add 122 cpp version(4ms)

Author: zouwx2cs

solution/122.Best Time to Buy and Sell Stock II/Solution.cpp

@@ -0,0 +1,15 @@
+public:
+    int maxProfit(vector<int>& prices) 
+	{
+        if (0 == prices.size())
+            return 0 ;
+        int M = 0 ;
+        for (int i = 1; i < prices.size(); ++i)
+        {
+            int d = prices[i] - prices[i-1] ;
+            if (d > 0)
+                M += d ;
+        }
+        return M ;
+    }
+};