def deleteNode(self, root: TreeNode, key: int) -> TreeNode:
"""
如果 node.val == key，分三种情况
1. 如果 node 是叶子节点, 直接令 node = None
2. 如果 node 只有一个子节点，则把子节点移动到当前节点替换
3. 如果 node 有两个子节点，则用 right 的最小节点替换当前节点
"""
if not root:
return None
if key < root.val:
# 递归左侧
root.left = self.deleteNode(root.left, key)
elif key > root.val:
# 递归右侧
root.right = self.deleteNode(root.right, key)
else:
# 当 node.val == key
# 本身就包含了 root.left == root.right == None 的情况
if root.left is None:
return root.right
elif root.right is None:
return root.left
else:
min_node = self.findMin(root.right)
root.val = min_node.val
root.right = self.deleteNode(root.right, min_node.val)
return root
def build(stop):
if inorder and inorder[-1] != stop:
root = TreeNode(preorder.pop())
root.left = build(root.val)
inorder.pop()
root.right = build(stop)
return root
def sortedListToBST(self, head: ListNode) -> TreeNode:
"""
:param nums: 从小到大排好序了
"""
if not head:
return None
if not head.next:
return TreeNode(head.val)
slow = head
fast = head.next.next
while fast and fast.next:
slow = slow.next
fast = fast.next.next
mid = slow
# 从 mid 开始截断，这样后面再传 head 就相当于只传前半段
tmp = mid.next
mid.next = None
root = TreeNode(tmp.val)
root.left = self.sortedListToBST(head)
root.right = self.sortedListToBST(tmp.next)
return root
def helper(s):
cur = next(s)
if cur == "#": return
node = TreeNode(cur)
node.left = helper(s)
node.right = helper(s)
return node
def deserialize(self, data):
"""Decodes your encoded data to tree.
:type data: str
:rtype: TreeNode
"""
if not data:
return None
try:
left_bound = data.index('(')
except ValueError:
return TreeNode(int(data))
right_bound = 0
counter = 0
while right_bound < len(data):
if data[right_bound] == '(':
counter += 1
elif data[right_bound] == ')':
counter -= 1
if counter == 0:
right_bound += 1
break
right_bound += 1
val = int(data[:left_bound])
left_data = data[left_bound+1:right_bound-1]
right_data = data[right_bound+1:-1]
node = TreeNode(val)
node.left = self.deserialize(left_data)
node.right = self.deserialize(right_data)
return node
def buildTree(preorder: 'list[int]', inorder: 'list[int]') -> TreeNode:
if inorder:
ind = inorder.index(preorder.pop(0))
root = TreeNode(inorder[ind])
root.left = buildTree(preorder, inorder[0:ind])
root.right = buildTree(preorder, inorder[ind + 1:])
return root
def node_from_preorder(p_i: int, p_j: int) -> TreeNode:
"""
p_i and p_j is left and right bounds for preorder list
If bounds not valid (list not empty) -> return null
Create node from left element in preorder
With binary search search for first element which index in inorder is greater than node's
Link node created with bounds p_i + 1 (miss first element) and left as left child
Link node created with bound left and p_j as right child
Return node
"""
if p_i >= p_j:
return None
node = TreeNode(preorder[p_i])
left, right = p_i + 1, p_j - 1
while left <= right:
mid = (left + right) // 2
if indices[preorder[mid]][1] > indices[node.val][1]:
right = mid - 1
else:
left = mid + 1
node.left = node_from_preorder(p_i + 1, left)
node.right = node_from_preorder(left, p_j)
return node
def help(nums, l, h):
m = (l + h) // 2
node = TreeNode(nums[m])
if l <= m - 1:
node.left = help(nums, l, m - 1)
if m + 1 <= h:
node.right = help(nums, m + 1, h)
return node
def deserialize_tree_util(nodes):
val = nodes.pop()
if val == '$':
return None
root = TreeNode(int(val))
root.left = deserialize_tree_util(nodes)
root.right = deserialize_tree_util(nodes)
return root
def sortedArrayToBST(self, nums: List[int]):
if not nums:
return
mid = len(nums) // 2
root = TreeNode(nums[mid])
root.left = self.sortedArrayToBST(nums[:mid])
root.right = self.sortedArrayToBST(nums[mid + 1:])
return root
def buildTree(self, preorder: List[int], inorder: List[int]) -> TreeNode:
if len(preorder) == 0:
return None
mid = inorder.index(preorder[0])
t = TreeNode(preorder[0])
t.left = self.buildTree(preorder[1:mid + 1], inorder[:mid])
t.right = self.buildTree(preorder[mid + 1:], inorder[mid + 1:])
return t
def generate(self, l, r):
if l > r:
return None
mid = (l + r) / 2
node = TreeNode(self.nums[mid])
node.left = self.generate(l, mid - 1)
node.right = self.generate(mid + 1, r)
return node
def sortedArrayToBST(self, nums: List[int]) -> TreeNode:
if len(nums) == 0:
