add: best time to buy and sell stock

Author: freemjstudio

best-time-to-buy-and-sell-stock/freemjstudio.py

@@ -0,0 +1,21 @@
+# first attempt - time out
+
+class Solution:
+    def maxProfit(self, prices: List[int]) -> int:
+        max_profit = 0
+        for i in range(len(prices)):
+            profit = max(prices[i:]) - prices[i]
+            max_profit = max(max_profit, profit)
+        return max_profit
+
+# second attempt - greedy approach
+class Solution:
+    def maxProfit(self, prices: List[int]) -> int:
+        max_profit = 0
+        min_price = prices[0]
+
+        for i in range(len(prices)):
+            min_price = min(min_price, prices[i])
+            profit = prices[i] - min_price
+            max_profit = max(max_profit, profit)
+        return max_profit