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Author: yeonjiyeon

104-maximum-depth-of-binary-tree/104-maximum-depth-of-binary-tree.java

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+/**
+ * Definition for a binary tree node.
+ * public class TreeNode {
+ *     int val;
+ *     TreeNode left;
+ *     TreeNode right;
+ *     TreeNode() {}
+ *     TreeNode(int val) { this.val = val; }
+ *     TreeNode(int val, TreeNode left, TreeNode right) {
+ *         this.val = val;
+ *         this.left = left;
+ *         this.right = right;
+ *     }
+ * }
+ */
+class Solution {
+    public int maxDepth(TreeNode root) {
+        
+        if(root == null) return 0;
+        
+        int left = maxDepth(root.left);
+        int right = maxDepth(root.right);
+        
+        return Math.max(left, right) + 1;
+        
+        
+    }
+}