题目：

题解：

func _rob(nums []int) int {
    first, second := nums[0], max(nums[0], nums[1])
    for _, v := range nums[2:] {
        first, second = second, max(first+v, second)
    }
    return second
}

func rob(nums []int) int {
    n := len(nums)
    if n == 1 {
        return nums[0]
    }
    if n == 2 {
        return max(nums[0], nums[1])
    }
    return max(_rob(nums[:n-1]), _rob(nums[1:]))
}

func max(a, b int) int {
    if a > b {
        return a
    }
    return b
}