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What is a binary search algorithm?

Binary search is an efficient algorithm to find an item in a sorted list by repeatedly dividing the search space in half. It's much faster than linear search, with a time complexity of O(log n).

Binary search is a widely used algorithm for efficiently finding an element in a sorted list. The main idea is to repeatedly divide the list in half, narrowing down the possible location of the target item. Binary search starts by comparing the target value with the middle element of the list. If the target value is smaller than the middle element, the algorithm eliminates the right half of the list and continues searching in the left half. If the target is greater than the middle element, it eliminates the left half and searches in the right half. This process continues until either the target element is found or the search space is reduced to zero, meaning the element is not in the list. The time complexity of binary search is O(log n), which makes it much more efficient than a linear search (O(n)) for large data sets. Binary search can be used in a variety of applications, such as searching through a database, finding an element in a sorted array, or even in algorithms that require optimization, like finding the square root of a number or determining the first bad version in a sequence of software releases. However, binary search has a limitation: it can only be used on sorted data. If the data is unsorted, you first need to sort it, which can take O(n log n) time. Despite this limitation, binary search is highly efficient for large data sets because it reduces the search space by half with each iteration, making it ideal for use cases where speed is critical. Additionally, binary search can be implemented both iteratively and recursively. The recursive version is more elegant but may require more memory due to the function call stack. On the other hand, the iterative version avoids this overhead. Understanding binary search is key to improving your problem-solving skills, especially when dealing with large data sets.

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