diff --git a/CodingInterview.md b/CodingInterview.md
index aa4613d..e8bcffc 100644
--- a/CodingInterview.md
+++ b/CodingInterview.md
@@ -29,6 +29,7 @@
 | 26 | [树的子结构](https://www.nowcoder.com/practice/6e196c44c7004d15b1610b9afca8bd88?tpId=13&tqId=11170&tPage=1&rp=1&ru=%2Fta%2Fcoding-interviews&qru=%2Fta%2Fcoding-interviews%2Fquestion-ranking) | [572. Subtree of Another Tree](solutions/572.%20Subtree%20of%20Another%20Tree.md)| 略有不同 |
 | 27 | [二叉树的镜像](https://www.nowcoder.com/practice/564f4c26aa584921bc75623e48ca3011?tpId=13&tqId=11171&tPage=1&rp=1&ru=%2Fta%2Fcoding-interviews&qru=%2Fta%2Fcoding-interviews%2Fquestion-ranking) | [226. Invert Binary Tree](solutions/226.%20Invert%20Binary%20Tree.md)|
 | 28 | [对称的二叉树](https://www.nowcoder.com/practice/ff05d44dfdb04e1d83bdbdab320efbcb?tpId=13&tqId=11211&tPage=1&rp=1&ru=/ta/coding-interviews&qru=/ta/coding-interviews/question-ranking) | [101. Symmetric Tree](solutions/101.%20Symmetric%20Tree.md)|
+| 29 | [顺时针打印矩阵](https://www.nowcoder.com/practice/9b4c81a02cd34f76be2659fa0d54342a?tpId=13&tqId=11172&tPage=1&rp=1&ru=%2Fta%2Fcoding-interviews&qru=%2Fta%2Fcoding-interviews%2Fquestion-ranking) | [54. Spiral Matrix](solutions/54.%20Spiral%20Matrix.md)|