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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 {
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```
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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!
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```java
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str.toString().replace(" ","%20");
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```
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## 3. 最长公共前缀
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> 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 ""。
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