Write a Python function that returns the smallest value as well
its row and column in a two dimensional matrix that has
the same number of rows as columns. Ignore the diagnonal entries
because they are trivially zero. The function definition would be

def find_closest_pair(d):

For example if the matrix is 

d = [ [0, 2, 4 ],
      [2, 0, 3 ],
      [4, 3, 0 ] ]

then your function would return

[2, 0, 1] 

to indicate the smallest non-zero number in the matrix
(2 in this case) and its row and column (0 and 1 in this
case).

Submit hardcopies in class on Apr 7th.