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Update 404.左叶子之和，添加C#递归版

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2023-11-21 09:07:56 +08:00
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problems/0404.左叶子之和.md
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@ -651,6 +651,23 @@ impl Solution {
} }
} }
``` ```
### C#
```C#
// 递归
public int SumOfLeftLeaves(TreeNode root)
{
if (root == null) return 0;
int leftValue = SumOfLeftLeaves(root.left);
if (root.left != null && root.left.left == null && root.left.right == null)
{
leftValue += root.left.val;
}
int rightValue = SumOfLeftLeaves(root.right);
return leftValue + rightValue;
}
```
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