剑指 Offer 05. 替换空格(java+python)

请实现一个函数，把字符串 s 中的每个空格替换成"%20"。

示例 1：

输入：s = "We are happy."
输出："We%20are%20happy."

限制：

0 <= s 的长度 <= 10000

java

StringBuilder/StringBuffer(菜鸟教程)

class Solution {
    public String replaceSpace(String s) {
        StringBuilder res = new StringBuilder();
        for(Character c:s.toCharArray()){
            if(c==' ') res.append("%20");
            else res.append(c);
        }
        return res.toString();
    }
}

python

class Solution:
    def replaceSpace(self, s: str) -> str:
        res=s.replace(' ','%20')
        return res