Create Sunny.md

sunny-ljc · web-flow · commit df5316b769d4 · 2018-12-05T10:52:37.000-05:00
diff --git a/2018.12.05-leetcode102/Sunny.md b/2018.12.05-leetcode102/Sunny.md
@@ -0,0 +1,22 @@
+```java
+class Solution {
+    
+    private List<List<Integer>> result = new ArrayList<>();
+
+    public List<List<Integer>> levelOrder(TreeNode root) {
+        levelOrder(root, 0);
+        return result;
+    }
+    
+    public void levelOrder(TreeNode node, int level) {
+        if (node != null) {
+            if (result.size() <= level) {
+                result.add(new ArrayList<Integer>());
+            }
+            result.get(level).add(node.val);
+            levelOrder(node.left, level+1);
+            levelOrder(node.right, level+1);
+        }
+    }
+}
+```
