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Spiral Matrix Test | Pre-employment assessment - Testlify
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Spiral Matrix Test

Overview of Spiral Matrix Test

The problem involves iterating through a 2d matrix in a spiral order. this problem is relevant in various domains, including computer graphics and simulations. the solution typically manages boundaries traversing the while traversing the matrix.

Skills measured

  • matrix
  • greedy

Available in

English

Type

Coding Test


Time

15 Mins


Level

Intermediate


Questions

1

Use of Spiral Matrix test

The problem involves iterating through a 2D matrix in a spiral order. This problem is relevant in various domains, including computer graphics and simulations. The solution typically manages boundaries traversing the while traversing the matrix.
The solution to the problem is to traverse a 2D matrix in a spiral order and returning the elements in that order.
Initialize a 2D vector dirs to represent the four possible directions of movement: right, down, left, and up.

Create an empty vector res to store the elements in spiral order.

Determine the number of rows (nr) and columns (nc) in the input matrix. If either is zero, return the empty result vector.

Create a vector nSteps to keep track of the number of steps in each direction. It initially contains the number of columns (nc) and one less than the number of rows (nr - 1).

Initialize variables iDir, ir, and ic. iDir keeps track of the current direction index, while ir and ic represent the initial position as row and column indices, respectively.

Enter a while loop that continues until both nSteps[0] and nSteps[1] become zero. This loop handles the traversal of the matrix in a spiral manner.

Within the loop, iterate through the elements in the current direction by updating ir and ic based on the direction specified by iDir and appending the element at the current position to the result vector res.

Decrease the number of steps in the current direction by one (nSteps[iDir%2]--) and update the direction index (iDir) by incrementing it modulo 4 to cycle through the four possible directions.

Once both nSteps[0] and nSteps[1] become zero, the while loop terminates, and the function returns the result vector res containing the matrix elements in spiral order.

Relevant for

  • Software Developer Engineer
  • Software Developer
  • Software Engineers

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1

matrix

In Spiral Matrix, one of the key skills covered is the ability to manipulate and traverse through a matrix in a spiral order. This skill is important as it helps in efficiently accessing and processing data stored in a matrix. By following a spiral path, one can ensure that each element in the matrix is visited exactly once, without missing any. This skill is especially useful in tasks such as image processing, pattern recognition, and matrix operations, where accessing elements in a specific order is crucial for accurate results. Mastering the skill of navigating a matrix in a spiral order can greatly enhance one's ability to work with complex data structures effectively.

2

greedy

In the context of the Spiral Matrix problem, the greedy skill involves continuously moving in a clockwise direction while traversing the matrix to ensure efficient and optimal path traversal. This skill is important as it helps in ensuring that each element in the matrix is visited exactly once in a spiral order, without revisiting any element. By following a greedy approach and always taking the next available step that leads to the next element in the spiral path, this skill helps in efficiently solving the problem and achieving the desired output.

The Spiral Matrix 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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