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Count and say Test | Pre-employment assessment - Testlify
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Count and say Test

Overview of Count and say Test

The goal of the problem is to a implements a recursive function that generates the nth term of the count-and-say sequence as a string.

Skills measured

  • recursion
  • string

Available in

English

Type

Coding Test


Time

25 Mins


Level

Intermediate


Questions

1

Use of Count and say test

The solution approach to the problem is to recursively find the corresponding term of the count-and-say sequence as a string.
Base case: If n is equal to 1, we return the string "1" because the first term of the count-and-say sequence is "1".
Recursive case: For n greater than 1, we recursively call the countAndSay function with n - 1 to generate the previous term of the count-and-say sequence.
Once we have the previous term as a string, we initialize an empty string ret to store the result, an integer cnt to keep track of the count of consecutive digits, and a character cur to store the current digit.
We iterate through each character of the previous term, starting from index 1.
If the current character s[i] is equal to the current digit cur, we increment the count cnt by 1 because we have found another occurrence of the same digit.
If the current character s[i] is different from the current digit cur, it means we have encountered a new digit in the sequence. In this case, we append the count cnt followed by the current digit cur to the result string ret. Then, we update the current digit cur to be the new digit, and reset the count cnt to 1.
After the loop ends, we check if there are any remaining digits to be added to the result string. If the count cnt is greater than 0, it means we have a final sequence of the same digit. In this case, we append the count cnt to the result string ret.
Finally, we return the result string ret as the nth term of the count-and-say sequence.
The intuition behind the code is to build each term of the count-and-say sequence based on the previous term. By iterating through the previous term, we count the number of consecutive occurrences of the same digit and append the count followed by the digit to the result string. This process continues recursively until we reach the base case (the first term).

Relevant for

  • Software Developer Engineer
  • Software Developer
  • Software Engineers

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1

recursion

Recursion is a fundamental programming skill covered in Count and Say, where a function calls itself in order to solve a problem. This technique is important as it allows for the implementation of complex algorithms in a concise and elegant manner. Recursion simplifies code by breaking down a problem into smaller subproblems, making it easier to understand and debug. It also allows for the efficient solving of tasks that involve repetitive patterns or structures. Mastering recursion is essential for any programmer looking to tackle challenging problems and improve their problem-solving skills.

2

string

In the game "Count and Say," players practice their ability to count and verbally express numbers in the correct order. This skill is important as it helps reinforce number recognition and sequencing abilities. By playing this game, individuals can improve their mathematical skills and enhance their ability to communicate numbers effectively. Additionally, this game can also help develop memory and concentration skills as players must remember and accurately repeat the numbers they have heard. Overall, the string skill covered in Count and Say is essential for building a strong foundation in mathematics and communication.

The Count and say 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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