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Update 几道常见的字符串算法题.md

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@ -68,6 +68,12 @@ public class Solution {
``` ```
对于替换固定字符（比如空格）的情况，第二种方法其实可以使用 `replace` 方法替换，性能更好!
```java
str.toString().replace(" ","%20");
```
## 3. 最长公共前缀 ## 3. 最长公共前缀
> Leetcode: 编写一个函数来查找字符串数组中的最长公共前缀。如果不存在公共前缀，返回空字符串 ""。 > Leetcode: 编写一个函数来查找字符串数组中的最长公共前缀。如果不存在公共前缀，返回空字符串 ""。