Day 78/90 | 🔥 Search & Minimum in Rotated Array II | LeetCode 81 + 154 🚀#9

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Master two important rotated sorted array problems with duplicates using binary search.

In this video, we solve:

81. Search in Rotated Sorted Array II
154. Find Minimum in Rotated Sorted Array II

Both problems are slightly trickier than their original versions because the array can contain duplicate values. Duplicates create confusion in binary search because sometimes we cannot clearly decide which half is sorted.

For example:

[1, 0, 1, 1, 1]

Here, nums[low], nums[mid], and nums[high] can all be equal, making it difficult to know whether the left half or right half is sorted.

In this video, we cover:

What changes when duplicates are allowed
Why normal rotated binary search is not always enough
How duplicate values create ambiguity
The role of low, mid, and high
How to safely shrink the search space
Detailed dry run for Search in Rotated Sorted Array II
Detailed dry run for Find Minimum in Rotated Sorted Array II
Java code explanation
Time and space complexity
Why the worst-case time complexity can become O(n)

For Search in Rotated Sorted Array II, we learn how to handle the confusing case:

if (nums[low] == nums[mid] && nums[mid] == nums[high]) {
low++;
high--;
}

For Find Minimum in Rotated Sorted Array II, we learn why this condition is useful:

if (nums[mid] greater than nums[high]) {
low = mid + 1;
} else if (nums[mid] less than nums[high]) {
high = mid;
} else {
high--;
}

These two problems are perfect for understanding how binary search changes when duplicate values are present.

This video is useful for anyone preparing for coding interviews, LeetCode practice, DSA patterns, and mastering modified binary search problems.

Hashtags:
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Your Queries:
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CHAPTERS
00:00 - Introduction
03:09 - LeetCode 81 - Approach 1 - Theory
47:12 - LeetCode 81 - Approach 1 - Code
51:43 - LeetCode 154 - Approach 1 - Theory
01:19:24 - LeetCode 154 - Approach 1 - Code
01:22:30 - Conclusion

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Видео Day 78/90 | 🔥 Search & Minimum in Rotated Array II | LeetCode 81 + 154 🚀#9 канала CTO Bhaiya