feat: add counting bits solution

Author: mangodm-web

counting-bits/mangodm-web.py

@@ -0,0 +1,11 @@
+from typing import List
+
+
+class Solution:
+    def countBits(self, n: int) -> List[int]:
+        answer = [0]
+
+        for i in range(1, n + 1):
+            answer.append(answer[i // 2] + i % 2)
+
+        return answer