122. 买卖股票的最佳时机 II

func maxProfit(prices []int) int {
    var income int
    for k := 0; (k + 1) < len(prices); k++ {
        //如果涨了，计算利润
        if prices[k+1] > prices[k] {
            income += prices[k+1] - prices[k]
        }
    }
    return income
}