# A problem in using python

• It's frustrating using python in the contest.

For problem number 1:
It should take little time finishing this problem using following code:

``````
class Solution(object):
def mergeTrees(self, t1, t2):
"""
:type t1: TreeNode
:type t2: TreeNode
:rtype: TreeNode
"""
if t1 is None:
return t2
if t2 is None:
return t1
t1.val += t2.val
t1.left = self.mergeTrees(t1.left, t2.left)
t1.right = self.mergeTrees(t1.right, t2.right)
return t1

``````

But there's a test case similar as follows:
[-1111111111,3,2,5]
[-1111111111,1,3,null,4,null,7]
for which the right answer should be [-2222222222,4,5,5,4,null,7]

But the expected answer is [2072745074,4,5,5,4,null,7] in the benchmark.

For problem number 3:
I used the same algorithm both in python and c++.
However the python code would not meet the time limit, cost me a long time to rewrite it into c++.

I actually get all the problems tackled, but due to these waste of time, I used 14 minutes longer than 90 minutes.

If following contests can consider more about the python coders, it would be better.

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