def test_case3(self):
nums = [6,5,8,1,3,7,11,None,None,None,None,None,None,9]
answer = [6,3,8,1,5,7,11,None,None,None,None,None,None,9]
root = TreeNode.generate_bt_from_list(nums)
self.sol.recoverTree(root)
compare = TreeNode.compare_tree(root, TreeNode.generate_bt_from_list(answer))
self.assertTrue(compare)
def test_case2(self):
nums = [1,2]
root = TreeNode.generate_bt_from_list(nums)
answer = [1,2]
self.sol.flatten(root)
result = TreeNode.get_tree_right_list(root)
self.assertEqual(answer, result)
def test_case1(self):
nums = [3,1,2]
answer = [2,1,3]
root = TreeNode.generate_bt_from_list(nums)
self.sol.recoverTree(root)
compare = TreeNode.compare_tree(root, TreeNode.generate_bt_from_list(answer))
self.assertTrue(compare)
def test_case1(self):
nums = [1, 2, 5, 3, 4, None, 6]
root = TreeNode.generate_bt_from_list(nums)
answer = [1, 2, 3, 4, 5, 6]
self.sol.flatten(root)
result = TreeNode.get_tree_right_list(root)
self.assertEqual(answer, result)
def test_case1(self):
nums = [1, 2, 3, 4, 5]
#answer = [3,1,4,None,2, None,5] # -- array way
answer = [3, 2, 5, 1, None, 4] # -- list way
result = self.sol.sortedListToBST(ListNode.parseArray2List(nums))
self.assertEqual(
True,
TreeNode.compare_tree(result,
TreeNode.generate_bt_from_list(answer)))
def test_case11(self): #===>
nums = "98,97,#,88,#,84,#,79,87,64,#,#,#,63,69,62,#,#,#,30,#,27,59,9,#,#,#,3,#,0,#,-4,#,-16,#,-18,-7,-19,#,#,#,-23,#,-34,#,-42,#,-59,#,-63,#,-64,#,-69,#,-75,#,-81"
answer = "98,#,97,#,88,#,84,#,79,#,64,#,63,#,62,#,30,#,27,#,9,#,3,#,0,#,-4,#,-16,#,-18,#,-19,#,-23,#,-34,#,-42,#,-59,#,-63,#,-64,#,-69,#,-75,#,-81,#,-7,#,59,#,69,#,87"
from util.tree_node import TreeNode
root = TreeNode.generate_bt_from_string_standard(nums)
answer_tree = TreeNode.generate_bt_from_string_standard(answer)
self.sol.flatten(root)
compare = TreeNode.compare_tree(root, answer_tree)
self.assertTrue(compare)
def test_case11(self): #===>
nums = "98,97,#,88,#,84,#,79,87,64,#,#,#,63,69,62,#,#,#,30,#,27,59,9,#,#,#,3,#,0,#,-4,#,-16,#,-18,-7,-19,#,#,#,-23,#,-34,#,-42,#,-59,#,-63,#,-64,#,-69,#,-75,#,-81"
answer = "98,#,97,#,88,#,84,#,79,#,64,#,63,#,62,#,30,#,27,#,9,#,3,#,0,#,-4,#,-16,#,-18,#,-19,#,-23,#,-34,#,-42,#,-59,#,-63,#,-64,#,-69,#,-75,#,-81,#,-7,#,59,#,69,#,87"
from util.tree_node import TreeNode
root = TreeNode.generate_bt_from_string_standard(nums)
answer_tree = TreeNode.generate_bt_from_string_standard(answer)
self.sol.flatten(root)
compare = TreeNode.compare_tree(root, answer_tree)
self.assertTrue(compare)
def test_case1(self):
preorder = "abc"
inorder = "bac"
answer = TreeNode("a")
answer.left = TreeNode("b")
answer.right = TreeNode("c")
result = self.sol.buildTree(preorder, inorder)
compare = TreeNode.compare_tree(answer, result)
self.assertTrue(compare)
def gen_tree(self, nums, left, right):
if left > right:
return None
if left == right:
return TreeNode(nums[left])
mid = left + int((right - left) / 2)
root = TreeNode(nums[mid])
root.left = self.gen_tree(nums, left, mid - 1)
root.right = self.gen_tree(nums, mid + 1, right)
return root
def helper(self, left, right):
if left>right:
return None
if left==right:
return TreeNode(self.nums[left])
mid = (left+right) / 2
root = TreeNode(self.nums[mid])
root.left = self.helper(left, mid-1)
root.right = self.helper(mid+1, right)
return root
def gen_tree(self, nums, left, right):
if left > right:
return None
if left == right:
return TreeNode(nums[left])
