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xmlou
leetcode
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master
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leetcode
/
src
/
findMinInRotatedSortedArrayII.java
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38 lines (38 loc) · 1.58 KB
master
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leetcode
/
src
/
findMinInRotatedSortedArrayII.java
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import
java
.
util
.
Arrays
;
// 这道题目在面试中不会让写完整的程序
// 只需要知道最坏情况下 [1,1,1....,1] 里有一个0
// 这种情况使得时间复杂度必须是 O(n)
// 因此写一个for循环就好了。
// 如果你觉得,不是每个情况都是最坏情况,你想用二分法解决不是最坏情况的情况,那你就写一个二分吧。
// 反正面试考的不是你在这个题上会不会用二分法。这个题的考点是你想不想得到最坏情况。
public
class
findMinInRotatedSortedArrayII
{
public
static
void
main
(
String
[]
args
){
findMinInRotatedSortedArrayII
obj
=
new
findMinInRotatedSortedArrayII
();
int
[]
nums
= {
2
,
2
,
2
,
2
,
2
,
2
,
2
,
2
,
3
,
4
,
0
,
1
,
2
,
2
};
System
.
out
.
println
(
obj
.
findMin
(
nums
));
}
private
int
findMin
(
int
[]
nums
){
int
left
=
0
;
int
right
=
nums
.
length
-
1
;
int
mid
;
while
(
left
+
1
<
right
){
mid
=
left
+ (
right
-
left
)/
2
;
System
.
out
.
println
(
Arrays
.
toString
(
new
int
[]{
left
,
mid
,
right
}));
//System.out.println(Arrays.toString(new int[]{nums[left],nums[mid],nums[right]}));
if
(
nums
[
mid
] >
nums
[
right
]){
left
=
mid
;
}
else
if
(
nums
[
mid
] <
nums
[
right
]){
right
=
mid
;
}
else
{
// if mid equals to end, that means it's fine to remove end
// the smallest element won't be removed
right
--;
}
}
if
(
nums
[
left
] <
nums
[
right
]){
return
nums
[
left
];
}
else
{
return
nums
[
right
];
}
}
}
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