diff --git a/counting-bits/reeseo3o.js b/counting-bits/reeseo3o.js
new file mode 100644
index 0000000000..14006e50d2
--- /dev/null
+++ b/counting-bits/reeseo3o.js
@@ -0,0 +1,12 @@
+// Time Complexity: O(n)
+// Space Complexity: O(n)
+
+const countBits = (n) => {
+  const ans = new Array(n + 1).fill(0);
+
+  for (let i = 1; i <= n; i++) {
+    ans[i] = ans[i >> 1] + (i & 1);
+  }
+
+  return ans;
+};