return None
i = (len(nums) - 1) // 2
root = TreeNode(nums[i])
root.left = self.sortedArrayToBST(nums[:i])
root.right = self.sortedArrayToBST(nums[i + 1:])
return root
def min_height_bst_from_sorted_array(A):
if not A:
return None
mid = len(A) / 2
root = TreeNode(A[mid])
root.left = min_height_bst_from_sorted_array(A[:mid])
root.right = min_height_bst_from_sorted_array(A[mid + 1:])
return root
def sorted_array2bst(nums):
if not nums:
return None
mid = len(nums) // 2
root = TreeNode(nums[mid])
root.left = sorted_array2bst(nums[:mid])
root.right = sorted_array2bst(nums[mid+1:])
return root
def addToTree(arr, start, end):
if end < start:
return None
mid = (start + end) // 2
n = TreeNode(arr[mid])
n.left = addToTree(arr, start, mid - 1)
n.right = addToTree(arr, mid + 1, end)
return n
def des():
if not data: return None
val = data.pop(0)
if val == '#':
return None
node = TreeNode(val)
node.left = des()
node.right = des()
return node
def sortedArrayToBST_1(self, nums, l, h):
if h < l:
return None
mid = (l+h) / 2
node = TreeNode(nums[mid])
node.left = self.sortedArrayToBST_1(nums, l, mid-1)
node.right = self.sortedArrayToBST_1(nums, mid+1, h)
return node
def buildTree(self, preorder: List[int], inorder: List[int]):
if not preorder or not inorder:
return
root_val = preorder.pop(0)
root = TreeNode(root_val)
idx = inorder.index(root_val)
root.left = self.buildTree(preorder, inorder[:idx])
root.right = self.buildTree(preorder, inorder[idx + 1:])
return root
def reConstructBinaryTree(self, pre, tin):
# assert(len(pre) == len(tin))
if len(pre) == 0:
return None
treeNode = TreeNode(pre[0])
mid = tin.index(pre[0])
treeNode.left = self.reConstructBinaryTree(pre[1:mid + 1], tin[0:mid])
treeNode.right = self.reConstructBinaryTree(pre[mid + 1:len(pre)], tin[mid + 1:len(tin)])
return treeNode
def buildTree(postorder, inorder):
if not postorder or not inorder:
return None
tree_val = postorder[-1]
root = TreeNode(tree_val)
left_index = inorder.index(tree_val)
root.left = buildTree(postorder[:left_index], inorder[:left_index])
root.right = buildTree(postorder[left_index:-1], inorder[left_index + 1:])
return root
def helper():
val = vals.pop()
if val == '':
return None
node = TreeNode(int(val))
node.left = helper()
node.right = helper()
return node
def create_binary_search_tree(array, start, end):
if end < start:
return None
middle = (start + end) // 2
root = TreeNode(array[middle])
root.left = create_binary_search_tree(array, start, middle - 1)
root.right = create_binary_search_tree(array, middle + 1, end)
return root
def test_countNodes(self):
from solution_0222 import Solution
from utils import TreeNode
solution = Solution()
root = TreeNode(1, TreeNode(2), TreeNode(3))
root.left.add_left(4)
root.left.add_right(5)
root.right.add_left(6)
self.assertEqual(solution.countNodes(root), 6)
def deserialize(nodes):
if len(nodes) < 1:
return None
if nodes[-1] == "$":
nodes.pop()
return None
root = TreeNode(int(nodes.pop()))
root.left = deserialize(nodes)
root.right = deserialize(nodes)
return root
def test_solution():
s = Solution()
tree1 = TreeNode(1, TreeNode(3, TreeNode(5)), TreeNode(2))
tree2 = TreeNode(2, TreeNode(1, None, TreeNode(4)),
TreeNode(3, None, TreeNode(7)))
tree3 = s.mergeTrees(tree1, tree2)
print(tree3)
def sortedListToBST(self, head: ListNode) -> TreeNode:
# 空列表 return
if head is None:
return None
# 单节点 return
if head.next is None:
return TreeNode(head.val)
# 2个节点 return
if head.next and head.next.next is None:
root = TreeNode(head.next.val)
root.left = TreeNode(head.val)
return root
# 快慢指针，快指针到终点时，慢指针正好是中点
prev = fast = slow = head
while True:
if fast.next:
fast = fast.next
else:
break
if fast.next:
fast = fast.next
else:
break
if slow.next:
prev = slow
slow = slow.next
# 断开链接到中点的link
prev.next = None
root = TreeNode(slow.val)
# 递归生成子树
root.left = self.sortedListToBST(head)
root.right = self.sortedListToBST(slow.next)
return root
def test_inorder_traversal(self):
# 1
# \
# 2
# /
# 3
root = TreeNode(1)
root.right = TreeNode(2)
root.right.left = TreeNode(3)
self.assertListEqual([1, 3, 2], inorder_traversal_recursive(root))
self.assertListEqual([1, 3, 2], inorder_traversal_iterative(root))
def test_solution():
s = Solution()
assert s.isSameTree(tree, tree) == True
