diff --git a/tries/map_sum.py b/tries/map_sum.py
deleted file mode 100644
index 36efcaa..0000000
--- a/tries/map_sum.py
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/usr/bin/env python3
-# -*- coding: utf-8 -*-
-# author: bt3gl
-
-'''
-Design a map that allows you to do the following:
-- Maps a string key to a given value.
-- Returns the sum of the values that have a key with a prefix equal to a given str.
-'''
-
-class Node:
-    
-    def __init__(self):
-        self.children = {}
-        self.score = 0
-
-
-class MapSum:
-
-    def __init__(self):
-        self.map = {}
-        self.root = Node()
-
-    def insert(self, key: str, val: int) -> None:
-        delta = val - self.map.get(key, 0)
-        self.map[key] = val
-        
-        node = self.root
-        node.score += delta
-        for c in key:
-            node = node.children.setdefault(c, Node())
-            node.score += delta
-
-    def sum(self, prefix: str) -> int:
-        node = self.root
-        for c in prefix:
-            if c not in node.children:
-                return 0
-            node = node.children[c]
-          
-        return node.score
-