Update README.md

Initiativethinker · Sep 26, 2019 · 7f70ef8 · 7f70ef8
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@@ -257,6 +257,13 @@ tag: `Backtracking` `DFS`
 
 时间: 2019-08-13
 
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+### [593. 有效的正方形和](./2019-08-19.md)
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+tag: `Array` `Math`
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+时间：2019-08-19
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 ### [子数组的最大乘积](https://mp.weixin.qq.com/s/nb8zwPathjO9p4GCmmGTmQ)
 
 tag: `Array` `Math`