diff --git a/medium/remove_sub_folders_from_the_filesystem.py b/medium/remove_sub_folders_from_the_filesystem.py
new file mode 100644
index 0000000..9f54a82
--- /dev/null
+++ b/medium/remove_sub_folders_from_the_filesystem.py
@@ -0,0 +1,30 @@
+# https://leetcode.com/problems/remove-sub-folders-from-the-filesystem
+from typing import List
+import copy
+
+class Solution:
+    def removeSubfolders(self, folder: List[str]) -> List[str]:
+        trie = {}
+        def push(trie, words, index):
+            if index >= len(words):
+                trie['end'] = True
+                return
+            if words[index] not in trie:
+                trie[words[index]] = {}
+            return push(trie[words[index]], words, index + 1)
+        def pop(trie, curr, ret):
+            if trie == None:
+                return 
+            if 'end' in trie:
+                ret.append('/' + '/'.join(curr))
+                return
+            for k, v in trie.items():
+                cur = copy.deepcopy(curr)
+                cur.append(k)
+                pop(v, cur, ret)
+        for each in folder:
+            words = each.split('/')
+            push(trie, words[1:], 0)
+        ret = []
+        pop(trie, [], ret)
+        return ret