Best Time to Buy and Sell Stock II

profit 可以累积

public class Solution {
    public int maxProfit(int[] prices) {
        // IMPORTANT: Please reset any member data you declared, as
        // the same Solution instance will be reused for each test case.
        if(prices == null)
            return 0;
        int result = 0;
        for(int i = 1; i < prices.length; i++)
        {
            if(prices[i] > prices[i-1])
                result += prices[i] - prices[i-1];
        }
        return result;
    }
}