fix: 运算符优先级bug

azl397985856 · web-flow · commit 6e0e6ceac5f7 · 2019-10-12T11:21:12.000+08:00
diff --git a/problems/342.power-of-four.md b/problems/342.power-of-four.md
@@ -72,7 +72,7 @@ return num == 1;
 代码如下：
 
 ```js
-return num > 0 && num & (num - 1 === 0) && (num - 1) % 3 === 0;
+return num > 0 && (num & (num - 1)) === 0 && (num - 1) % 3 === 0;
 ```
 
 ## 关键点
