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Mapping of digits to letters Test | Pre-employment assessment - Testlify
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Mapping of digits to letters Test

Overview of Mapping of digits to letters Test

This problem tests the attendee's ability to generate all possible combinations of letters from a given set of digits, using a predefined mapping of digits to letters.

Skills measured

  • Programming

Available in

English

Type

Coding Test


Time

40 Mins


Level

Intermediate


Questions

1

Use of Mapping of digits to letters test

Given a string of digits, the problem requires generating all possible letter combinations that can be formed using the given digits. The input string contains only digits 2-9 inclusive. The output is a list of all possible letter combinations that the given number could represent.

To solve the problem, we can use a recursive approach. At each level of recursion, we consider the next digit in the input string and add all possible letters corresponding to that digit to each of the existing combinations. This results in the formation of new combinations. We continue this process until we have processed all the digits in the input string. Finally, we return the list of all generated combinations. Note that the base case of recursion is when we have processed all the digits in the input string.

Relevant for

  • JavaScript Developer
  • React Native Developer

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1

Programming

Mapping of digits to letters is a programming skill that involves converting numerical digits into corresponding letters, usually following a specific mapping system. This skill is important in various applications such as creating phone number pads, encoding/decoding algorithms, and data manipulation tasks. By mastering this skill, programmers can efficiently manipulate and transform numerical data into textual information, making it easier to analyze and interpret. Additionally, understanding this skill can also enhance problem-solving abilities and improve overall coding proficiency.

The Mapping of digits to letters 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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