Binary search or half-interval search is an algorithm that’s applied in computer science to find a key value within an array. And the array must be sorted either in ascending or descending order for the half-interval search to work. Otherwise, it’s not working. In today’s post, AlgoMonster provides answers to some of the most commonly asked questions about this method.

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**Is it necessary to sort the array in binary search?**

Binary Search is a search algorithm used in computer science to locate a specific element within an array. Also, it only works with Sorted Arrays.

So, yes, it is necessary to sort the array to perform half-interval search. The desired operation cannot be completed in a long time complexity if the data is unsorted.

**Is it possible to perform half-interval search in an unsorted array?**

Binary search can only be used on one type of “unsorted” array, the rotated array. This can be done in O(log N) time, just like any other half-interval search. However, it uses an adjusted divide-and-conquer approach.

**What type of search does it require that a list be sorted? **

It is worth using a sorted list to sort new entries into the list if you are searching frequently and have changed data. Binary search works better if you can search the same list repeatedly without resorting. Thus, there is no advantage to searching if you have to sort each time.

**Why does binary only work for sorted arrays?**

Binary search assumes that the middle of an array contains the median value. And that is the only way this method can work. Half-interval search doesn’t do the sort by itself because it doesn’t need to sort the array.

**How does this method work?**

Binary search starts by comparing the element in the middle of the target value. If the target value matches an element, the position is returned. Then, if the target value matches the element, the search will continue in the lower half.

In other words, half-interval search searches for a specific item by comparing the middlemost item in the collection. The index of the item will be returned if a match is found. If the item’s middle item is larger than the item, the item will be searched in the sub-array left of the middle one.

**What is the time complexity of half-interval search?**

Binary search runs at the worst logarithmic speed, making O(log n) comparisons. n is the number of elements in the array. The O is Big O notation. Log is the logarithm. Half-interval search uses constant (O(1) space), meaning that it takes the same space for all elements of the array.

**What happens if the array cannot be sorted in binary search?**

As we’ve mentioned, binary search will not work in unsorted data. If it is done on an unsorted array, the result will likely be unpredictable and unreliable. So, the result you get is most likely to be false.

**Why do people call it binary?**

Wikipedia states that binary search is the ability to search for a range of sorted values. Dichotomic search, which is a more general term for dividing and conquering a search by repeatedly splitting the search space, is also known. Literally, binary means “that cuts in two”.

**Which search method is the better?**

Linear search is the best option when data is small and unsorted. Because it goes through every value of the data linearly, it will take a long time to search for large amounts of data.

On the other hand, logarithmic search is an efficient search algorithm that relies on the order of the elements in the list. So when it comes to large data, binary works much better.

**What’s the time complexity of binary search?**

This is the power and potential of half-interval search. Binary search algorithms are O(log n). This class is responsible for the time complexity. Half-interval search is O(log N) because it reduces the input set by half each iteration. It is easier to see it in reverse.

**What are the uses of binary search?**

Half-interval search is useful in finding specific values within certain continuous functions. You can use repeated square powers of 2 to find a value that is at least equal to 67. This means that and is between 8 to 9. This is guaranteed in logarithmic times.

**Why is binary search so popular?**

It is popular because half-interval search has an O(log(n),) time complexity for every search on a list containing n items, provided that the items are sorted in order. This problem can be solved using binary search in log(n), which is much better than linear search.

**In what situations would you prefer to use the binary search method instead of the sequential?**

Sorting data that isn’t sorted will take time of O(n log n). In this case, using sequential Search is more efficient than a Binary Search because it takes O(n log n) time to sort the data. Half-interval search requires that the data be sorted in O (n log n), and then searched within the time of O (log n).

**Is it always more efficient than linear search?**

Depends. As we all know, normally, half-interval search with time complexity of O(log n) is faster than linear search. Binary search involves finding the middle element in a sorted array and then comparing it with your target element.

**What’s the difference between binary and linear search?**

Linear searches scan one item at a given time and skip to other items. Binary search, on the other hand, reduces your search time to half when you find the middle of a sorted listing. Linear search has O(n) complexity, while half-interval search makes O(log n), comparisons. Linear search employs a sequential approach.

**Where can you use binary search in real life?**

Actually, many people do half-interval searches even though they aren’t aware. You don’t have to review every word in a dictionary when searching for a specific word. Instead, you start from the middle part to look at one word and narrow down the list of words you want to search.