Dynamic Programming solution of Best Time To Buy And Sell Stock With Transaction Fee

Author: P-ppc

algorithms/BestTimeToBuyAndSellStockWithTransactionFee/README.md

@@ -1,2 +1,24 @@
 # Best Time To Buy And Sell Stock With Transaction Fee
-We can solve this problem by Greedy Algorithm
+We can solve this problem by Greedy Algorithm, or use Dynamic Programming like below:
+```python
+class Solution(object):
+    def maxProfit(self, prices, fee):
+        """
+        :type prices: List[int]
+        :type fee: int
+        :rtype: int
+        """
+        if len(prices) == 0:
+            return 0
+        # profit of not hold stock in i
+        not_holder = 0
+        # profit of hold stock in i, of course it's -prices[0] when i = 0
+        holder = -prices[0]
+        
+        for i in xrange(1, len(prices)):
+            not_holder = max(not_holder, prices[i] + holder - fee)
+            holder = max(holder, not_holder - prices[i])
+        
+        return max(holder, not_holder)
+        
+```