17 undefined names about leetcode HOT 4 CLOSED

Thanks for test.
ListNode and TreeNode are defined in comments. LeetCode defined them in the background, if we defined them clearly then LeetCode will give an error.

l_r_m at Array/KthLargestElementInAnArray.py , b and c at /Array/SumOfSubarrayMinimums.py are my fault,

Thanks again.

xrange is just for Python 2, if you run it on Python 3 please use range instead of it.

range also can run on Python 2, it is a list on Python 2 rather than a generator.

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To support both Python 2 and Python 3 just put this at the top of xrange() files:

try:
    xrange          # Python 2
except NameError:
    xrange = range  # Python 3

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Inside the functions that use ListNode or TreeNode, you can put global ListNode or global TreeNode to acknowledge that these are created elsewhere.

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@cclauss
I think that is not necessary.

We can find definition information at the top of the files that use ListNode or TreeNode.

# Definition for singly-linked list.
# class ListNode(object):
#     def __init__(self, x):
#         self.val = x
#         self.next = None

They are just being commented to fit test of LeetCode.

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