mid = left + int((right - left) / 2)
root = TreeNode(nums[mid])
root.left = self.gen_tree(nums, left, mid - 1)
root.right = self.gen_tree(nums, mid + 1, right)
return root
def helper(self, left, right):
if left > right:
return None
if left == right:
return TreeNode(self.nums[left])
mid = (left + right) / 2
root = TreeNode(self.nums[mid])
root.left = self.helper(left, mid - 1)
root.right = self.helper(mid + 1, right)
return root
def __delete(self, node: TreeNode, index, item):
if node is None:
return node
if item < node.value:
node.left = self.__delete(node.left, index, item)
elif item > node.value:
node.right = self.__delete(node.right, index, item)
elif index != node.index:
node.left = self.__delete(node.left, index, item)
node.right = self.__delete(node.right, index, item)
else:
if node.left is None or node.right is None:
tmp_node = None
if tmp_node == node.left:
tmp_node = node.right
else:
tmp_node = node.left
if tmp_node is None:
tmp_node = node
node = None
else:
node = tmp_node
else:
tmp_node = self.__min_value_node(node.right)
TreeNode.copy_to(tmp_node, node)
node.right = self.__delete(node.right, tmp_node.index,
tmp_node.value)
if node is None:
return node
node.height = max(self.__height(node.left), self.__height(
node.right)) + 1
balance = self.__balance(node)
if balance > 1 and self.__balance(node) >= 0:
return self.__right_rotate(node)
if balance > 1 and self.__balance(node.left) < 0:
node.left = self.__left_rotate(node.left)
return self.__right_rotate(node)
if balance < -1 and self.__balance(node.right) <= 0:
return self.__left_rotate(node)
if balance < -1 and self.__balance(node.right) > 0:
node.right = self.__right_rotate(node.right)
return self.__left_rotate(node)
self.__ajust_min_index(node)
return node
def generateBST(self, head, start, end):
if start>end:
return None
mid = start + (end-start)/2
left = self.generateBST(head, start, mid-1)
root = TreeNode(head[0].val)
head[0] = head[0].next
right = self.generateBST(head, mid+1, end)
root.left = left
root.right = right
return root
def build_max(self, A, start, end):
if start > end:
return None
idx = start
for i in range(start, end+1):
if A[i] > A[idx]:
idx = i
root = TreeNode(A[idx])
root.left = self.build_max(A, start, idx-1)
root.right = self.build_max(A, idx+1, end)
return root
def build_max(self, A, start, end):
if start > end:
return None
idx = start
for i in range(start, end + 1):
if A[i] > A[idx]:
idx = i
root = TreeNode(A[idx])
root.left = self.build_max(A, start, idx - 1)
root.right = self.build_max(A, idx + 1, end)
return root
def helper(self, preorder, inorder, l1, r1, l2, r2):
if l1 > r1:
return None
root = TreeNode(preorder[l1])
idx = l2
while idx <= r2 and inorder[idx] != preorder[l1]:
idx += 1
lsize = idx - l2
root.left = self.helper(preorder, inorder, l1 + 1, l1 + lsize, l2, idx)
root.right = self.helper(preorder, inorder, l1 + lsize + 1, r1, idx + 1, r2)
return root
def generateBST(self, head, start, end):
if start > end:
return None
mid = start + (end - start) / 2
left = self.generateBST(head, start, mid - 1)
root = TreeNode(head[0].val)
head[0] = head[0].next
right = self.generateBST(head, mid + 1, end)
root.left = left
root.right = right
return root
def arr_to_tree(self, arr, left, right):
if not arr:
return None
if left==right:
return TreeNode(arr[left])
if left>right:
return None
mid = (left+right)/2
root = TreeNode(arr[mid])
root.left = self.arr_to_tree(arr,left,mid-1)
