Merge pull request vprusso#6 from mmohamedali/fix-buy-sell-stock-code

Fixed Runtime Error that was causing the code to not run.

data_structures/arrays/buy_and_sell_stock_once.py

@@ -16,16 +16,18 @@ def buy_and_sell_once(A):
 # Time Complexity: O(n)
 # Space Complexity: O(1)
 def buy_and_sell_stock_once(prices):
-    max_profit = 0.0
-    min_price = float('inf')
-
-    for price in prices:
-        min_price = min(min_price, price)
-
+    # Check if the prices array is less than 2
+    if len(prices) < 2:
+        return 0
+
+    min_price = prices[0]
+    max_profit = 0
+
+    for price in prices: 
+       	min_price = min(min_price, price)
         compare_profit = price - min_price
-
         max_profit = max(max_profit, compare_profit)
-        
+
     return max_profit