235. Lowest Common Ancestor of a Binary Search Tree
2017-08-09 00:00
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Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST.
According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes v and w as the lowest node in T that has both v and w as descendants (where we allow a node to be a descendant of itself).”
For example, the lowest common ancestor (LCA) of nodes
According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes v and w as the lowest node in T that has both v and w as descendants (where we allow a node to be a descendant of itself).”
_______6______ / \ ___2__ ___8__ / \ / \ 0 _4 7 9 / \ 3 5
For example, the lowest common ancestor (LCA) of nodes
2and
8is
6. Another example is LCA of nodes
2and
4is
2, since a node can be a descendant of itself according to the LCA definition.
public TreeNode lowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q) { if((root.val>p.val && root.val>q.val)){ return lowestCommonAncestor(root.left, p, q); } if((root.val<p.val && root.val<q.val)){ return lowestCommonAncestor(root.right, p, q); } return root; }
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