root.right = self.arr_to_tree(arr,mid+1,right)
return root
def helper(self, preorder, inorder, l1, r1, l2, r2):
if l1 > r1:
return None
root = TreeNode(preorder[l1])
idx = l2
while idx <= r2 and inorder[idx] != preorder[l1]:
idx += 1
lsize = idx - l2
root.left = self.helper(preorder, inorder, l1 + 1, l1 + lsize, l2, idx)
root.right = self.helper(preorder, inorder, l1 + lsize + 1, r1,
idx + 1, r2)
return root
def build_tree_rec(self, root_idx, in_left, in_right):
if in_left > in_right:
return None
root = TreeNode(self.preorder[root_idx])
if in_left == in_right:
return root
in_root = self.inorder.index(self.preorder[root_idx])
left_length = in_root - in_left
right_length = in_right - in_root
root.left = self.build_tree_rec(root_idx+1, in_root-left_length, in_root-1)
root.right = self.build_tree_rec(root_idx+1+left_length,in_root+1,in_right)
return root
def helper(self, inorder, left, right, postorder, pl, pr):
if left>right: #need this, otherwise wrong for case1
return None
if left == right:
return TreeNode(inorder[left])
root_val = postorder[pr]
root = TreeNode(root_val)
root_idx = inorder.index(root_val)
right_len = right-root_idx
root.left = self.helper(inorder, left, root_idx-1, postorder, pl, pr-right_len-1)
root.right = self.helper(inorder, root_idx+1, right, postorder, pr-right_len, pr-1)
return root
def arr_to_tree(self, arr, left, right):
if not arr:
return None
if left == right:
return TreeNode(arr[left])
if left > right:
return None
mid = (left + right) / 2
root = TreeNode(arr[mid])
root.left = self.arr_to_tree(arr, left, mid - 1)
root.right = self.arr_to_tree(arr, mid + 1, right)
return root
def maxTree(self, A): # ref, use stack to track the decreasing part
if not A:
return None
stack = []
for i in range(len(A)):
cur = TreeNode(A[i])
while stack and stack[-1].val < cur.val: # if use if here, wrong for case 1
cur.left = stack.pop()
if stack:
stack[-1].right = cur
stack.append(cur)
return stack[0]
def helper(self, head, tail):
if head==tail:
return None
fast = head
slow = head
while fast.next != tail and fast.next.next!=tail:
fast = fast.next.next
slow = slow.next
root = TreeNode(slow.val)
root.left = self.helper(head, slow)
root.right = self.helper(slow.next, tail)
return root
def helper(self, head, tail):
if head == tail:
return None
fast = head
slow = head
while fast.next != tail and fast.next.next != tail:
fast = fast.next.next
slow = slow.next
root = TreeNode(slow.val)
root.left = self.helper(head, slow)
root.right = self.helper(slow.next, tail)
return root
def maxTree(self, A): # ref, use stack to track the decreasing part
if not A:
return None
stack = []
for i in range(len(A)):
cur = TreeNode(A[i])
while stack and stack[
-1].val < cur.val: # if use if here, wrong for case 1
cur.left = stack.pop()
if stack:
stack[-1].right = cur
stack.append(cur)
return stack[0]
def to_bst(self, head, tail):
if head is None or head==tail: # should move head==tail here, because tail is not included, otherwise wrong.
return None
elif head.next == tail:
return TreeNode(head.val)
fast = slow = head
while fast != tail and fast.next!=tail:
fast = fast.next.next
slow = slow.next
root = TreeNode(slow.val)
root.left = self.to_bst(head, slow)
root.right = self.to_bst(slow.next, tail)
return root
def to_bst(self, head, tail):
if head is None or head == tail: # should move head==tail here, because tail is not included, otherwise wrong.
