diff --git a/best-time-to-buy-and-sell-stock/sol.go b/best-time-to-buy-and-sell-stock/sol.go
new file mode 100644
index 0000000..28fad5a
--- /dev/null
+++ b/best-time-to-buy-and-sell-stock/sol.go
@@ -0,0 +1,15 @@
+package main
+
+// Time: O(n)
+// Space: O(1)
+func maxProfit(prices []int) int {
+	min, max := prices[0], 0
+	for _, price := range prices {
+		if price < min {
+			min = price
+		} else if diff := price - min; diff > max {
+			max = diff
+		}
+	}
+	return max
+}