p = TreeNode(1, TreeNode(2), TreeNode(3))
q = TreeNode(1, TreeNode(2), TreeNode(3))
assert s.isSameTree(p, q) == True
p = TreeNode(1, TreeNode(2))
p = TreeNode(1, None, TreeNode(2))
assert s.isSameTree(p, q) == False
def flatten(self, root: TreeNode) -> None:
if not root:
return
if root.right and root.left:
traverse_to_next(root.left).right = root.right
if root.left:
root.right = root.left
root.left = None
if root.right:
self.flatten(root.right)
def pruneTree(self, root: TreeNode) -> TreeNode:
if not root:
return None
root.left = self.pruneTree(root.left)
root.right = self.pruneTree(root.right)
if root.val == 0 and not root.right and not root.left:
return None
return root
def go(node: TreeNode) -> TreeNode:
if node is None:
return None
if node.val < L:
return go(node.right)
elif node.val > R:
return go(node.left)
else:
node.left = go(node.left)
node.right = go(node.right)
return node
def trim(node: TreeNode) -> TreeNode:
if not node:
return None
elif node.val > R:
# 右子树的值都大于 node.val，当 node.val 都大于 R，则直接抛弃右子树
return trim(node.left)
elif node.val < L:
return trim(node.right)
else:
node.left = trim(node.left)
node.right = trim(node.right)
return node
def test():
root = TreeNode(1)
root.left = TreeNode(2)
root.right = TreeNode(3)
root.left.left = TreeNode(4)
root.left.right = TreeNode(5)
root.right.left = TreeNode(6)
root.right.right = TreeNode(7)
print("LCA(4, 5) = ", LCA(root, 4, 5).val)
print("LCA(4, 6) = ", LCA(root, 4, 6).val)
print("LCA(3, 4) = ", LCA(root, 3, 4).val)
print("LCA(2, 4) = ", LCA(root, 2, 4).val)
def op(start, end):
if start == end:
return TreeNode(nums[start])
elif end - start == 1:
root = TreeNode(nums[start])
root.right = TreeNode(nums[end])
return root
else:
pivot = (start + end)/2
root = TreeNode(nums[pivot])
root.left = op(start, pivot-1)
root.right = op(pivot+1, end)
return root
def create_tree_by_preorder(pre_list, mid_list):
if not pre_list:
return None
if not mid_list:
return None
tree_val = pre_list[0]
root = TreeNode(tree_val)
left_index = mid_list.index(tree_val)
root.left = create_tree_by_preorder(pre_list[1:left_index + 1],
mid_list[:left_index])
root.right = create_tree_by_preorder(pre_list[left_index + 1:],
mid_list[left_index + 1:])
return root
def generate(self, l, r):
if l > r:
return [None]
res = []
for i in range(l, r + 1):
for left in self.generate(l, i - 1):
for right in self.generate(i + 1, r):
node = TreeNode(i)
node.left = left
node.right = right
res.append(node)
return res
def magic(pre, post):
if not pre:
return None
elif len(pre) == 1:
return TreeNode(pre[0])
else:
pv = pre[0]
ll = post.index(pre[1]) + 1
l = magic(pre[1 : 1 + ll], post[:ll])
r = magic(pre[ll + 1 :], post[ll:-1])
p = TreeNode(pv)
p.left = l
p.right = r
return p
def constructBT(s):
if not s: return None
# print(f"s: {s}")
paren = s.find("(")
val = int(s) if paren == -1 else int(s[:paren])
node = TreeNode(val)
if paren == -1: return node # if no parentheses found, then return
start, count = paren, 0
for i in range(start, len(s)):
if s[i] == "(": count += 1
elif s[i] == ")": count -= 1
if count == 0 and start == paren: # build the left child
node.left = constructBT(s[start+1:i])
start = i+1 # start process the right child's string
elif count == 0: # build the right child
node.right = constructBT(s[start+1:i])
return node
def sortedListToBST(self, head):
"""
:type head: ListNode
:rtype: TreeNode
"""
if head is None:
return None
fast, prev, slow = head, None, head
while fast and fast.next:
fast = fast.next.next
prev, slow = slow, slow.next
root = TreeNode(slow.val)
if prev:
prev.next = None
else:
return root
root.left = self.sortedListToBST(head)
root.right = self.sortedListToBST(slow.next)
return root
def test_findTilt():
t1 = TreeNode(1)
t2 = TreeNode(2)
t3 = TreeNode(3)
t1.left = t2
t1.right = t3
assert findTilt(t1) == 1, findTilt(t1)
t4 = TreeNode(4)
t5 = TreeNode(5)
t2.left = t4
t3.left = t5
assert findTilt(t1) == 11, findTilt(t1)
"""
538 convert bst to greater tree
"""
from utils import TreeNode
sum = 0
def convertBST(root):
# traverse from right node -> current node -> left node
if not root: return
convertBST(root.right)
global sum
sum += root.val
print(f"{root.val} -> {sum}")
root.val = sum
convertBST(root.left)
t1 = TreeNode(5)
t2 = TreeNode(2)
t3 = TreeNode(13)