return None
elif head.next == tail:
return TreeNode(head.val)
fast = slow = head
while fast != tail and fast.next != tail:
fast = fast.next.next
slow = slow.next
root = TreeNode(slow.val)
root.left = self.to_bst(head, slow)
root.right = self.to_bst(slow.next, tail)
return root
def build_tree_rec(self, root_idx, in_left, in_right):
if in_left > in_right:
return None
root = TreeNode(self.preorder[root_idx])
if in_left == in_right:
return root
in_root = self.inorder.index(self.preorder[root_idx])
left_length = in_root - in_left
right_length = in_right - in_root
root.left = self.build_tree_rec(root_idx + 1, in_root - left_length,
in_root - 1)
root.right = self.build_tree_rec(root_idx + 1 + left_length,
in_root + 1, in_right)
return root
def helper(arr):
if len(arr) == 0:
return [None]
ret = []
for i in range(0, len(arr)):
left = helper(arr[:i])
right = helper(arr[i + 1:])
for j in left:
for k in right:
dummy = TreeNode(arr[i])
dummy.left = j
dummy.right = k
ret.append(dummy)
return ret
def sortedListToBSTr(self, start, end):
if start > end:
return None
# mid
mid = (start + end) / 2
left = self.sortedListToBSTr(start, mid - 1)
root = TreeNode(Solution.h.val)
Solution.h = Solution.h.next_node
right = self.sortedListToBSTr(mid + 1, end)
root.left = left
root.right = right
return root
def sortedListToBSTr(self, start, end):
if start > end:
return None
# mid
mid = (start + end) / 2
left = self.sortedListToBSTr(start, mid - 1)
root = TreeNode(Solution.h.val)
Solution.h = Solution.h.next_node
right = self.sortedListToBSTr(mid + 1, end)
root.left = left
root.right = right
return root
def test_case2(
self
): # ===> this case means that node value can be negative, and the purpose is to search a single path
root = TreeNode.generate_bt_from_string('2,#,-1,null,#')
answer = 2
result = self.sol.maxPathSum(root)
self.assertEqual(answer, result)
def dfs(self, start, end):
if start > end: return [None]
res = []
for rootval in range(start, end+1):
LeftTree = self.dfs(start, rootval-1)
RightTree = self.dfs(rootval+1, end)
for i in LeftTree:
for j in RightTree:
root = TreeNode(rootval)
root.left = i
root.right = j
res.append(root)
return res
def test_case2(self):
nums = [5, 3, 6, 2, 4, None, 7]
target = 28
root = TreeNode.generate_bt_from_list(nums)
answer = False
result = self.sol.findTarget(root, target)
self.assertEqual(answer, result)
def test_case02(self):
nums = [2,1]
k = 1
root = TreeNode.generate_bt_from_list(nums)
answer = 1
result = self.sol.kthSmallest(root, k)
self.assertEqual(answer, result)
def test_case1(self):
nums = [1,None,2]
k = 2
root = TreeNode.generate_bt_from_list(nums)
answer = 2
result = self.sol.kthSmallest(root, k)
self.assertEqual(answer, result)
def test_case1(self):
n = 22
root = TreeNode.generate_bt_from_string(
"5,#,4,8,#,11,null,13,4,#,7,2,null,null,5,1,#")
answer = [[5, 4, 11, 2], [5, 8, 4, 5]]
result = self.sol.pathSum(root, n)
self.assertEqual(answer, result)
def dfs(self, start, end):
if start > end: return [None]
res = []
for rootval in range(start, end + 1):
LeftTree = self.dfs(start, rootval - 1)
RightTree = self.dfs(rootval + 1, end)
for i in LeftTree:
for j in RightTree:
root = TreeNode(rootval)
root.left = i
root.right = j
res.append(root)
return res
def test_case3(
self
): #=====> need to check that all the vals in subtree also smaller or greater than the ROOT val!!
nums = [10, 5, 15, None, None, 6, 20]
answer = False
result = self.sol.isValidBST(TreeNode.generate_bt_from_list(nums))
self.assertEqual(answer, result)
def buildTree_mle(self, inorder, postorder): #memory limit exceed for case2
"""
:type inorder: List[int]
:type postorder: List[int]
:rtype: TreeNode
"""
if not inorder:
return None
if len(inorder) == 1:
return TreeNode(inorder[0])
root_val = postorder[-1]
root = TreeNode(root_val)
idx = inorder.index(root_val)
root.left = self.buildTree(inorder[:idx], postorder[0:idx])
