comefrom: <doocs>1582.Special Positions in a Binary Matrix_1.py
code: def numSpecial( mat: List[List[int]]) -> int:
      m, n = len(mat), len(mat[0])
      r = [0] * m
      c = [0] * n
      for i, row in enumerate(mat):
          for j, v in enumerate(row):
              r[i] += v
              c[j] += v
      ans = 0
      for i in range(m):
          for j in range(n):
              if mat[i][j] == 1 and r[i] == 1 and c[j] == 1:
                  ans += 1
      return ans
masked: def sample_funcname ( var_0 : List [ List [ int ] ] ) -> int :
      var_4 , var_6 = len ( var_0 ) , len ( var_0 [ 0 ] )
      var_7 = [ 0 ] * var_4
      var_8 = [ 0 ] * var_6
      for var_10 , var_11 in enumerate ( var_0 ) :
          for var_12 , var_13 in enumerate ( var_11 ) :
              var_7 [ var_10 ] += var_13
              var_8 [ var_12 ] += var_13
      var_14 = 0
      for var_10 in range ( var_4 ) :
          for var_12 in range ( var_6 ) :
              if var_0 [ var_10 ] [ var_12 ] == 1 and var_7 [ var_10 ] == 1 and var_8 [ var_12 ] == 1 :
                  var_14 += 1
      return var_14
  