adding implement trie prefix tree

Author: daiyongg-kim

implement-trie-prefix-tree/daiyongg-kim.py

@@ -0,0 +1,42 @@
+class Trie:
+
+    def __init__(self):
+        self.children = {}
+        self.is_end = False
+
+    def insert(self, word: str) -> None:
+        node = self
+
+        for c in word:
+            if c not in node.children:
+                node.children[c] = Trie()
+            node = node.children[c]
+        
+        node.is_end = True
+
+
+    def search(self, word: str) -> bool:
+        node = self
+
+        for c in word:
+            if c not in node.children:
+                return False
+            node = node.children[c]
+        
+        return node.is_end
+
+    def startsWith(self, prefix: str) -> bool:
+        node = self
+        for c in prefix:
+            if c not in node.children:
+                return False
+            node = node.children[c]
+        return True
+        
+
+
+# Your Trie object will be instantiated and called as such:
+# obj = Trie()
+# obj.insert(word)
+# param_2 = obj.search(word)
+# param_3 = obj.startsWith(prefix)