Update 0208._implement_trie_(prefix_tree).md

docs/Leetcode_Solutions/Python/0208._implement_trie_(prefix_tree).md

-### 208. Implement Trie (Prefix Tree)
+# 208. Implement Trie (Prefix Tree)
 
-题目:
+**<font color=orange>难度: Medium</font>**
 
-<https://leetcode.com/problems/implement-trie-prefix-tree/>
+## 刷题内容
 
+> 原题连接
 
-难度:
+* https://leetcode.com/problems/implement-trie-prefix-tree/
 
-Medium
+> 内容描述
+
+```
+
+Implement a trie with insert, search, and startsWith methods.
+
+Example:
+
+Trie trie = new Trie();
+
+trie.insert("apple");
+trie.search("apple");   // returns true
+trie.search("app");     // returns false
+trie.startsWith("app"); // returns true
+trie.insert("app");   
+trie.search("app");     // returns true
+Note:
+
+You may assume that all inputs are consist of lowercase letters a-z.
+All inputs are guaranteed to be non-empty strings.
+```
+
+## 解题方案
+
+> 思路 1
+******- 时间复杂度: O(N)******- 空间复杂度: O(N)******
 
 这个Python实现也太精美了吧，谷歌复写之