlying member method code with example usage: obj.__step1() and returns: int