t4 = TreeNode(10)
t1.left = t2
t1.right = t3
t3.left = t4
convertBST(t1)
def in_order_tree(node):
if node.left:
for x in in_order_tree(node.left):
yield x
yield node.val
if node.right:
for x in in_order_tree(node.right):
yield x
if not root:
return True
old_value = None
print list(in_order_tree(root))
for val in in_order_tree(root):
if not old_value:
old_value = val
continue
if val <= old_value:
return False
old_value = val
return True
if __name__ == '__main__':
# print Solution().isValidBST(TreeNode.build_by_level_order([1, '#', 2, 3, '#']))
# print Solution().isValidBST(TreeNode.build_by_level_order([2, 1, 3]))
# print Solution().isValidBST(TreeNode.build_by_level_order([]))
# print Solution().isValidBST(TreeNode.build_by_level_order([2]))
# print Solution().isValidBST(TreeNode.build_by_level_order([10, 5, 15, '#', '#', 6, 20]))
# print Solution().isValidBST(TreeNode.build_by_level_order([1, 1, '#']))
# print Solution().isValidBST(TreeNode.build_by_level_order([0]))
print Solution().isValidBST(TreeNode.build_by_level_order([0, '#', -1]))
"""
:type root: TreeNode
:rtype: List[List[int]]
"""
if root is None:
return []
current_level = [root]
next_level = []
result = []
while current_level:
level_value_list = []
for current_node in current_level:
level_value_list.append(current_node.val)
next_level.append(current_node.left) if current_node.left else None
next_level.append(current_node.right) if current_node.right else None
current_level = next_level
next_level = []
result.append(level_value_list)
return result
if __name__ == '__main__':
t = TreeNode.build_by_level_order([1,2,3,'#','#',4,'#','#',5])
print Solution().levelOrder(t)
TreeNode.print_in_level_order(t)
t2 = TreeNode.build_by_level_order([3,9,20,'#','#',15,7])
print Solution().levelOrder(t2)
t3 = TreeNode.build_by_level_order([3])
print Solution().levelOrder(t3)
__author__ = 'clp'
from utils import TreeNode
null = '#'
class Solution(object):
def isBalanced(self, root):
"""
:type root: TreeNode
:rtype: bool
"""
def op(root):
if root == None:
return 0, True
left_depth, left_balance = op(root.left)
right_depth, right_balance = op(root.right)
return max(left_depth, right_depth) + 1, \
(left_balance and right_balance and (-1 <= left_depth - right_depth <= 1))
return op(root)[1]
if __name__ == '__main__':
print Solution().isBalanced(TreeNode.build_by_level_order([1, 2, 3, 4, null, null, null, 5]))
print Solution().isBalanced(TreeNode.build_by_level_order([1, 2, 3, 4, null, null, null]))
def helper(root): if not root: return if interval.left <= root.val <= interval.right: helper(root.left) res.append(root.val) helper(root.right) elif interval.left > root.val: helper(root.right) else: helper(root.left) res = [] helper(root) return res root = TreeNode(19) root.left = TreeNode(7) root.left.left = TreeNode(3) root.left.left.left = TreeNode(2) root.left.left.right = TreeNode(5) root.left.right = TreeNode(11) root.left.right.right = TreeNode(17) root.left.right.right.left = TreeNode(13) root.right = TreeNode(43) root.right.left = TreeNode(23) root.right.left.right = TreeNode(37) root.right.left.right.left = TreeNode(29) root.right.left.right.left.right = TreeNode(31) root.right.left.right.right = TreeNode(41)
from utils import TreeNode
class Solution(object):
def rightSideView(self, root):
"""
:type root: TreeNode
:rtype: List[int]
"""
if root is None:
return []
current_level = [root]
next_level = []
result = []
while current_level:
result.append(current_level[-1].val)
for node in current_level:
next_level.extend([n for n in [node.left, node.right] if n is not None])
current_level = next_level
next_level = []
return result
if __name__ == '__main__':
print Solution().rightSideView(TreeNode.build_by_level_order([1, 2, 3, '#', 5, '#', 4]))
print Solution().rightSideView(TreeNode.build_by_level_order([1]))
print Solution().rightSideView(TreeNode.build_by_level_order(None))
class Solution(object):
def sortedArrayToBST(self, nums):
"""
:type nums: List[int]
:rtype: TreeNode
"""
def op(start, end):
if start == end:
return TreeNode(nums[start])
elif end - start == 1:
root = TreeNode(nums[start])
root.right = TreeNode(nums[end])
return root
else:
pivot = (start + end)/2
root = TreeNode(nums[pivot])
root.left = op(start, pivot-1)