root.right = self.buildTree(inorder[idx+1:], postorder[idx:-1])
return root
def dfs_gen_tree(self, start, end):
if start > end:
print "Bigger start: ", start, end
return [None] # need to be [None], not [] here
if start == end:
return [TreeNode(start)]
result = []
for i in range(start, end+1):
left_children = self.dfs_gen_tree(start, i-1)
right_children = self.dfs_gen_tree(i+1, end)
for lc in left_children:
for rc in right_children:
root = TreeNode(i)
root.left = lc
root.right =rc
result.append(root)
return result
def dfs_gen_tree(self, start, end):
if start > end:
print "Bigger start: ", start, end
return [None] # need to be [None], not [] here
if start == end:
return [TreeNode(start)]
result = []
for i in range(start, end + 1):
left_children = self.dfs_gen_tree(start, i - 1)
right_children = self.dfs_gen_tree(i + 1, end)
for lc in left_children:
for rc in right_children:
root = TreeNode(i)
root.left = lc
root.right = rc
result.append(root)
return result
def test_case2(self): #====> memory limit exceed
inorder = [
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41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,256,257,258,259,260,261,262,263,264,265,266,267,268,269,270,271,272,273,274,275,276,277,278,279,280,281,282,283,284,285,286,287,288,289,290,291,292,293,294,295,296,297,298,299,300,301,302,303,304,305,306,307,308,309,310,311,312,313,314,315,316,317,318,319,320,321,322,323,324,325,326,327,328,329,330,331,332,333,334,335,336,337,338,339,340,341,342,343,344,345,346,347,348,349,350,351,352,353,354,355,356,357,358,359,360,361,362,363,364,365,366,367,368,369,370,371,372,373,374,375,376,377,378,379,380,381,382,383,384,385,386,387,388,389,390,391,392,393,394,395,396,397,398,399,400,401,402,403,404,405,406,407,408,409,410,411,412,413,414,415,416,417,418,419,420,421,422,423,424,425,426,427,428,429,430,431,432,433,434,435,436,437,438,439,440,441,442,443,444,445,446,447,448,449,450,451,452,453,454,455,456,457,458,459,460,461,462,463,464,465,466,467,468,469,470,471,472,473,474,475,476,477,478,479,480,481,482,483,484,485,486,487,488,489,490,491,492,493,494,495,496,497,498,499,500,501,502,503,504,505,506,507,508,509,510,511,512,513,514,515,516,517,518,519,520,521,522,523,524,525,526,527,528,529,530,531,532,533,534,535,536,537,538,539,540,541,542,543,544,545,546,547,548,549,550,551,552,553,554,555,556,557,558,559,560,561,562,563,564,565,566,567,568,569,570,571,572,573,574,575,576,577,578,579,580,581,582,583,584,585,586,587,588,589,590,591,592,593,594,595,596,597,598,599,600,601,602,603,604,605,606,607,608,609,610,611,612,613,614,615,616,617,618,619,620,621,622,623,624,625,626,627,628,629,630,631,632,633,634,635,636,637,638,639,640,641,642,643,644,645,646,647,648,649,650,651,652,653,654,655,656,657,658,659,660,661,662,663,664,665,666,667,668,669,670,671,672,673,674,675,676,677,678,679,680,681,682,683,684,685,686,687,688,689,690,691,692,693,694,695,696,697,698,699,700,701,702,703,704,705,706,707,708,709,710,711,712,713,714,715,716,717,718,719,720,721,722,723,724,725,726,727,728,729,730,731,732,733,734,735,736,737,738,739,740,741,742,743,744,745,746,747,748,749,750,751,752,753,754,755,756,757,758,759,760,761,762,763,764,765,766,767,768,769,770,771,772,773,774,775,776,777,778,779,780,781,782,783,784,785,786,787,788,789,790,791,792,793,794,795,796,797,798,799,800,801,802,803,804,805,806,807,808,809,810,811,812,813,814,815,816,817,818,819,820,821,822,823,824,825,826,827,828,829,830,831,832,833,834,835,836,837,838,839,840,841,842,843,844,845,846,847,848,849,850,851,852,853,854,855,856,857,858,859,860,861,862,863,864,865,866,867,868,869,870,871,872,873,874,875,876,877,878,879,880,881,882,883,884,885,886,887,888,889,890,891,892,893,894,895,896,897,898,899,900,901,902,903,904,905,906,907,908,909,910,911,912,913,914,915,916,917,918,919,920,921,922,923,924,925,926,927,928,929,930,931,932,933,934,935,936,937,938,939,940,941,942,943,944,945,946,947,