diff --git a/bangdori/338.js b/bangdori/338.js
new file mode 100644
index 0000000..b1fdb6e
--- /dev/null
+++ b/bangdori/338.js
@@ -0,0 +1,20 @@
+/**
+ * @param {number} n
+ * @return {number[]}
+ */
+var countBits = function (n) {
+  const dp = Array(10 ** 5 + 1).fill(0);
+
+  dp[1] = 1;
+
+  let exp = 1;
+  for (let i = 2; i < dp.length; i++) {
+    if (exp * 2 === i) {
+      exp *= 2;
+    }
+
+    dp[i] = dp[i - exp] + 1;
+  }
+
+  return dp.slice(0, n + 1);
+};