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tarscode
LeetCode
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/
LeetCode
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HouseRobber2.java
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LeetCode
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HouseRobber2.java
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/**
* 【工程】: LeetCode 包名: PACKAGE_NAME 类名: HouseRobber2
* 【作者】: liuyang
* 【时间】: 16/12/22 下午6:44
* 【题目】: House Robber2(小偷问题2)
* 【内容】: 给定一个非负整数组,每一个数代表一个房屋的财产,限制条件是不能够连续偷两个房屋,此外,最后一个房屋和第一个房屋相连,求出能够偷得的最大财产数量是多少
* 【版本】: V1.0
* 【运行时间】:
* 【时间复杂度】:
* 【空间复杂度】:
* 【备注】:
* 【思路】:
* 跟小偷问题1的区别是第一个房屋和最后一个房屋是不能同时偷的,因此分两种情况:
* (1)偷1到n-1之间的房屋
* (2)偷2到n之间的房屋
* 求两者的最大值即可,此外需要注意的是,元素数量为1个时候需要特殊处理。
*/
public
class
HouseRobber2
{
public
int
rob
(
int
[]
nums
) {
if
(
nums
.
length
==
1
){
return
nums
[
0
];
}
return
Math
.
max
(
getMax
(
nums
,
0
,
nums
.
length
-
1
),
getMax
(
nums
,
1
,
nums
.
length
));
}
public
int
getMax
(
int
[]
nums
,
int
begin
,
int
end
){
int
pre
=
0
;
int
res
=
0
;
for
(
int
i
=
begin
;
i
<
end
;
i
++) {
if
(
nums
[
i
] +
pre
>
res
) {
int
cur
=
pre
+
nums
[
i
];
pre
=
res
;
res
=
cur
;
}
else
{
pre
=
res
;
}
}
return
res
;
}
public
static
void
main
(
String
[]
args
) {
HouseRobber2
t
=
new
HouseRobber2
();
System
.
out
.
println
();
}
}
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