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test44.java
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37 lines (34 loc) · 1.01 KB
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package byteDance;
/**
* Created by lizeyang on 2020/5/16.
* 二叉树的最近公共祖先
*/
public class test44 {
public static TreeNode test(TreeNode root, TreeNode p, TreeNode q) {
if (root == null || root == p || root == q) {
return root;
}
TreeNode left = test(root.left, p, q);
TreeNode right = test(root.right, p, q);
if (left != null && right != null) {
return root;
}
if (left == null) {
return right;
}
if (right == null) {
return left;
}
return null;
}
public static void main(String[] args) {
TreeNode root = new TreeNode(5);
root.left = new TreeNode(4);
root.right = new TreeNode(8);
root.left.left = new TreeNode(3);
root.right.left = new TreeNode(7);
root.right.left.left = new TreeNode(6);
root.right.right = new TreeNode(9);
System.out.println(test(root, root.right, root.left.left).val);
}
}