Note: This is an extension of House Robber.
After robbing those houses on that street, the thief has found himself a new place for his thievery so that he will not get too much attention. This time, all houses at this place are arranged in a circle. That means the
first house is the neighbor of the last one. Meanwhile, the security system for these houses remain the same as for those in the previous street.
Given a list of non-negative integers representing the amount of money of each house, determine the maximum amount of money you can rob tonight without alerting the police.
Credits:
Special thanks to @Freezen for adding this problem and creating all test cases.
这条是House Robber 的变型题。
实现：
class Solution {
public:
int rob(vector<int>& nums) {
if (nums.size() == 0) return 0;
if (nums.size() == 1) return nums[0];
return max(rob(nums, 0, nums.size()-1), rob(nums, 1, nums.size()));
}
int rob(vector<int> &nums, int start, int end) {
int a = 0, b = 0;
for (int i = start; i < end; i++) {
int m = max(b, a+nums[i]);
a = b;
b = m;
}
return b;
}
};
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