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HouseRobber2.java
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HouseRobber2.java
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public class Solution {
public int rob(int[] nums) {
int len = nums.length;
if (len == 0) {
return 0;
}
if (len == 1) {
return nums[0];
}
if (len == 2) {
return Math.max(nums[0], nums[1]);
}
if (len == 3) {
return Math.max(Math.max(nums[0], nums[1]), nums[2]);
}
int ret = 0;
int prepre = nums[1];
int pre = Math.max(nums[1], nums[2]);
for (int i = 3; i < len; i++) {
int tmp = pre;
pre = Math.max(pre, prepre + nums[i]);
prepre = tmp;
}
if (len == 4) {
return Math.max(nums[0] + nums[2], nums[1] + nums[3]);
}
ret = pre;
prepre = nums[2];
pre = Math.max(nums[2], nums[3]);
for (int i = 4; i < len - 1; i++) {
int tmp = pre;
pre = Math.max(pre, prepre + nums[i]);
prepre = tmp;
}
return Math.max(ret, pre + nums[0]);
}
}