948,949,950,951,952,953,954,955,956,957,958,959,960,961,962,963,964,965,966,967,968,969,970,971,972,973,974,975,976,977,978,979,980,981,982,983,984,985,986,987,988,989,990,991,992,993,994,995,996,997,998,999,1000,1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,1011,1012,1013,1014,1015,1016,1017,1018,1019,1020,1021,1022,1023,1024,1025,1026,1027,1028,1029,1030,1031,1032,1033,1034,1035,1036,1037,1038,1039,1040,1041,1042,1043,1044,1045,1046,1047,1048,1049,1050,1051,1052,1053,1054,1055,1056,1057,1058,1059,1060,1061,1062,1063,1064,1065,1066,1067,1068,1069,1070,1071,1072,1073,1074,1075,1076,1077,1078,1079,1080,1081,1082,1083,1084,1085,1086,1087,1088,1089,1090,1091,1092,1093,1094,1095,1096,1097,1098,1099,1100,1101,1102,1103,1104,1105,1106,1107,1108,1109,1110,1111,1112,1113,1114,1115,1116,1117,1118,1119,1120,1121,1122,1123,1124,1125,1126,1127,1128,1129,1130,1131,1132,1133,1134,1135,1136,1137,1138,1139,1140,1141,1142,1143,1144,1145,1146,1147,1148,1149,1150,1151,1152,1153,1154,1155,1156,1157,1158,1159,1160,1161,1162,1163,1164,1165,1166,1167,1168,1169,1170,1171,1172,1173,1174,1175,1176,1177,1178,1179,1180,1181,1182,1183,1184,1185,1186,1187,1188,1189,1190,1191,1192,1193,1194,1195,1196,1197,1198,1199,1200,1201,1202,1203,1204,1205,1206,1207,1208,1209,1210,1211,1212,1213,1214,1215,1216,1217,1218,1219,1220,1221,1222,1223,1224,1225,1226,1227,1228,1229,1230,1231,1232,1233,1234,1235,1236,1237,1238,1239,1240,1241,1242,1243,124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answer = self.sol.buildTree_mle(inorder, postorder)
result = self.sol.buildTree(inorder, postorder)
self.assertTrue(TreeNode.compare_tree(answer, result))
def test_case4(
self
): # not necessarily rob by level, see this case, can skip the level
nums = [4, 1, None, 2, None, None, None, 3]
root = TreeNode.generate_bt_from_list(nums)
answer = 7
result = self.sol.rob(root)
self.assertEqual(answer, result)
def _add_helper(self, node, val):
if not node:
raise ValueError("Unable to attach node to None")
else:
if node.val > val:
if not node.left:
node.left = TreeNode(val)
else:
self._add_helper(node.left, val)
elif node.val < val:
if not node.right:
node.right = TreeNode(val)
else:
self._add_helper(node.right, val)
else:
raise ValueError('Node with value %s already exist in tree' %
val)
def test_case1(self):
nums = [3,9,20,None,None,15,7]
answer = [
[3],
[9,20],
[15,7]
]
result = self.sol.levelOrder(TreeNode.generate_bt_from_list(nums))
self.assertEqual(answer, result)
def buildTree_corret_but_exceed(self, preorder, inorder):# ====> Memory Limit Exceeded on case2, and local saids "maximum recursion depth exceeded", need to increase recursion limit
"""
:type preorder: List[int]
:type inorder: List[int]
:rtype: TreeNode
"""
if preorder is None or inorder is None or len(preorder) != len(inorder) or len(preorder) < 1:
return None
root = TreeNode(preorder[0])
if len(preorder) == 1:
return TreeNode(preorder[0])
idx = inorder.index(preorder[0])
left_len = idx
right_len = len(inorder) - 1 - idx
root.left = self.buildTree(preorder[1:1+left_len], inorder[0: idx])
root.right = self.buildTree(preorder[1+left_len:], inorder[idx+1:])
return root
def test_case1(self):
nums = [1,2,3,4,5]
#answer = [3,1,4,None,2, None,5] # -- array way
answer = [3,2,5,1, None,4] # -- list way
result = self.sol.sortedListToBST(ListNode.parseArray2List(nums))
self.assertEqual(True, TreeNode.compare_tree(result,TreeNode.generate_bt_from_list(answer)))
def test_case1(self):
nums = ListNode.parseArray2List([1,2,3,4,5,6,7])
answer = TreeNode.generate_bt_from_list([4,2,6,1,3,5,7])
result = self.sol.sortedListToBST(nums)
self.assertTrue(TreeNode.compare_tree(answer, result))
def test_case1(self):
A = [6,4,20]
answer = "20,6,#,#,4" # wrong output "6,#,20,4"
result = self.sol.maxTree(A)
answer_tree = TreeNode.generate_bt_from_string_standard(answer)
self.assertTrue(TreeNode.compare_tree(answer_tree, result))
