DaleStudy · dolphinflow86 · Jul 20, 2026 · Jul 22, 2026 · Jul 24, 2026 · Jul 25, 2026
diff --git a/best-time-to-buy-and-sell-stock/dolphinflow86.py b/best-time-to-buy-and-sell-stock/dolphinflow86.py
@@ -0,0 +1,13 @@
+# 1) Keep track of local minimum and use local minimum to update max profile while interating prices.
+# TC: O(N) where N is the length of prices
+# SC: O(1)
+class Solution:
+    def maxProfit(self, prices: List[int]) -> int:
+        min_price = prices[0]
+        max_profit = 0
+
+        for price in prices:
+            max_profit = max(max_profit, price - min_price)
+            min_price = min(min_price, price)
+
+        return max_profit