Best Time to Buy and Sell Stock II

 1 int maxProfit(int* prices, int pricesSize) {
 2     int sum=0,i;
 3     if(prices==NULL||pricesSize==1)
 4         return 0;
 5     for(i=1;i<pricesSize;i++)
 6     {
 7         if(prices[i]>prices[i-1])
 8             sum=prices[i]-prices[0];
 9         else
10         {
11             return sum+maxProfit(prices+i,pricesSize-i);
12         }
13     }
14     return prices[i-1]-prices[0];
15 }