Update README.md

xieenqi · Jan 6, 2018 · c706d1f · c706d1f
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 **新记录，超2.3万分不倒，说明2018/01/04的优化很有效果，算法很精准。可惜这样的成绩是无法上传的。**
 
-![](img/new_record.jpeg)
+![](img/new_record.png)
 
 ## 2018/01/05优化