root.right = op(pivot+1, end)
return root
if len(nums) == 0:
return None
return op(0, len(nums)-1)
if __name__ == '__main__':
TreeNode.print_in_level_order(Solution().sortedArrayToBST([1,2,3,4,5]))
TreeNode.print_in_level_order(Solution().sortedArrayToBST([1,2,3,4,5,6]))
TreeNode.print_in_level_order(Solution().sortedArrayToBST([1,2]))
TreeNode.print_in_level_order(Solution().sortedArrayToBST([1]))
TreeNode.print_in_level_order(Solution().sortedArrayToBST([]))
:type root: TreeNode
:rtype: int
"""
if not root:
return 0
left, right = root.left, root.right
left_height, right_height = 0, 0
while left:
left_height += 1
left = left.left
while right:
right_height += 1
right = right.right
if right_height == left_height:
return (1 << (1+left_height)) - 1
else:
# cl = self.countNodes(root.left)
# cr = self.countNodes(root.right)
# print "1 + %d + %d" % (cl, cr)
# return 1 + cl + cr
return 1 + self.countNodes(root.left) + self.countNodes(root.right)
if __name__ == "__main__":
print Solution().countNodes(TreeNode.build_by_level_order([1, 2, 3, '#', '#', '#', '#']))
print Solution().countNodes(TreeNode.build_by_level_order([1, 2, 3, 5, '#', '#', '#']))
print Solution().countNodes(TreeNode.build_by_level_order([1, 2, 3, 5, 6, '#', '#']))
print Solution().countNodes(None)
print Solution().countNodes(TreeNode.build_by_level_order([1]))
print Solution().countNodes(TreeNode.build_by_level_order([2,8,1,1,6,0,8,4,0,9,1,1,2,7,5,5,5,4,0,9,6,5,1,8,2,0,1,8,9,1,0,2,1,9,5,4,1,4,3,4,7,8,5,0,6,5,8,6,3,6,0,4,7,3,0,6,8,0,5,5,5,3,4,4,0,3,1,1,4,4,1,0,4,1,0,9,0,8,7,5,6,2,0,1,8,7,9,2,9,1,2,1,9,5,5,0,8,5,5,4,3,0,4,4,7,9,9,7,7,0,4,6,2,1,4,0,3,8,7,0,7,8,8,3,9,4,0,5,6,4,6,2,6,9,1,7,8,5,9,2,7,3,4,2,6,0,3,6,3,8,3,9,8,5,1,1,8,8,1,5,6,2,3,7,6,6,9,4,7,9,3,8,3,6,4,9,3,1,6,3,2,6,0,3,5,9,1,4,7,5,2,9,3,4,6,2,0,7,4,3,1,3,3,5,1,0,0,7,0,7,3,4,4,8,7,5,3,3,3,6,3,2,9,8,1,6,8,4,5,3,1,9,2,4,5,5,6,2,8,9,9,2,2,4,3,9,2,7,5,7,0,9,1,6,1,1,7,7,0,8,2,3,2,0,9,2,2,0,4,3,6,2,9,5,5,2,4,3,9,8,6,4,9,5,7,0,7,1,2,9,5,5,5,8,2,2,2,2,2,0,5,7,9,7,9,7,8,7,4,4,2,9,0,2,7,3,3,6,4,5,4,8,3,6,8,4,2,1,4,8,2,7,7,9,2,8,6,8,7,4,4,4,0,7,1,6,9,2,0,7,0,8,4,3,2,6,4,0,2,3,3,0,3,0,7,0,3,9,0,1,9,0,6,1,4,3,5,3,5,6,1,9,9,8,6,1,3,7,5,4,4,1,9,0,1,5,1,9,6,2,6,5,5,2,4,8,5,4,5,1,6,5,4,7,7,9,0,3,5,2,7,2,8,9,6,8,1,7,6,8,7,6,5,8,5,7,2,1,9,2,2,1,4,4,6,0,6,0,6,1,0,5,4,4,1,5,7,9,3,1,0,2,2,4,8,8,5,9,2,0,2,4,3,7,0,6,8,8,4,1,3,6,6,3,0,4,6,7,8,0,8,6,5,2,7,0,4,9,3,8,4,3,5,0,7,6,8,7,8,5,9,2,6,4,9,5,8,2,3,2,4,0,7,0,3,9,2,1,7,3,6,3,3,1,2,6,9,0,3,9,7,0,9,5,4,2,4,1,4,0,5,2,8,8,4,4,4,0,1,6,4,4,1,6,9,7,7,2,6,8,4,2,2,5,2,0,0,4,4,3,8,1,7,2,8,1,8,8,4,6,5,9,0,3,8,0,6,7,2,0,0,3,9,6,9,7,3,6,6,5,4,6,7,8,4,0,2,4,5,2,0,5,3,5,7,4,9,9,2,3,9,4,9,8,1,6,4,0,2,2,2,4,1,0,1,3,2,8,7,3,9,0,7,9,4,4,0,2,9,4,4,1,7,4,9,0,9,1,0,2,9,5,0,5,3,5,7,9,4,4,7,5,6,0,5,5,7,4,1,0,4,5,8,8,5,5,4,0,7,3,9,5,9,5,5,1,7,8,6,9,2,2,9,1,1,4,6,4,3,6,9,6,2,5,3,9,4,1,7,1,2,0,7,8,3,8,8,2,4,1,3,7,8,2,6,4,0,1,0,4,8,8,2,1,4,4,2,4,3,6,5,2,4,0,0,2,1,4,4,3,2,9,5,1,8,3,4,8,0,5,6,9,5,7,8,9,4,1,8,0,6,1,3,8,4,8,8,2,1,3,1,4,9,1,5,0,2,4,8,8,9,9,6,0,3,7,3,8,8,3,4,6,7,5,5,8,2,5,6,9,8,8,0,8,8,5,4,6,3,6,0,5,4,9,6,5,9,5,9,7,0,9,2,6,8,2,1,0,5,8,7,6,3,8,8,2,8,0,8,4,6,6,3,2,3,1,7,0,1,7,2,8,2,6,8,0,6,7,3,9,6,6,3,8,1,9,3,0,2,6,4,8,8,2,5,5,6,7,4,5,5,7,3,4,0,3,1,9,9,1,5,7,8,5,4,8,4,0,6,1,0,7,5,4,1,0,6,0,5,5,0,8,4,0,0,3,9,4,1,2,5,1,0,6,5,9,9,0,8,1,4,6,2,5,5,9,9,5,4,8,2,0,0,7,7,2,8,5,5,9,2,7,7,7,2,4,8,0,0,5,2,9,4,8,4,8,5,9,2,0,5,8,0,4,4,2,0,5,3,2,0,6,2,6,3,9,0,7,0,5,8,2,4,2,9,0,4,1,2,9,8,7,8,0,8,9,4,3,5,2,7,1,2,8,1,7,2,8,4,1,4,7,7,5,0,7,9,7,2,7,7,3,2,7,6,6,2,8,0,0,3,3,0,1,2,8,5,6,9,5,7,6,0,3,5,5,0,6,6,0,1,1,3,1,7,1,6,4,7,2,7,8,2,0,0,1,7,8,3,9,7,2,7,3,2,6,3,5,0,5,8,6,0,9,9,8,9,1,3,4,3,1,9,8,1,4,4,7,6,8,7,2,7,4,0,9,8,2,7,5,1,3,0,1,8,5,4,5,1,2,5,1,0,3,7,7,9,0,3,0,7,6,6,2,2,1,3,7,1,9,2,1,7,9,7,4,0,8,0,5,4,3,9,0,3,1,3,1,0,0,6,0,1,7,0,0,3,8,5,2,0,7,2,0,2,4,3,6,5,1,4,5,3,2,1,4,1,5,6,2,6,8,6,4,1,6,8,7,4,9,3,1,9,8,8,5,7,9,0,4,0,7,0,9,9,9,9,2,3,5,8,2,3,0,9,4,3,4,6,6,3,0,3,6,5,8,5,6,5,9,2,5,2,6,7,6,5,7,9,1,5,0,4,1,0,8,6,3,7,9,4,5,5,7,2,1,3,9,2,4,3,2,8,2,1,6,9,3,7,1,8,1,8,2,6,1,5,9,4,8,8,5,7,7,7,6,4,4,6,5,2,8,2,5,8,2,4,8,1,7,8,0,1,1,4,3,1,8,9,3,5,4,5,1,3,1,5,4,0,9,5,4,4,5,9,0,8,9,4,4,2,0,4,6,9,6,9,3,4,6,0,2,1,7,7,1,6,5,9,4,5,8,5,8,2,0,2,9,8,5,7,2,5,0,0