If a participant submits more than one solution per challenge, then the participant’s score will reflect the highest score. Learn how to solve the HackerRank Recursion: Fibonacci Numbers problem in Python, JavaScript and Java programming languages. For each query, you have to find the value of:{"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Dynamic Programming/Modified Fibonacci":{"items":[{"name":"Solution. Compute the nth term of a Fibonacci sequence. Compute the nth term of a Fibonacci sequence. Very dumb by the way, but fast enough to find the 24 modified Fibonacci number in a half of second (0 1 24). md","contentType":"file"},{"name":"absolute-permutation. In this HackerEarth Fibonacci with GCD problem solution, You are given N integers, A1, A2,. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms - Dynamic Programming/Modified Fibonacci":{"items":[{"name":"Readme. A series is defined in the following manner: Given the nth and (n+1)th terms, the (n+2)th can be computed by the following relation T(n+2) = (Tn+1)^2 + T(n) So, if the first two terms of the series are 0 and 1: the third term = 1^2 + 0 = 1 fourth term = 1^2 + 1 = 2 fifth term = 2^2 + 1 = 5. Code your solution in our custom editor or code in your own environment and upload your solution as a file. HackerRank Knapsack problem solution. Iterate from 1 to n-1 and print f2 then store f2 in temp variable and update f2 with f2 + f1 and f1 as f2. Why is that? An algorithm in our iterative solution takes linear time to complete the task. LinksApproach. ; Now if is divisible by either or , then we call the date a lucky date. 4 years ago + 1 comment. Array consisting of consecutive integers [ 1, then it should return 1 Among three numbers, the!{"payload":{"allShortcutsEnabled":false,"fileTree":{"solution/practice/algorithms/dynamic-programming/fibonacci-modified":{"items":[{"name":"solution. {"payload":{"allShortcutsEnabled":false,"fileTree":{"HackerRankDashboard/Tutorials/CrackingTheCodingInterview/src/main/java/com/javaaid/hackerrank/solutions/tutorials. In each query, you are given two integers L and R (1 <= L <= R <= N). 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. HackerRank. Compute the nth term of a Fibonacci sequence. In this post, we will solve HackerRank Modified Kaprekar Numbers Problem Solution. bvs. Discussions. Compute the nth term of a Fibonacci sequence. Missing Numbers [Easy] Solution. Leaderboard. In mathematical terms, the sequence Fn of Fibonacci numbers is defined by the recurrence relation: with seed values and and . 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. Some other problems on Fibonacci Numbers. Submissions. Problem. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. Compute the nth term of a Fibonacci sequence. By starting with 1 and 2, the first 10 terms will be: 1, 2, 3, 5, 8, 13, 21, 34, 55, 89,. Output Format. algorithm c++ dynamic-programming. AN and Q queries. com practice problems using Python 3, С++ and Oracle SQL - GitHub - marinskiy/HackerrankPractice: 170+ solutions to Hackerrank. 00 kevmo314 01 45. Algorithms. All credits to Rodney Shaghoulian for this simple solution for the HackerRank challenge – Recursion – Fibonacci Numbers. Code your solution in our custom editor or code in your own environment and upload your solution as a file. Show More Archived Contests. Discussions. 5 of 6; Submit to see results When you're ready, submit your solution! Remember, you can go back and refine your code anytime. In this HackerRank Kingdom Division problem solution we have given a map of the kingdom's n cities, find and print the number of ways King Arthur can divide it between his two children such that they will not invade each other. What about some more complex series and not just a list of consecutive numbers or letters? The first two numbers of the Fibonacci series are 0 and 1. py","path. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. Use the dynamic programming to calculate all numbers from the third number to the Nth number. Problem solution in Python. Leaderboard. . br. 5 of 6; Submit to see results When you're ready, submit your solution! Remember, you can go back and refine your code anytime. Well you could do that, but you don't need to. . Is there any solution of extending the range of primary data types so as to accomodate integers with values greater than 64 bit???. ⭐️ Content Description ⭐️ In this video, I have explained on how to solve fibonacci modified using simple logic in python. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"README. