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public class HouseRobberII {

public int rob(int[] nums) {

int n = nums.length;

if (n == 0) {

return 0;

} else if (n == 1) {

return nums[0];

}

// 包含第一个就不能包含最后一个，包含最后一个就不能包含第一个

return Math.max(rob(nums, 0, n - 2), rob(nums, 1, n - 1));

}

private int rob(int[] nums, int start, int end) {

int prev = 0, cur = 0;

for (int i = start; i <= end; i++) {

int temp = cur;

cur = Math.max(nums[i] + prev, cur);

prev = temp;

}

return cur;

}

}