,6,4,6,7,5,7,6,2,6,2,3,4,4,9,0,1,5,3,8,8,7,0,4,6,5,4,1,0,2,7,8,1,0,2,0,7,4,2,0,4,9,1,3,3,7,8,3,6,4,9,9,6,4,7,8,3,1,9,3,7,8,0,2,5,3,9,5,6,7,6,7,6,1,4,9,3,8,0,9,4,5,8,9,9,2,6,6,0,2,8,2,5,6,5,7,5,9,7,5,6,6,5,0,6,3,1,7,1,2,3,7,9,9,7,6,3,8,4,6,7,9,5,5,6,7,1,0,5,6,7,1,5,1,9,9,9,8,8,1,3,6,2,7,6,1,2,8,9,8,7,5,8,8,4,1,6,9,2,3,3,0,2,8,3,9,6,3,2,7,6,8,2,2,3,3,4,2,1,6,9,4,3,7,5,1,5,2,7,6,0,8,5,2,4,1,7,3,9,5,7,2,8,4,2,4,8,9,6,1,7,5,2,5,2,0,6,8,3,7,5,7,3,9,6,4,1,0,0,3,0,3,0,3,4,3,5,4,8,7,5,1,0,4,7,6,2,1,1,5,4,2,0,2,1,2,6,2,1,3,3,2,1,2,1,1,2,0,0,7,6,7,3,6,3,7,1,2,9,3,8,5,3,9,4,5,8,7,0,7,4,0,0,7,0,6,5,7,9,6,3,0,5,3,7,7,7,8,5,5,3,0,1,7,6,1,5,4,0,1,9,3,9,9,8,7,2,4,1,3,0,7,5,5,9,5,5,8,6,5,8,1,3,7,2,8,8,0,8,5,7,0,2,0,3,5,3,2,1,2,7,7,1,0,4,9,5,3,7,7,9,1,0,7,2,4,0,0,4,9,3,0,9,0,3,1,1,6,1,4,5,8,0,6,2,5,7,5,3,6,2,3,2,1,6,6,8,3,0,1,7,2,3,3,4,4,0,8,5,5,8,4,2,5,2,9,1,5,3,9,2,2,3,8,7,3,7,7,6,1,9,7,0,3,2,5,9,1,5,8,4,6,7,6,6,2,0,7,1,1,5,0,3,2,0,2,2,8,0,2,7,7,8,7,0,4,6,7,6,4,7,7,4,9,1,5,9,2,6,4,5,4,6,3,6,2,8,6,6,4,8,1,0,8,7,0,1,1,8,9,6,2,8,5,9,2,5,4,7,6,5,3,2,0,9,8,3,8,6,5,0,7,2,2,4,1,0,7,1,0,1,4,9,0,6,0,6,1,6,3,8,4,9,7,5,9,5,4,0,5,6,6,0,7,1,7,5,2,8,5,3,9,7,6,2,0,7,6,0,7,9,5,6,8,3,1,8,7,3,0,5,1,3,3,4,8,2,7,6,7,2,4,4,4,5,2,5,9,8,2,3,7,9,2,4,3,9,2,1,8,4,4,3,9,3,0,2,6,3,3,8,5,6,3,3,3,4,3,9,8,2,3,1,3,3,3,2,8,6,3,3,8,2,5,2,6,5,7,6,5,8,3,0,5,7,3,4,8,6,7,6,3,8,6,4,9,1,1,9,2,7,1,7,5,0,9,4,2,1,0,0,7,2,4,3,0,6,5,7,1,3,2,1,9,0,8,0,9,4,3,6,0,0,1,2,0,9,6,0,9,6,9,6,2,1,4,9,8,9,6,1,3,7,4,3,8,3,5,2,3,8,9,1,6,5,7,4,0,7,4,9,1,2,9,9,1,3,2,2,1,9,2,0,3,9,4,5,4,4,4,1,2,4,1,4,9,7,3,3,0,1,2,8,7,0,1,5,7,4,4,5,4,6,0,9,0,3,6,3,1,7,1,5,7,5,4,4,0,6,9,6,2,9,2,5,7,8,0,9,2,6,0,2,5,6,2,5,5,0,6,8,0,2,7,6,3,5,2,8,2,1,9,5,2,4,6,9,2,3,9,2,2,3,5,6,0,4,7,8,9,2,1,8,3,9,1,7,1,0,9,1,1,1,9,1,2,8,8,5,6,6,5,2,9,2,6,1,3,3,2,5,6,5,5,4,6,6,3,1,7,1,0,5,5,8,8,2,0,9,0,0,9,7,0,8,7,7,2,5,7,8,5,1,1,6,7,5,1,8,0,7,5,0,6,4,4,4,7,0,9,9,5,3,9,0,5,3,2,0,1,6,6,6,0,0,4,8,8,8,1,9,6,2,0,5,7,7,4,9,3,4,2,3,0,5,3,1,5,7,4,3,9,7,6,5,0,6,5,9,8,3,4,6,3,1,9,2,0,7,6,3,4,2,8,1,0,6,4,1,7,9,0,3,3,9,4,3,8,2,8,3,5,5,7,8,9,8,9,2,4,0,6,9,4,8,8,0,5,8,1,8,0,5,0,6,2,8,9,6,3,7,5,7,7,1,7,1,6,7,0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,0,5,1,5,9,5,7,8,1,3,1,7,7,1,6,0,9,1,8,4,4,9,8,9,8,6,9,4,2,3,8,3,0,9,7,5,1,4,1,7,1,6,7,4,9,4,3,6,2,3,9,5,5,4,2,1,5,6,8,8,3,3,8,2,2,7,5,1,0,9,2,2,8,6,7,0,4,6,4,6,2,3,6,0,2,1,5,7,8,4,9,7,2,2,7,0,6,0,5,8,6,9,1,7,8,7,6,7,9,2,4,7,4,4,2,6,7,8,1,0,1,2,1,7,9,8,5,0,3,1,4,3,6,9,4,0,0,3,5,5,4,4,7,8,8,8,9,5,7,5,1,1,5,0,2,2,9,8,4,2,4,5,7,2,3,6,5,1,6,0,2,4,7,1,8,6,1,7,6,3,0,0,5,4,5,9,4,6,5,1,1,3,8,0,3,9,9,0,5,9,3,7,0,5,2,5,7,7,9,7,6,1,6,7,1,1,1,1,9,3,3,8,7,7,6,9,2,9,9,9,0,7,0,9,3,8,5,0,7,9,0,1,6,5,3,4,8,2,5,9,9,5,9,5,2,1,4,1,6,7,7,5,6,7,6,9,3,6,3,7,2,0,9,5,1,8,5,2,8,1,8,8,8,2,8,5,8,3,5,9,5,3,2,2,9,7,5,1,3,1,0,9,3,8,0,9,1,1,3,4,8,2,8,6,9,3,2,5,5,1,7,6,0,3,0,8,1,3,9,4,6,1,3,9,0,2,2,4,0,7,0,4,7,7,8,7,9,2,4,0,4,7,4,8,2,1,0,2,7,8,0,9,4,5,8,2,2,0,1,3,0,8,5,5,8,0,8,2,7,4,7,8,1,8,4,8,4,2,7,8,4,4,8,0,2,2,5,6,7,1,0,7,3,6,3,6,7,3,6,2,5,0,6,4,0,6,4,5,5,4,0,9,3,9,2,9,6,9,5,2,0,4,9,5,7,6,8,0,8,5,5,0,2,4,5,0,7,5,5,4,2,2,0,2,3,4,9,9,4,0,8,4,9,6,2,9,8,9,5,6,7,0,2,1,7,5,7,9,7,3,6,6,3,6,0,2,0,1,7,7,4,1,4,2,9,3,3,5,2,5,8,7,4,7,8,8,3,6,5,6,5,3,4,4,5,1,5,3,0,5,6,2,8,4,1,1,2,8,0,4,7,0,9,9,6,7,9,2,6,1,6,7,9,8,7,8,2,1,6,7,7,9,1,2,3,1,9,1,3,6,1,5,3,5,8,0,9,6,6,3,8,1,3,1,8,6,2,6,9,6,7,3,6,4,2,3,2,6,7,2,9,3,0,8,3,9,0,3,0,7,6,1,0,4,9,8,0,0,9,9,5,0,4,2,6,4,2,8,3,0,7,8,1,8,5,4,8,5,6,5,7,4,0,6,6,6,7,6,4,4,7,6,5,3,3,7,5,0,1,8,7,8,5,0,5,3,8,4,5,6,1,2,7,2,7,6,4,8,5,5,0,5,9,2,4,6,7,8,2,9,4,6,6,4,6,6,4,0,8,0,7,1,8,6,4,9,5,3,5,1,9,6,7,7,3,4,5,7,6,5,2,3,9,9,6,3,4,6,3,6,4,9,0,3,3,6,6,0,6,3,3,4,0,1,0,2,1,2,8,8,8,2,1,7,6,2,6,7,4,6,9,8,8,8,9,2,5,7,0,2,7,4,6,9,0,1,6,8,6,3,9,7,1,8,0,8,4,3,5,1,4,0,3,5,0,7,1,1,3,4,0,5,5,8,6,1,1,3,4,4,7,4,2,8,1,9,6,5,0,0,5,0,7,2,2,2,3,2,0,8,2,2,3,0,6,4,4,1,2,6,3,0,3,7,8,9,0,0,2,6,2,1,2,5,1,0,7,6,5,7,7,8,9,8,4,5,2,1,1,7,9,0,2,8,8,8,1,2,0,3,7,9,6,2,2,4,3,2,0,7,8,8,0,5,9,1,6,6,9,3,1,6,0,9,3,1,2,4,9,8,8,2,2,2,8,1,8,3,1,9,3,6,4,5,5,8,3,6,4,3,7,7,7,1,6,0,8,6,9,1,7,7,0,1,0,4,1,9,7,5,3,7,0,3,0,6,5,0,6,5,1,3,7,0,6,7,7,8,8,2,0,1,8,0,0,2,5,2,9,3,0,8,8,4,8,9,1,7,3,4,2,3,4,6,4,1,9,2,5,5,3,0,8,1,6,5,2,9,4,3,1,6,7,0,0,9,1,2,6,6,5,1,7,4,0,6,9,9,7,8,3,7,9,5,7,6,4,7,0,1,4,2,4,1