Merge pull request #1 from kingemma/kingemma-patch-1

添加 0102.二叉树的层序遍历- 637.二叉树的层平均值 C# 版本

problems/0102.二叉树的层序遍历.md

@@ -1599,6 +1599,35 @@ impl Solution {
 }
 ```
 
+#### C#:
+
+```C# 二叉树的层平均值
+public class Solution {
+    public IList<double> AverageOfLevels(TreeNode root) {
+        var result= new List<double>();
+        Queue<TreeNode> queue = new();
+        if(root !=null) queue.Enqueue(root);
+        
+        while (queue.Count > 0)
+        {
+            int count = queue.Count;
+            double value=0;
+            for (int i = 0; i < count; i++)
+            {
+                var curentNode=queue.Dequeue();
+                value += curentNode.val;
+                if (curentNode.left!=null) queue.Enqueue(curentNode.left);
+                if (curentNode.right!=null) queue.Enqueue(curentNode.right);
+            }
+            result.Add(value/count);
+        }
+
+        return result;
+    }
+}
+
+```
+
 ## 429.N叉树的层序遍历
 
 [力扣题目链接](https://leetcode.cn/problems/n-ary-tree-level-order-traversal/)