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Dynamic Programming/Fibonacci Modified":{"items":[{"name":"Solution. py","path. Connected Cells In A Grid [Medium] Solution. MenuYASH PAL July 23, 2021. 6 of 6Hackerrank describes this problem as easy. As a rule thumb: brute-force is rarely an option. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Dynamic Programming/Modified Fibonacci":{"items":[{"name":"Solution. saude. Largest subset whose all elements are Fibonacci numbers; Count Fibonacci numbers in given range in O(Log n) time and O(1) space; Number of ways to represent a number as sum of k fibonacci numbers; Pair of fibonacci numbers with a given sum and minimum absolute difference;. {"payload":{"allShortcutsEnabled":false,"fileTree":{"hackerrank":{"items":[{"name":"lay-contest","path":"hackerrank/lay-contest","contentType":"directory"},{"name. java","path":"twins/Solution. You can take the test as many times as needed. 00 lewin 01 45. If a participant submits more than one solution per challenge, then the participant’s score will reflect the highest score achieved. sbatten1969 October 27, 2018, 11:11pm 2. Editorial. {"payload":{"allShortcutsEnabled":false,"fileTree":{"solution/practice/algorithms/dynamic-programming/fibonacci-modified":{"items":[{"name":"solution. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Dynamic Programming/Fibonacci Modified":{"items":[{"name":"Solution. Fibonacci Modified . Problem solution in Python. Hackerrank - Fibonacci Modified Solution-20 | Parent Permalink. // HackerRank problem in dynamic programming . If you square it, then split the. Marc's Cakewalk [Easy] Solution. The idea is to store all fibonacci numbers upto 50th fibonacci number in a map. I made it through 2D array. lines follow. HackerRank: Fibonacci Modified (in Algorithm) Problem Statement. py","path. Fibonacci Modified. 00 danielfleischman 01 45. HackerRank içerisinde bulunan "Fibonacci Modified" sorusunun açıklaması ve çözümü. Fibonacci Modified Hackerrank. 5 of 6; Submit to see results When you're ready, submit your solution! Remember, you can go back and refine your code anytime. View Challenges. Hi, guys in this video share with you the HackerRank Recursion: Fibonacci Numbers problem solution in Python programming | Interview Preparation Kit. Code your solution in our custom editor or code in your own environment and upload your solution as a file. cpp","contentType":"file"},{"name":"Divisor. java","path":"Algorithms/Dynamic. {"payload":{"allShortcutsEnabled":false,"fileTree":{"solution/practice/algorithms/dynamic-programming/fibonacci-modified":{"items":[{"name":"solution. 2 years ago + 0 comments. So, if the first two terms of the series are 0 and 1: the third term = 1 2 + 0 = 1. By starting with and , the first terms will be: By considering the terms in the Fibonacci sequence whose values do not exceed , find the sum of the even-valued terms. This solution is written in Java. {"payload":{"allShortcutsEnabled":false,"fileTree":{"solution/practice/algorithms/dynamic-programming/fibonacci-modified":{"items":[{"name":"solution. The cut command performs operations on each line it reads. Skills: Problem Solving (Basic) Take this mock test to evaluate how much you've learned till now. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":". md","path":"Algorithms - Dynamic. It's challenging, admirable, and beneficial either way. 6 of 6Note: the Quickest Way up solution fibonacci series hackerrank solution in c compute and print Fibonacci. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Dynamic Programming/Stock Maximize":{"items":[{"name":"Solution. My solution is psuedo-mathematical and not rigorous but hey, it works! Each new term in the Fibonacci sequence is generated by adding the previous two terms. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"AVeryBigSum. Compute the nth term of a Fibonacci sequence. Compute the nth term of a Fibonacci sequence. The thing to note is that the order of selection of elements doesn’t have a effect on the final outcome of the problem. java Go to file Go to file T; Go to line L; Copy path Copy. Linear Algebra – Hacker Rank Solution. if you. c at master · svshyam91/hacker_rank_solutionsMock Test. If two or more participants achieve the same score, then the tie is broken by the total time. Code your solution in our custom editor or code in your own environment and upload your solution as a file. HackerRank / Algorithms / Dynamic Programming / Fibonacci Modified / Solution. Compute the nth term of a Fibonacci sequence. Table of Contents. Problem. Fibonacci Modified. HackerRank Recursion: Fibonacci Numbers interview preparation kit solution in java python c++ c and javascript programming with practical program code Fibonacci Modified | HackerRank. Minimum Absolute Difference in an Array [Easy] Solution. S. {"payload":{"allShortcutsEnabled":false,"fileTree":{"solution/practice/algorithms/dynamic-programming/fibonacci-modified":{"items":[{"name":"solution. Problem. