LeetCode:House Robber II

House Robber II

Total Accepted: 23515  Total Submissions: 78696  Difficulty: Medium

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.

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LeetCode:House Robber的变形

code:

class Solution {
public:
    int rob(vector<int>& nums) {
        int n = nums.size();
        if(n==0) return 0;
        if(n==1) return nums[0];
        return max(_rob(nums,0,n-2),_rob(nums,1,n-1));
    }
    
    int _rob(vector<int>& nums, int lo, int hi) {
        
        int preN = 0;
        int preY = 0;
        
        for(int i=lo;i<=hi;i++){
            int tmp = preY;
            preY = max(preN,preY);
            preN = tmp + nums[i];
        }
        return max(preN,preY);
    }
};