ADD : #221 by heypaprika

Author: heypaprika

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

@@ -0,0 +1,15 @@
+# Big-O 예측
+# Time : O(n)
+# Space : O(1)
+class Solution:
+    def maxProfit(self, prices: List[int]) -> int:
+        min_price = prices[0]
+        profit = 0
+
+        for price in prices[1:]:
+            if min_price > price:
+                min_price = price
+            
+            profit = max(profit, price - min_price)
+        return profit
+