Can we do binary search without sorting?

The binary search algorithm may fail on unsorted arrays because the array doesn’t meet the criteria of the array being monotonically increasing or decreasing. But, sometimes the binary search algorithm may also work on unsorted arrays.

Which search is best for unsorted array?

Binary Search. Sequential search is the best that we can do when trying to find a value in an unsorted array.

How can binary search be improved?

Want to improve this question?

1. One way would be to scan the list one time to populate last index (you can use binary search for this also).
2. Instead of using only the part that starts with the same letter, maybe just search the part with the same two first letters.
3. You need to keep an extra meta index about your data.

What happens if we try to run a binary search on a list that is not sorted?

So, binary search cannot work consistently in unsorted data. Binary Search is meant to work on a Sorted Array, if its done on a Non-Sorted Array, then the result will surely be unpredictable and unreliable.

What happens if we use binary search to find an item in a list that is not sorted?

How do you search an unsorted array?

The most common algorithm to search an element in an unsorted array is using a linear search, checking element by element from the beginning to the end, this algorithm takes O(n) complexity. Using the front and back algorithm can take us a half of time.

How do you find an unsorted array?

Front and Back Search in unsorted array

1. Initialize indexes front and back pointing to first and last element respectively of the array.
2. If front is greater than rear, return false.
3. Check the element x at front and rear index.
4. If element x is found return true.
5. Else increment front and decrement rear and go to step 2.