Medium Understand Sorting & Searching open_ended

What is Timsort (used in Python and modern JS) and what makes it adaptive?

Understand — Tests comprehension and ability to explain concepts.

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This question is from the Sorting & Searching topic (Algorithms).

What is the time complexity of binary search on a sorted array of n elements?

Which sorting algorithm is stable and guarantees O(n log n) worst case?

What is the space complexity of mergesort?

Why does quicksort degrade to O(n²) on already-sorted input with last-element pivot?

Implement binary search to find the leftmost occurrence of a target.