[LeetCode] Search in Rotated Sorted Array II 在旋转有序数组中搜索之二
Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand.
(i.e., [0,0,1,2,2,5,6]
might become [2,5,6,0,0,1,2]
).
You are given a target value to search. If found in the array return true
, otherwise return false
.
Example 1:
Input: nums = [2,5,6,0,0,1,2]
, target = 0
Output: true
Example 2:
Input: nums = [2,5,6,0,0,1,2]
, target = 3
Output: false
Follow up:
- This is a follow up problem to Search in Rotated Sorted Array, where
nums
may contain duplicates. - Would this affect the run-time complexity? How and why?
这道是之前那道 Search in Rotated Sorted Array 的延伸,现在数组中允许出现重复数字,这个也会影响我们选择哪半边继续搜索,由于之前那道题不存在相同值,我们在比较中间值和最右值时就完全符合之前所说的规律:如果中间的数小于最右边的数,则右半段是有序的,若中间数大于最右边数,则左半段是有序的。而如果可以有重复值,就会出现来面两种情况,[3 1 1] 和 [1 1 3 1],对于这两种情况中间值等于最右值时,目标值3既可以在左边又可以在右边,那怎么办么,对于这种情况其实处理非常简单,只要把最右值向左一位即可继续循环,如果还相同则继续移,直到移到不同值为止,然后其他部分还采用 Search in Rotated Sorted Array 中的方法,可以得到代码如下:
class Solution {
public:
bool search(vector<int>& nums, int target) {
int n = nums.size(), left = , right = n - ;
while (left <= right) {
int mid = (left + right) / ;
if (nums[mid] == target) return true;
if (nums[mid] < nums[right]) {
if (nums[mid] < target && nums[right] >= target) left = mid + ;
else right = mid - ;
} else if (nums[mid] > nums[right]){
if (nums[left] <= target && nums[mid] > target) right = mid - ;
else left = mid + ;
} else --right;
}
return false;
}
};
Github 同步地址:
https://github.com/grandyang/leetcode/issues/81
类似题目:
Search in Rotated Sorted Array
参考资料:
https://leetcode.com/problems/search-in-rotated-sorted-array-ii/
LeetCode All in One 题目讲解汇总(持续更新中...)
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