diff --git a/best-time-to-buy-and-sell-stock/anniemon.js b/best-time-to-buy-and-sell-stock/anniemon.js
new file mode 100644
index 000000000..4247a6e1f
--- /dev/null
+++ b/best-time-to-buy-and-sell-stock/anniemon.js
@@ -0,0 +1,18 @@
+/**
+ * 시간 복잡도: prices.length만큼 순회하므로 O(n)
+ * 공간 복잡도: 상수 크기의 변수만 사용하므로 O(1)
+ */
+/**
+ * @param {number[]} prices
+ * @return {number}
+ */
+var maxProfit = function (prices) {
+  let maxProfit = 0;
+  let min = prices[0];
+
+  for (let i = 0; i < prices.length; i++) {
+      maxProfit = Math.max(maxProfit, prices[i] - min);
+      min = Math.min(min, prices[i]);
+  }
+  return maxProfit;
+};