File size: 966 Bytes
0936134 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | import unittest
from tree import TreeNode
class Solution:
def widthOfBinaryTree(self, root):
"""
:type root: TreeNode
:rtype: int
"""
if not root:
return 0
result = 1
q = [(root, 0)]
while q:
result = max(result, q[-1][1] - q[0][1] + 1)
next_q = []
for node, i in q:
if node.left:
next_q.append((node.left, i << 1))
if node.right:
next_q.append((node.right, (i << 1) + 1))
q = next_q
return result
class Test(unittest.TestCase):
def test_serialize(self):
self._test([1, 3, 2, 5, None, None, 9, 6, None, None, 7], 8)
def _test(self, root, expected):
root = TreeNode.from_array(root)
actual = Solution().widthOfBinaryTree(root)
self.assertEqual(expected, actual)
if __name__ == '__main__':
unittest.main()
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