diff --git a/算法训练/刷题笔记/迭代一.md b/算法训练/刷题笔记/迭代一.md
index 7dbf2f2..613f7b0 100644
--- a/算法训练/刷题笔记/迭代一.md
+++ b/算法训练/刷题笔记/迭代一.md
@@ -10,6 +10,7 @@
 - [ ] [239. 滑动窗口最大值 - 力扣（LeetCode）](https://leetcode.cn/problems/sliding-window-maximum/solutions/543426/hua-dong-chuang-kou-zui-da-zhi-by-leetco-ki6m/)
 	- [ ] 堆
 	- [ ] 单调队列
+- [ ] [102. 二叉树的层序遍历 - 力扣（LeetCode）](https://leetcode.cn/problems/binary-tree-level-order-traversal/) 注意是二维数组，可以延伸出很多其他题的解法必须很熟悉
  
 
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