MCQ IN COMPUTER SCIENCE & ENGINEERING

COMPUTER SCIENCE AND ENGINEERING

ALGORITHMS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
How does binary search works?
A
we compare the key with the item in the middle position of the array. If the key is less than the item searched then it must lie in the lower half of the array, if the key is greater than the item searched than it should be in upper half of the array.
B
repeatedly breaks down a list into several sublists until each sublist consists of a single element and merging those sublists in a manner that results into a sorted list.
C
looks for binary and uses an array to easily sort them into order
D
None of the above
Explanation: 

Detailed explanation-1: -Binary search works on sorted arrays. Binary search begins by comparing an element in the middle of the array with the target value. If the target value matches the element, its position in the array is returned. If the target value is less than the element, the search continues in the lower half of the array.

Detailed explanation-2: -Binary search is an efficient algorithm for finding an item from a sorted list of items. It works by repeatedly dividing in half the portion of the list that could contain the item, until you’ve narrowed down the possible locations to just one.

Detailed explanation-3: -In a general scenario, binary search mid-value computed with, mid=(low+high)/2. However, with a vast list of elements, “high” would be a very large value.

Detailed explanation-4: -Approach for Binary Search If the target element is greater than the middle element, then the search continues in the right half. Else if the target element is less than the middle value, the search continues in the left half.

Detailed explanation-5: -Binary search is a search algorithm that finds the position of a target value within a sorted array. Binary search compares the target value to the middle element of the array. The course was developed by Harsha and Animesh from MyCodeSchool.

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