LeetCode 154: Find Minimum in Rotated Sorted Array II Solution

Master LeetCode problem 154 (Find Minimum in Rotated Sorted Array II), a hard challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

154. Find Minimum in Rotated Sorted Array II

Hard

Array Binary Search

Problem Explanation

Explanation

To find the minimum element in a rotated sorted array that may contain duplicates, we can apply a modified binary search algorithm. The idea is to compare the middle element with the rightmost element to determine which half of the array to discard. If the middle element is greater than the rightmost element, we know the minimum element must be in the right half. If they are equal, we can move the right pointer one step to the left and continue the search. By iteratively narrowing down the search range, we can find the minimum element efficiently.

The time complexity of this algorithm is O(log n) where n is the number of elements in the array. The space complexity is O(1) since we are not using any additional data structures.

Solution Code

class Solution {
    public int findMin(int[] nums) {
        int left = 0, right = nums.length - 1;

        while (left < right && nums[left] >= nums[right]) {
            int mid = left + (right - left) / 2;

            if (nums[mid] > nums[right]) {
                left = mid + 1;
            } else if (nums[mid] < nums[right]) {
                right = mid;
            } else {
                right--;
            }
        }

        return nums[left];
    }
}

Try It Yourself

Loading code editor...

Frequently Asked Questions

How to solve LeetCode 154 (Find Minimum in Rotated Sorted Array II)?

This page provides optimized solutions for LeetCode problem 154 (Find Minimum in Rotated Sorted Array II) in Java, C++, and Python, along with a detailed explanation and an interactive code editor to test your code.

What is the time complexity of LeetCode 154 (Find Minimum in Rotated Sorted Array II)?

The time complexity for LeetCode 154 (Find Minimum in Rotated Sorted Array II) varies by solution. Check the detailed explanation section for specific complexities in Java, C++, and Python implementations.

Can I run code for LeetCode 154 on DevExCode?

Yes, DevExCode provides an interactive code editor where you can write, test, and run your code for LeetCode 154 in Java, C++, or Python.

Back to LeetCode Solutions