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Dynamic Programming/Modified Fibonacci":{"items":[{"name":"Solution. Medium Problem Solving (Basic) Max Score: 45 Success Rate: 80. cpp","contentType":"file"},{"name":"A_Small_Step_Toward. I first declared an empty array. Contribute to alexprut/HackerRank development by creating an account on GitHub. Code your solution in our custom editor or code in your own environment and upload your solution as a file. Goal is to maximise the amount of money the mechanic can earn. This problem is a programming version of Problem 2 from projecteuler. You use it in the class like this. Given three integers, , , and , compute and print the term of a modified Fibonacci sequence. Here's my Python3 solution, using matrix exponentiation by repeated squaring:{"payload":{"allShortcutsEnabled":false,"fileTree":{"solution/practice/algorithms/dynamic-programming/fibonacci-modified":{"items":[{"name":"solution. java","path":"Algorithms/Dynamic. Leaderboard. Fibonacci Modified | HackerRank Compute the nth term of a Fibonacci sequence. 2K views 2 years ago How’d You Code That? Fibonacci Modified on HackerRank: Show. {"payload":{"allShortcutsEnabled":false,"fileTree":{"DynamicProgramming":{"items":[{"name":"Candies. The method returns an int but it is expected that I will be obtaining huge values. Function Description. @sumesh – The basics of the solution is a simple loop. Ended. It's easier without it: Don't have three variables ( first , second and third ). My solution is psuedo-mathematical and not rigorous but hey, it works! Each new term in the Fibonacci sequence is generated by adding the previous two terms. {"payload":{"allShortcutsEnabled":false,"fileTree":{"solution/practice/algorithms/dynamic-programming/fibonacci-modified":{"items":[{"name":"solution. gitignore","path":". This is a collection of my HackerRank solutions written in Python3. c","path":"a. 1812629 Data Structure & Algorithms IIFinal Assessment 2 - Video PresentationProject Euler #2 “Each new term in the Fibonacci sequence is generated by adding the previous two terms. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"2D Array - DS. Given the starter code, complete the Fibonacci function to return the Nth term. md","path":"README. Discussions. 6 months ago + 0 comments. I submitted a solution using dynamic programming, and one using just regular recursion. . Compute the nth term of a Fibonacci sequence. Hiring developers? Log In; Sign Up; Prepare. Contribute to BlakeBrown/HackerRank-Solutions development by creating an account on GitHub. Submissions. Discussions. 6 of 6 Solution Key Point 1: Memoization. {"payload":{"allShortcutsEnabled":false,"fileTree":{"twins":{"items":[{"name":"Solution. and we need to find the smallest and next to smallest element in the bitwise operation of both elements are maximum. I used BigInteger instead of int. Here is my solution in java, javascript, python, C, C++, Csharp HackerRank Fair Cut Problem Solution-1 | Permalink. And the 4th element is 8. Blog; Scoring; Environment; FAQ; About Us;Code your solution in our custom editor or code in your own environment and upload your solution as a file. I then define a method that takes in a parameter and turns it into a list that stores two initial values, 0 and 1. PROBLEM STATMENT - Implement a modified Fibonacci sequence using the following definition: t i+2 = t i + (t i +1)^ 2. {"payload":{"allShortcutsEnabled":false,"fileTree":{"solution/practice/algorithms/dynamic-programming/fibonacci-modified":{"items":[{"name":"solution. Let's look through the second one: Your solution is a DP solution. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. . Code your solution in our custom editor or code in your own environment and upload your solution as a file. If there are multiple possible solutions, you can print any one of them. I thought this was because of an integer overflow so I changed my types to unsigned long long yet the problems still persist. Fibonacci Modified [Medium] Solution. This page list mostly completed solutions. Reload to refresh your session. All caught up! Solve more problems and we will show you more here!Purpose This question comes from a HackerRank problem called Fibonacci Modified. 