How may I write a code to find maximum even number in a two dimensional list ?

Question

How may I write a code to find maximum even number in a two dimensional list ?

If the list was empty or all of numbers in list was odd it should return None

max () function cannot be used

Answer 1

# L is the 2D list

mymax = None

for row in L:
for col in row:
if col % 2 == 0:
if col > mymax:
mymax = col

EDIT: instead, try:

L = [[1,3], [5,6,7,8]]

ns = []
for row in L:
for col in row:
if col%2 == 0:
ns.append(col)

mymax = ns[0] if len(ns)>1 else None

for n in ns:
if col > mymax:
mymax = col

print(mymax)

Answer 2

@NIMA ,

There was a problem in your code. Fixing it I realized there was also a problem in my original suggestion, so I edited my post. I hope it helps.

Answer 3

How about this?

https://code.sololearn.com/cr2mYnJk3JLj/?ref=app

Answer 4

Try this
https://code.sololearn.com/cR9ETb480J32/?ref=app

Answer 5

Dear Pedro Demingos
Your code is appropriate but I always receive None based on your code:

https://code.sololearn.com/c4qfAfwE3j34/#py