Hackerrank problem solving

Hackerrank problem solving DEFAULT

Problem Solving

Solving problems is the core of computer science. Programmers must first understand how a human solves a problem, then understand how to translate this "algorithm" into something a computer can do, and finally how to write the specific code to implement the solution. At its core, problem-solving focuses on the study, understanding, and usage of data structures and algorithms. 

This competency area includes working with Data Structures such as Trees, Graph Traversal, using Dynamic Programming and Specialized Algorithms, among others. 

Key Competencies:

  1. Advanced Data Structures - Work with Data Structures such as Trees, Graph Traversal. Find the shortest paths, diameter, etc. Use trees such as binary search effectively.
  2. Advanced Algorithms - Use Dynamic Programming and Specialized Algorithms. Knowledge of efficient string search algorithms such as Rabin-Karp and Knuth-Morris-Pratt. Efficient graph search algorithms such as Dijkstra’s algorithm. Create complex or multi-dimensional dynamic programming models.
Sours: https://www.hackerrank.com/skills-directory/problem_solving_advanced

There are N problems numbered 1..N which you need to complete. You've arranged the problems in increasing difficulty order, and the ith problem has estimated difficulty level i. You have also assigned a rating vi to each problem. Problems with similar vi values are similar in nature. On each day, you will choose a subset of the problems and solve them. You've decided that each subsequent problem solved on the day should be tougher than the previous problem you solved on that day. Also, to make it less boring, consecutive problems you solve should differ in their vi rating by at least K. What is the least number of days in which you can solve all problems?

Input Format

The first line contains the number of test cases T. T test cases follow. Each case contains an integer N and K on the first line, followed by integers v1,...,vn on the second line.

Constraints

1 <= T <= 100
1 <= N <= 300
1 <= vi <= 1000
1 <= K <= 1000

Output Format

Output T lines, one for each test case, containing the minimum number of days in which all problems can be solved.

Sample Input

Explanation

For the first example, you can solve the problems with rating 5 and 7 on the first day and the problem with rating 4 on the next day. Note that the problems with rating 5 and 4 cannot be completed consecutively because the ratings should differ by at least K (which is 2). Also, the problems cannot be completed in order 5,7,4 in one day because the problems solved on a day should be in increasing difficulty level.

For the second example, all problems can be solved on the same day.

Sours: https://www.hackerrank.com/challenges/problem-solving/problem
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Problem Solving (Basic) Skills Certification Test

Skill over pedigree

  • Prove your Skills

    The HackerRank Skills Certification Test is a standardized assessment to help developers prove their coding skills.

  • Get noticed by companies

    Candidates who successfully clear the test will be specially highlighted to companies when they apply to relevant roles.

How does it work?

  1. Update Profile
  2. Take the Test
  3. Apply to Jobs
  4. Get highlighted to companies
Proceed to take the HackerRank Skills Test

No Worries. Zero risk.

If you fail to clear the test, no harm done. Your scores will remain private and will not be shared with any company.
You will be allowed to retake the test (if available) after a stipulated number of days.

What can I expect during the test?

  • 1 hr 30 mins Timed Test

    The test will be for a duration of 1 hr 30 mins.

  • Problem Solving Concepts

    It covers basic topics of Data Structures (such as Arrays, Strings) and Algorithms (such as Sorting and Searching).

Do you have more questions? Check out our FAQ.

Sours: https://www.hackerrank.com/skills-verification/problem_solving_basic
5 Problem Solving Tips for Cracking Coding Interview Questions

Basics of Problem Solving

Learn the basics of problem solving.

Speed . Accuracy . Efficiency

This practice contest contains 5 tutorial problems. It is intended to teach the anatomy of a programming contest.


You are registered for the contest.

Sweet, we've sent you an email confirming your registration!

You can tell your friends about Basics of Problem Solving
Practice

You might like to solve practice problems on HackerRank.

Rules

  • All the challenges will have a predetermined score. Score of a game is calculated using Bayesian Approximation
  • This contest will appeal to programmers who're interested in interesting algorithmic challenges, AI challenges and of course general programming
  • HackerRank admins decision will be final
  • Please refrain from discussing strategy during the contest.
  • Any case of code plagiarism will result in disqualification of both the users from the contest. We've a fairly good plagiarism detector that works at the opcode level.
  • You can code directly on our interface. We support 20 major languages. You can have a look at the environment in which we run your code


Sours: https://www.hackerrank.com/basics-of-problem-solving/

Solving hackerrank problem

Problem Solving

Solving problems is the core of computer science. Programmers must first understand how a human solves a problem, then understand how to translate this "algorithm" into something a computer can do, and finally how to write the specific code to implement the solution. At its core, problem-solving focuses on the study, understanding, and usage of data structures and algorithms. 

This competency area includes basic Data Structures and Algorithms.

Key Competencies:

  1. Basic Data Structures - Use Data Structures such as Arrays and Strings. Traverse through arrays, strings, and linked lists. Access and update individual elements in arrays, and characters in strings.
  2. Basic Algorithms (such as Sorting and Searching) - Create simple sorting algorithms such as bubble sort, merge sort, counting sort. Create simple brute force and sub-optimal solutions. 
Sours: https://www.hackerrank.com/skills-directory/problem_solving_basic
Solving HackerRank Python 3 Tutorial #1 - Hello World

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