Create 0236-lowest-common-ancestor-of-a-binary-tree.java

Author: a93a

Diff for: Grind 75 in Java/0236-lowest-common-ancestor-of-a-binary-tree.java

@@ -0,0 +1,13 @@
+class Solution {
+    public TreeNode lowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q) {
+        if (root == null) return null;
+        if (p == root || q == root) return root;
+
+        TreeNode left = lowestCommonAncestor(root.left, p, q);
+        TreeNode right = lowestCommonAncestor(root.right, p, q);
+
+        if (left != null && right != null) return root;
+        else if (left != null) return left;
+        else return right;
+    }
+}