,4,8,2,5,6,1,8,6,4,8,9,6,5,4,0,5,1,7,0,8,7,1,5,0,0,3,6,0,6,8,3,3,1,6,7,0,9,7,0,9,1,8,7,0,8,4,1,4,7,0,0,4,7,4,9,3,7,1,3,3,7,5,2,7,8,9,7,1,7,9,6,7,5,8,1,4,2,6,5,8,2,7,6,0,2,7,8,5,2,3,8,4,8,4,3,3,6,3,2,2,5,4,9,6,2,6,0,4,8,9,7,5,1,2,5,6,6,8,8,2,7,1,8,3,1,2,6,4,2,6,3,4,6,5,8,3,3,7,5,0,9,6,5,3,8,4,3,5,7,1,5,6,2,9,4,0,7,1,0,6,9,4,3,9,2,3,5,9,9,4,4,1,9,0,9,4,7,5,1,8,6,1,8,4,5,6,5,8,2,0,1,6,7,4,6,8,4,4,2,5,4,3,6,3,9,1,5,7,2,4,6,1,5,7,2,1,1,0,7,0,0,4,9,0,4,4,2,2,8,9,9,1,1,4,3,5,9,3,6,0,6,3,3,7,7,3,6,1,6,3,6,0,4,2,6,7,8,7,5,0,4,7,7,4,6,7,6,3,4,8,3,2,9,5,5,8,0,9,3,3,7,7,1,6,3,6,4,7,0,1,7,7,2,7,3,0,9,8,1,4,0,3,6,7,0,0,6,9,9,5,8,5,2,5,8,2,3,6,7,3,5,8,7,0,1,9,8,6,7,1,2,1,5,0,2,8,2,6,9,5,2,2,7,4,6,5,4,7,4,3,7,3,3,8,6,7,3,2,5,4,1,6,4,6,9,9,4,2,4,5,7,7,0,7,9,9,0,1,5,0,7,2,6,0,0,4,5,9,1,1,3,9,4,1,5,1,4,3,5,1,9,5,4,9,7,6,3,5,5,4,2,0,4,5,1,1,8,3,2,7,5,7,1,8,6,0,0,7,8,8,1,3,7,2,9,6,7,8,7,5,7,5,1,6,5,1,0,7,1,9,7,2,9,1,8,3,2,3,5,1,6,5,5,9,4,4,4,5,7,0,8,0,1,3,4,9,9,3,8,9,0,5,4,0,5,3,2,9,0,5,1,4,9,6,2,3,0,7,5,1,0,3,7,3,5,9,9,4,6,4,6,6,4,7,4,7,9,2,3,3,8,1,6,0,9,1,5,7,7,6,7,1,2,9,5,8,5,3,1,2,3,7,7,0,5,9,6,2,5,5,4,8,1,1,5,4,0,9,3,7,7,2,8,9,6,6,9,6,2,3,3,4,8,4,2,4,0,5,8,8,4,1,0,9,8,5,6,6,5,9,5,2,5,2,9,5,2,6,9,2,5,2,3,0,9,8,6,8,8,6,5,6,0,3,8,5,7,6,5,4,8,0,1,6,9,8,9,8,3,5,3,7,5,4,7,3,3,2,4,9,5,4,0,8,3,4,7,4,0,6,6,4,4,2,8,3,9,4,7,6,0,0,2,3,0,1,3,1,2,0,9,6,3,9,6,7,1,7,9,5,2,7,5,2,9,7,0,9,1,4,9,2,9,1,5,5,4,4,4,1,7,5,5,8,9,0,6,7,4,6,7,1,5,8,1,3,0,2,2,3,7,8,8,3,9,1,3,9,7,7,1,3,3,0,8,4,0,7,4,3,3,5,1,4,8,4,9,9,1,9,0,5,1,2,6,3,9,8,1,5,8,7,1,1,2,5,2,7,7,6,7,2,4,0,7,3,5,1,3,4,7,8,1,2,9,1,9,5,4,4,3,8,1,3,0,2,5,5,3,4,3,4,4,0,4,9,9,5,8,4,9,9,3,8,1,3,8,8,2,5,0,1,1,1,3,9,1,6,4,3,8,7,8,6,1,0,7,2,5,1,3,3,3,0,5,9,2,9,0,8,1,8,4,6,4,5,6,4,1,7,8,5,4,5,0,3,7,0,4,8,2,5,7,8,1,5,0,5,7,5,6,1,3,9,0,2,9,9,5,1,9,2,0,8,4,7,0,8,6,2,5,7,4,9,1,4,2,7,0,5,6,3,4,9,5,1,0,2,6,7,2,1,8,4,1,4,3,2,1,5,1,7,6,7,6,6,9,4,0,0,2,1,7,8,6,5,0,6,2,4,7,8,1,4,8,2,4,7,0,0,0,6,4,4,4,5,9,0,0,0,7,0,0,4,6,6,0,6,9,3,8,6,6,5,6,8,5,3,6,1,8,3,5,0,7,8,8,1,6,3,1,9,5,0,9,9,0,0,4,7,2,9,3,1,8,4,3,6,9,9,4,4,3,8,6,0,7,4,4,5,2,4,0,1,6,9,2,1,9,8,5,9,7,3,4,0,1,9,8,9,6,2,3,1,4,0,2,4,6,2,4,6,2,1,3,2,7,4,2,3,8,4,1,4,5,4,7,7,9,5,3,3,6,9,2,6,7,2,3,0,2,7,0,8,2,5,3,7,4,0,2,8,2,4,3,9,4,6,8,8,4,4,1,3,4,7,9,6,5,6,5,9,0,9,5,2,2,0,8,8,4,7,0,5,7,5,2,9,5,9,9,0,9,4,9,4,4,0,0,0,2,7,8,2,6,7,3,5,1,4,2,3,2,4,3,1,6,7,1,3,1,4,1,8,5,7,3,4,8,9,9,3,1,8,9,3,4,9,0,6,7,0,5,8,7,5,8,4,8,2,3,1,1,6,5,9,0,7,5,7,9,4,9,9,6,2,1,3,0,4,9,0,6,1,7,9,4,7,5,6,6,9,7,5,6,5,3,3,4,0,0,9,8,1,6,7,9,6,1,9,0,1,7,7,1,9,6,6,0,9,7,1,2,7,9,9,3,7,8,0,3,1,3,0,1,4,5,0,6,4,3,1,3,6,3,8,9,4,8,5,4,6,8,8,5,0,3,3,2,0,5,8,0,3,3,6,4,3,5,8,2,8,4,2,7,6,6,8,3,1,1,5,7,4,1,1,3,6,9,6,9,2,7,7,0,3,7,8,4,2,3,2,7,0,2,7,2,8,7,5,5,1,4,3,5,4,9,8,2,7,8,7,7,2,2,3,3,2,0,4,3,9,4,9,4,1,5,8,1,3,9,9,4,5,1,8,3,8,3,1,5,4,9,8,0,9,5,9,9,4,1,8,4,1,1,4,8,8,5,6,3,8,7,4,7,3,5,5,6,5,7,7,6,4,8,1,3,8,1,9,9,0,3,3,2,1,7,7,9,1,9,6,0,4,7,6,0,3,8,4,8,3,0,0,5,8,9,4,5,2,0,1,9,2,3,1,0,5,1,9,2,9,5,1,9,0,4,9,8,2,7,3,8,7,5,5,5,7,3,1,9,9]))
from utils import TreeNode
class Solution(object):
def sumNumbers(self, root):
"""
:type root: TreeNode
:rtype: int
"""
if root is None:
return 0
current_level = [(root, 0)]
s = 0
while current_level:
next_level = []
for node, val in current_level:
pivot = val * 10 + node.val
if node.left:
next_level.append((node.left, pivot))
if node.right:
next_level.append((node.right, pivot))
if node.left == node.right == None:
s += pivot
current_level = next_level
return s
if __name__ == '__main__':
print Solution().sumNumbers(TreeNode.build_by_level_order([1,2,3]))
print Solution().sumNumbers(TreeNode.build_by_level_order([1]))
def flatten(self, root):
"""
:type root: TreeNode
:rtype: void Do not return anything, modify root in-place instead.
"""
stack = [root]
while stack:
node = stack.pop()
if node.right:
stack.append(node.right)
node.right = None
if node.left:
stack.append(node.left)
node.left = None
node.right = stack[-1] if stack else None
return
if __name__ == '__main__':
root = TreeNode(1)
root.left = TreeNode(2)
root.left.left = TreeNode(3)
root.left.right = TreeNode(4)
root.right = TreeNode(5)
root.right.right = TreeNode(6)
inorder_traversal(root)
sln = Solution()
sln.flatten(root)
inorder_traversal(root)
if T2 is a sub-tree of T1.
