【Leetcode】Find Minimum in Rotated Sorted Array
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题目链接:https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/
题目:
Suppose a sorted array is rotated at some pivot unknown to you beforehand.
(i.e., 0 1 2 4 5 6 7
might become 4 5 6 7 0 1 2
).
Find the minimum element.
You may assume no duplicate exists in the array.
思路:
有序数组旋转后,如果mid元素比low大,则左边有序,右边乱序,考虑最左元素是否最小元素,并继续考察右边。如果mid小于low,则左边乱序,右边有序,考虑mid是否是最小元素,并继续考察左边,调整mid。
算法:
public int findMin(int[] nums) {int min = nums[0];int l = 0, h = nums.length - 1, m = 0;while (l <= h) {m = (l + h) / 2;if (nums[m] >= nums[l]) {//右边乱序min = Math.min(nums[l], min);//左边单增,考察最左元素是否最小l = m + 1;//考虑右边} else {//左边乱序min = Math.min(nums[m], min);h = m - 1;}}return min;}
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