LeetCode 235. Lowest Common Ancestor of a Binary Search Tree
題目 思路 兩個值都小於根節點值，則在左子樹中遞歸找公共根節點 兩個值都大於根節點值，則值右子樹中遞歸找公共根節點 一個大於等於根節點值，一個小於等於根節點值，則公共根節點爲root本身。 代碼 class Solution:
def lowestCommonAncestor(self, root: 'TreeNode', p: 'TreeNode', q: 'TreeNode') ->
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