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UtilitiesCore
/
leetcode
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reedfan/leetcode
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master
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leetcode
/
src
/
main
/
java
/
leetcode
/
dp
/
N213Rob.java
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52 lines (47 loc) · 1.82 KB
master
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leetcode
/
src
/
main
/
java
/
leetcode
/
dp
/
N213Rob.java
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package
leetcode
.
dp
;
/**
* 你是一个专业的小偷,计划偷窃沿街的房屋,每间房内都藏有一定的现金。这个地方所有的房屋都围成一圈,这意味着第一个房屋和最后一个房屋是紧挨着的。同时,相邻的房屋装有相互连通的防盗系统,如果两间相邻的房屋在同一晚上被小偷闯入,系统会自动报警。
*
* 给定一个代表每个房屋存放金额的非负整数数组,计算你在不触动警报装置的情况下,能够偷窃到的最高金额。
*
* 示例 1:
*
* 输入: [2,3,2]
* 输出: 3
* 解释: 你不能先偷窃 1 号房屋(金额 = 2),然后偷窃 3 号房屋(金额 = 2), 因为他们是相邻的。
*
* 示例 2:
*
* 输入: [1,2,3,1]
* 输出: 4
* 解释: 你可以先偷窃 1 号房屋(金额 = 1),然后偷窃 3 号房屋(金额 = 3)。
* 偷窃到的最高金额 = 1 + 3 = 4 。
*
* 来源:力扣(LeetCode) 213
* 链接:https://leetcode-cn.com/problems/house-robber-ii
* 著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。
*/
public
class
N213Rob
{
public
int
rob
(
int
[]
nums
) {
if
(
nums
==
null
||
nums
.
length
==
0
){
return
0
;
}
int
len
=
nums
.
length
;
if
(
len
==
1
){
return
nums
[
0
];
}
if
(
len
==
2
){
return
nums
[
0
]>
nums
[
1
]?
nums
[
0
]:
nums
[
1
];
}
return
Math
.
max
(
help
(
nums
,
0
,
len
-
2
),
help
(
nums
,
1
,
len
-
1
));
}
private
int
help
(
int
[]
nums
,
int
start
,
int
end
){
int
[]
dp
=
new
int
[
end
-
start
+
1
];
dp
[
0
] =
nums
[
start
];
dp
[
1
] =
Math
.
max
(
nums
[
start
+
1
],
nums
[
start
]);
for
(
int
i
=
start
+
2
;
i
<=
end
;
i
++ ){
dp
[
i
-
start
] =
Math
.
max
(
dp
[
i
-
start
-
1
],
dp
[
i
-
start
-
2
]+
nums
[
i
]);
}
return
dp
[
end
-
start
];
}
}
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