better solution of Best Time To Buy And Sell Stock II

Author: P-ppc

algorithms/BestTimeToBuyAndSellStockII/README.md

@@ -1,2 +1,32 @@
 # Best Time To Buy And Sell Stock
-This problem is easy to solve
+This problem is easy to solve by Greedy Algorithm, like below:
+```python
+class Solution(object):
+    def maxProfit(self, prices):
+        """
+        :type prices: List[int]
+        :rtype: int
+        """
+        if len(prices) == 0:
+            return 0
+        
+        max_profit = 0
+        holder = prices[0]
+        max_price = prices[0]
+        
+        for i in xrange(1, len(prices)):
+            price = prices[i]
+            
+            if price > max_price:
+                max_price = price
+            elif max_price > price:
+                if max_price > holder:
+                    max_profit += max_price - holder
+                holder = price
+                max_price = price
+        
+        if max_price > holder:
+            max_profit += max_price - holder
+            
+        return max_profit
+```