题目：
题解：
func lowestCommonAncestor(root, p, q *TreeNode) (ancestor *TreeNode) {
ancestor = root
for {
if p.Val < ancestor.Val && q.Val < ancestor.Val {
ancestor = ancestor.Left
} else if p.Val > ancestor.Val && q.Val > ancestor.Val {
ancestor = ancestor.Right
} else {
return
}
}
}
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