6 of 6{"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Dynamic Programming/Modified Fibonacci":{"items":[{"name":"Solution. These are the first and second terms, respectively. Editorial. B) There is a mathematical function that can prove whether a number is in the Fibonacci sequence in sqrt (N) time. cpp","path":"DP: Coin Change. {"payload":{"allShortcutsEnabled":false,"fileTree":{"algorithms/dynammic_programming":{"items":[{"name":"candies. Code your solution in our custom editor or code in your own environment and upload your solution as a file. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Project Euler #2 - Even Fibonacci Numbers":{"items":[{"name":"Project_Euler_Problem#2_-_Even_Fibonacci_Numbers. 5 of 6; Submit to see results When you're ready, submit your solution! Remember, you can go back and refine your code anytime. java","path":"Algorithms/Dynamic. So, if the first two terms of the series are 0 and 1: the third term = 1 2 + 0 = 1 fourth term = 1 2 + 1 = 2 fifth term = 2 2 + 1 = 5. HackerRank Solutions in Python3. After these first two elements, each subsequent element is equal to the sum of the previous two elements. e. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"2D Array - DS","path":"2D Array - DS","contentType":"file"},{"name":"A Very Big Sum","path. A question and answers site for programmers to share and discuss their problems and solutions. 6 of 6{"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Dynamic Programming/Fibonacci Modified":{"items":[{"name":"Solution. I'm stuck with this problem on Hackerrank, regarding the dynamic programming in the Algorithms section . As a rule thumb: brute-force is rarely an option. java","path":"Algorithms/Dynamic. Compute the nth term of a Fibonacci sequence. java","path":"Algorithms/Dynamic. : Abbreviation for "Doctor. fourth term = 1 2 + 1 = 2. In this post, we will solve Fibonacci HackerRank Solution. Alex and Fedor invented the following very simple two players game. The question asks how to solve the Fibonacci Modified Hackerrank problem. Problems with similar vi values are similar in nature. My C# solution. Given the initial configurations for matrices, help Sean reverse the rows and. Disclaimer: The above Python Problems are generated by Hacker Rank but the Solutions are Provided by CodingBroz. Fibonacci Modified. We use cookies to ensure you have the best browsing experience on our website. Problem. My HackerRank solutions. js","path. java","path":"Algorithms/Dynamic. Hi, guys in this video share with you the HackerRank Recursion: Fibonacci Numbers problem solution in Python programming | Interview Preparation Kit. The thing to note is that the order of selection of elements doesn’t have a effect on the final outcome of the problem. DYNAMIC PROGRAMMING. An abbreviation is a shortened form of a word or phrase, typically consisting of one or more letters, which is used to represent the full word or phrase login. fifth term = 2 2 + 1 = 5. To see if a date is lucky, Firstly, sequentially concatinate the date, month and year, into a new integer erasing the leading zeroes. The rating for Alice's challenge is the triplet a = (a [0], a [1], a [2]), and the rating for Bob's challenge is the triplet b = (b [0], b [1], b. The Fibonacci sequence begins with and as its first and second terms. You can swap any two elements a limited number of times. Fibonacci Modified. py","path. cpp","contentType":"file"},{"name":"Divisor. Leaderboard. In this post, we will solve HackerRank Alex vs Fedor Problem Solution. java","path":"the-chosen-one/Solution. 6 of 6If you're aware that the Fibonacci series grows even faster than exponentially, it's pretty simple to brute-force this one. For this problem, we have types of queries you can perform on a List: Insert y at index x : Insert x y. A series is defined in the following manner: Given the nth and (n+1)th terms, the (n+2)th can be computed by the following relation T(n+2) = (Tn+1)^2 + T(n) So, if the first two terms of the series are 0 and 1: the third term If a participant submits more than one solution per challenge, then the participant’s score will reflect the highest score achieved. 