37 lines
973 B
Kotlin
37 lines
973 B
Kotlin
/**
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* Definition for a binary tree node.
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* class TreeNode(var `val`: Int = 0) {
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* var left: TreeNode? = null
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* var right: TreeNode? = null
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* }
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*/
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class Solution {
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fun lowestCommonAncestor(root: TreeNode?, p: TreeNode?, q: TreeNode?): TreeNode? {
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var ancestor: TreeNode? = null
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var pTrack = root
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var qTrack = root
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while (pTrack == qTrack && pTrack != null && qTrack != null) {
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ancestor = pTrack
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if (pTrack!!.`val` == p!!.`val`) {
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return p
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} else if (p!!.`val` < pTrack!!.`val`) {
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pTrack = pTrack.left
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} else {
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pTrack = pTrack.right
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}
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if (qTrack!!.`val` == q!!.`val`) {
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return q
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} else if (q!!.`val` < qTrack!!.`val`) {
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qTrack = qTrack.left
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} else {
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qTrack = qTrack.right
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}
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}
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return ancestor
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}
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}
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