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Search in Rotated Sorted Array Test | Pre-employment assessment - Testlify
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Search in Rotated Sorted Array Test

Overview of Search in Rotated Sorted Array Test

The goal of the problem is to search the target value in a rotated sorted array.

Skills measured

  • binary search
  • greedy

Available in

English

Type

Coding Test


Time

25 Mins


Level

Intermediate


Questions

1

Use of Search in Rotated Sorted Array test

The Search in Rotated Sorted Array problem involves finding a target value in a rotated sorted array. The solution approach is to start by initializing two pointers, left and right, which represent the boundaries of the search range. Initially, left = 0 and right = len(nums) - 1.
a. Calculate the mid index as mid = (left + right) // 2.
b. Check if the value at the mid index (nums[mid]) is equal to the target value. If it is, we have found the target and can return the mid index.
c. If nums[left] <= nums[mid], it means the left half of the array is sorted in ascending order.
Check if the target value lies within the sorted left half, i.e., nums[left] <= target < nums[mid]. If it does, update right = mid - 1 to search the left half.
If the target value does not lie within the sorted left half, update left = mid + 1 to search the right half.
d. If nums[mid] <= nums[right], it means the right half of the array is sorted in ascending order.
Check if the target value lies within the sorted right half, i.e., nums[mid] < target <= nums[right]. If it does, update left = mid + 1 to search the right half.
If the target value does not lie within the sorted right half, update right = mid - 1 to search the left half.
Repeat steps 2b-2d until the target value is found or the search range is exhausted (left > right).
If the target value is not found after the search range is exhausted, return -1 to indicate that the target is not present in the array.

Relevant for

  • Software Developer Engineer
  • Software Developer
  • Software Engineers

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1

binary search

Binary search is a crucial skill covered in the Search in Rotated Sorted Array problem as it allows us to efficiently search for a target element in a rotated sorted array. By repeatedly dividing the array in half and comparing the target element with the middle element, we can quickly narrow down the search space. This technique is important because it has a time complexity of O(log n), making it much faster than a linear search. Mastering binary search can greatly improve algorithm efficiency and problem-solving skills in computer science.

2

greedy

The greedy skill covered in Search in Rotated Sorted Array involves making decisions based on the current situation without considering the future consequences. In this context, it refers to the strategy of always moving towards the direction where the target element might be found, even if it means skipping some elements along the way. This skill is important in this problem because it allows us to efficiently search for the target element in a rotated sorted array by eliminating half of the elements in each step, ultimately reducing the time complexity of the search algorithm.

The Search in Rotated Sorted Array test is created by a subject-matter expert

Testlify’s skill tests are designed by experienced SMEs (subject matter experts). We evaluate these experts based on specific metrics such as expertise, capability, and their market reputation. Prior to being published, each skill test is peer-reviewed by other experts and then calibrated based on insights derived from a significant number of test-takers who are well-versed in that skill area. Our inherent feedback systems and built-in algorithms enable our SMEs to refine our tests continually.

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