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Find Minimum In Rotated Sorted Array

Detailed guide and Python implementation for the 'Find Minimum In Rotated Sorted Array' problem.

問題提起

簡単

Suppose an array of length n sorted in ascending order is rotated between 1 and n times. For example, the array [0,1,2,4,5,6,7] might become [4,5,6,7,0,1,2] if it was rotated 4 times.

Notice that rotating an array [a[0], a[1], ..., a[n-1]] 1 time results in [a[n-1], a[0], a[1], ..., a[n-2]].

Given the sorted rotated array nums of unique elements, return the minimum element of this array.

You must write an algorithm that runs in O(log n) time.

Write a function findMin(nums: List[int]) -> int.

制約
  • n == len(nums)
  • 1 <= n <= 5000
  • -5000 <= nums[i] <= 5000
  • All integers in nums are unique
  • nums is sorted and rotated between 1 and n times

Example 1
Input
nums = [3, 4, 5, 1, 2]
Output
1
Explanation

The original array was [1,2,3,4,5] rotated 3 times. The minimum is 1.

Example 2
Input
nums = [4, 5, 6, 7, 0, 1, 2]
Output
0
Explanation

The original array was [0,1,2,4,5,6,7] rotated 4 times. The minimum is 0.

Example 3
Input
nums = [11, 13, 15, 17]
Output
11
Explanation

Array is not rotated (or rotated n times). The minimum is the first element.

Need a Hint?
Consider using Binary Search-specific data structures like sets or heaps.
Edge Cases to Watch
  • Empty input structures
  • Single element inputs
  • Large numerical bounds

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