Better variable name

Better variable name

Author: XIAOLONGLII

python/0121-best-time-to-buy-and-sell-stock.py

@@ -1,10 +1,10 @@
 class Solution:
     def maxProfit(self, prices: List[int]) -> int:
         res = 0
-
-        l = 0
-        for r in range(1, len(prices)):
-            if prices[r] < prices[l]:
-                l = r
-            res = max(res, prices[r] - prices[l])
+        
+        lowest = prices[0]
+        for price in prices:
+            if price < lowest:
+                lowest = price
+            res = max(res, price - lowest)
         return res