剑指Offer 05. 替换空格

class Solution {
    public String replaceSpace(String s) {

        StringBuilder str = new StringBuilder();

        for (int i = 0; i < s.length(); i++) {

            if (s.charAt(i) == ' '){
                str.append("%20");
            }
            else {
                str.append(s.charAt(i));
            }
        }

        return str.toString();
    }
}

/**
 * 时间复杂度 O(n)
 * 空间复杂度 O(n)
 */

https://leetcode-cn.com/problems/ti-huan-kong-ge-lcof/