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T117.java
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30 lines (26 loc) · 757 Bytes
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/**
* @Author:Aliyang
* @Data: Created in 上午11:35 18-6-16
* search-in-rotated-sorted-array：我的解法
* 思路：二分
**/
public class T117 {
public int search(int[] A, int target) {
int start=0,end=A.length-1;
while (start<=end){
int mid=(start+end)/2;
if (A[mid]==target)
return mid;
if (A[start]<=A[mid]){//mid在左边旋转部分
if (target>=A[start]&&target<A[mid])
end=mid-1;
else start=mid+1;
}else {//mid在右边旋转部分
if (A[mid]<target&&target<=A[end])
start=mid+1;
else end=mid-1;
}
}
return -1;
}
}