mv a file into correct difficulty

medium/minimum_number_of_pushes_to_type_word_ii.py

@@ -0,0 +1,19 @@
+# https://leetcode.com/problems/minimum-number-of-pushes-to-type-word-ii
+from collections import Counter
+from functools import reduce
+
+class Solution:
+    def minimumPushes(self, word: str) -> int:
+        cnt = Counter(word)
+        lst = sorted(cnt.values(), reverse=True)
+        push = 1
+        ret = 0
+        for i in range(0, len(lst), 8):
+            ret += reduce(
+                lambda x, y: x + y * push,
+                lst[i:i + 8 if i + 8 < len(lst) else len(lst)],
+                0
+            )
+            push += 1
+        return ret
+