Update README.md

Author: hicodebear

README.md

@@ -24,7 +24,7 @@
 # ACM金牌选手讲解LeetCode算法
 
 
-<img width="376" alt="算法与数据结构知识点" src="https://user-images.githubusercontent.com/87517460/128294622-f1ef2419-094f-44ac-b668-610a0bdc798e.png">
+<img width="576" alt="算法与数据结构知识点" src="https://user-images.githubusercontent.com/87517460/128294622-f1ef2419-094f-44ac-b668-610a0bdc798e.png">
 
 
 - [ACM金牌选手讲解LeetCode算法《线性表》](https://mp.weixin.qq.com/s/qwaYOFIksFVqZtA_nisl6g)