"""
def is_subtree(T1, T2):
# Empty tree is *always* subset of another tree
if T2 is None:
return True
# We've gone through both trees and ended at same time, means it's same
if T1 is None and T2 is None:
return True
# If either one finishes first, then it's not the same
if T1 is None or T2 is None:
return False
return is_subtree(T1.left, T2.left) and is_subtree(T1.right, T2.right)
subtree = find_node(T1, T2.data)
# We couldn't find the node
if not subtree:
return False
return is_subtree(subtree, T2)
if __name__ == '__main__':
tree = TreeNode(5, TreeNode(1), TreeNode(10))
root = TreeNode(100)
root.left = tree
another = TreeNode(5, TreeNode(1), TreeNode(10))
print(find_node(root, 5))
if not node:
return None, None
left_min, left_max = dfs(node.left)
right_min, right_max = dfs(node.right)
node.left = None
node.right = left_min or right_min
if left_max:
left_max.right = right_min
return node, right_max or left_max or node
dfs(root)
if __name__ == "__main__":
from utils import TreeNode
n1 = TreeNode(1)
n2 = TreeNode(2)
n3 = TreeNode(3)
n1.left = n2
n1.right = n3
Solution().flatten(n1)
assert n1.right is n2
assert n1.left is None
assert n2.left is None
assert n2.right is n3
assert n3.left is None and n3.right is None
from bisect import bisect_left, bisect_right
previous = []
res = maxsize
def minDiffBT(root):
if not root: return
minDiffBT(root.left)
global res, previous
if previous:
floor = bisect_left(previous, root.val) # find the insert position
print(f"val: {root.val}, floor: {floor}, previous: {previous}")
if floor != len(previous): # if the insert position is within the index range
res = min(res, abs(root.val - previous[floor]))
else: # if the insert position pass the index range
res = min(res, abs(root.val - previous[floor-1]))
if floor + 1 < len(previous): # also check the potential bigger elements
res = min(res, abs(previous[floor+1] - root.val))
previous = previous[:floor] + [root.val] + previous[floor:] # insert the current element
else:
previous.append(root.val)
print(f"min res: {res}")
minDiffBT(root.right)
# testing
t1 = TreeNode(1)
t2 = TreeNode(3)
t3 = TreeNode(6)
t2.left = t3
t2.right = t1
minDiffBT(t2)
print(f"min diff in BT: {res}")
class Solution(object):
def minDepth(self, root):
"""
:type root: TreeNode
:rtype: int
"""
def min_depth(root, level):
if root.left is None and root.right is None:
return level
elif root.left is None:
return min_depth(root.right, level+1)
elif root.right is None:
return min_depth(root.left, level+1)
else:
return min([min_depth(root.left, level+1), min_depth(root.right, level+1)])
return min_depth(root, 1) if root else 0
if __name__ == '__main__':
print Solution().minDepth(TreeNode.build_by_level_order([1, 2, 2, 3, 4, 4, 3]))
print Solution().minDepth(TreeNode.build_by_level_order([1, 2, '#']))
print Solution().minDepth(TreeNode.build_by_level_order([1, 2, 2, '#', 3, '#', 3]))
print Solution().minDepth(TreeNode.build_by_level_order([1]))
print Solution().minDepth(TreeNode.build_by_level_order([6,82,82,'#',53,53,'#',-58,'#','#',-58,'#',-85,-85,'#',-9,'#','#',-9,'#',48,48,'#',33,'#','#',33,81,'#','#',81,5,'#','#',5,61,'#','#',61,'#',9,9,'#',91,'#','#',91,72,7,7,72,89,'#',94,'#','#',94,'#',89,-27,'#',-30,36,36,-30,'#',-27,50,36,'#',-80,34,'#','#',34,-80,'#',36,50,18,'#','#',91,77,'#','#',95,95,'#','#',77,91,'#','#',18,-19,65,'#',94,'#',-53,'#',-29,-29,'#',-53,'#',94,'#',65,-19,-62,-15,-35,'#','#',-19,43,'#',-21,'#','#',-21,'#',43,-19,'#','#',-35,-15,-62,86,'#','#',-70,'#',19,'#',55,-79,'#','#',-96,-96,'#','#',-79,55,'#',19,'#',-70,'#','#',86,49,'#',25,'#',-19,'#','#',8,30,'#',82,-47,-47,82,'#',30,8,'#','#',-19,'#',25,'#',49]))
print Solution().minDepth(TreeNode.build_by_level_order([2,3,3,4,5,'#',4]))
print Solution().minDepth(TreeNode.build_by_level_order([2,3,3,4,5,'#','#']))
print Solution().minDepth(TreeNode.build_by_level_order([2,3,3,4,5,5,4,'#','#',8,9,'#','#',9,8]))
from utils import TreeNode, ListNode
class Solution(object):
def sortedListToBST(self, head):
"""
:type head: ListNode
:rtype: TreeNode
"""
if head is None:
return None
fast, prev, slow = head, None, head
while fast and fast.next:
fast = fast.next.next
prev, slow = slow, slow.next
root = TreeNode(slow.val)
if prev:
prev.next = None
else:
return root
root.left = self.sortedListToBST(head)
root.right = self.sortedListToBST(slow.next)
return root
if __name__ == '__main__':
TreeNode.print_in_level_order(Solution().sortedListToBST(ListNode.build_linked_list([1,2])))
TreeNode.print_in_level_order(Solution().sortedListToBST(ListNode.build_linked_list([1])))
TreeNode.print_in_level_order(Solution().sortedListToBST(ListNode.build_linked_list([1,2,3,4,5,6])))
TreeNode.print_in_level_order(Solution().sortedListToBST(ListNode.build_linked_list([1,2,3,4,5])))
TreeNode.print_in_level_order(Solution().sortedListToBST(ListNode.build_linked_list([])))
__author__ = 'clp'
from utils import TreeNode
class Solution(object):
def invertTree(self, root):
"""
:type root: TreeNode
:rtype: TreeNode
"""
def invert_tree(root):
if root is None:
return None
root.left, root.right = root.right, root.left
invert_tree(root.left)
invert_tree(root.right)
if root:
invert_tree(root)
return root
if __name__ == '__main__':
TreeNode.print_in_level_order(Solution().invertTree(TreeNode.build_by_level_order([4, 2, 7, 1, '#',6,9])))
TreeNode.print_in_level_order(Solution().invertTree(TreeNode.build_by_level_order([])))
while node or st:
if node:
st.append(node)
if not node.left and not node.right:
nodes.append(node)
node = node.left
else:
node = st.pop()
node = node.right
# get the right boundary
rights = []
while right and (right.left or right.right):
rights.append(right)
if right.right:
right = right.right
else:
right = right.left
nodes.extend(rights[::-1])
return nodes
# testing
from utils import TreeNode
n1 = TreeNode(1)
n2 = TreeNode(2)
n3 = TreeNode(3)
n4 = TreeNode(4)
n1.right = n2
n2.left = n3
n2.right = n4
nodes = boundaryOfBinaryTree_2(n1)
print(f"{[n.val for n in nodes]}")
def test_chapter4_8(root, left, right, parent):
tree = TreeNode(root, TreeNode(left), TreeNode(right))
root = TreeNode(parent)
root.left = tree
assert chapter4.prob4_8(root, tree) is True
class Solution(object):
def maxDepth(self, root):
"""
:type root: TreeNode
:rtype: int
"""
if root is None:
return 0
return max(self.maxDepth(root.left), self.maxDepth(root.right)) + 1
if __name__ == "__main__":
print Solution().maxDepth(TreeNode.build_by_level_order([1, 2, 2, 3, 4, 4, 3]))
print Solution().maxDepth(TreeNode.build_by_level_order([1, 2, "#"]))
print Solution().maxDepth(TreeNode.build_by_level_order([1, 2, 2, "#", 3, "#", 3]))
print Solution().maxDepth(TreeNode.build_by_level_order([1]))
print Solution().maxDepth(
TreeNode.build_by_level_order(
[
6,
82,
82,
"#",
53,
53,
"#",
-58,
"#",