2020A7PS0152G. Problem. Discussions. Given two dates each in the format dd-mm-yyyy, you have to find the number of lucky dates between them (inclusive). HackerRank Solutions in Python3. HackerRank Fibonacci Numbers Tree problem solution. By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms. can anyone explain how this can be solved using c++ . You are calculating tn by solving the problem from t1 to tn, and recording the results in order to calculate the one you need. This repository collects solutions to the problems I solved at HackerRank. Very easy problem for python users. I then define a method that takes in a. 5 of 6; Submit to see results When you're ready, submit your solution! Remember, you can go back and refine your code anytime. This is a collection of my HackerRank solutions written in Python3. Fibonacci Modified. Memoization means that we keep on storing all the solutions to the subproblems so that we can directly retrieve and use the value wherever we need it in the future in the program. java","contentType":"file. Compute the nth term of a Fibonacci sequence. Programmatically: fibonacci(0) = 0 fibonacci(1) = 1. Leaderboard. Fibonacci Modified. So, the sequence begins 0, 1, 1, 2. . Submissions. Connected Cells In A Grid [Medium] Solution. The correct solution to the original Project Euler problem was found in less than 0. Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this siteIn this HackerRank Cut #1 problem solution we have Given N lines of input, print the 3rd character from each line as a new line of output. md","contentType":"file"},{"name":"a sparse matrix. Compute the nth term of a Fibonacci sequence. java","path":"Algorithms/Dynamic. Return to all comments →. HackerRank Luck Balance Interview preparation kit solution in java python c++ c and javascript programming language practical program code example{"payload":{"allShortcutsEnabled":false,"fileTree":{"java-generics":{"items":[{"name":"Solution. In my opinion, Hackerrank's modified problems are usually a lot harder to solve. Return YES if they are or NO if they are not. Let us first use a simple power method to find the cube of the number from the Fibonacci series. Benchmark. 5 of 6; Submit to see results When you're ready, submit your solution! Remember, you can go back and refine your code anytime. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Dynamic Programming/Modified Fibonacci":{"items":[{"name":"Solution. 5 of 6; Submit to see results When you're ready, submit your solution! Remember, you can go back and refine your code anytime. I am able to solve this question only when the iteration goes to 8 anything pass that and it starts returning a large negative number. 5 of 6; Submit to see results When you're ready, submit your solution! Remember, you can go back and refine your code anytime. Some other problems on Fibonacci Numbers. Scanner s = new Scanner ( System. 6 of 6 {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"README. Attempts: 3848 Challenges: 1 Last Score: -. java","path":"algorithms/dynammic_programming/candies. The Fibonacci sequence appears in nature all around us, in the arrangement of seeds in a sunflower and the spiral of a nautilus for example. md","path":"README. 8 years ago. If you unlock the editorial, your score will not be counted toward your progress. java","path":"java-stack/Solution. Links Approach. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. py","path. Abbreviation. Hackerrank describes this problem as easy. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. But when we use C++ as the programming language, there is a big issue: even the 64bit data type is not big enough to hold the value. (compiled for x86_64 / Linux, GCC flags: -O3 -march=native -fno-exceptions -fno-rtti -std=gnu++11 . {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Dynamic Programming/Modified Fibonacci":{"items":[{"name":"Solution. If two or more participants achieve the same score, then the tie is broken by the total time. Leaderboard. No need for that young fella 🧐. They use the cpp_int to define the variable. Complete the fibonacciModified function in the editor below. py","contentType":"file"},{"name":"angry-children. Below is the implementation of the. Here is a hand-wavy O(1)-ish solution to PE-2, see comment by @harold :( above. Missing Numbers [Easy] Solution. java","path":"Algorithms/Dynamic. cpp","path":"DP: Coin Change. Please read our cookie policy for more information about how we use cookies. It might not be perfect due to the limitation of my ability and skill, so feel free to make suggestions if you spot something that can be improved. This hackerrank problem is a. A reviewer rates the two challenges, awarding points on a scale from 1 to 100 for three categories: problem clarity, originality, and difficulty. Now add two previous elements and print the next element as 0+1=1. You switched accounts on another tab or window. cpp at master · cielavenir/proconProject Euler 140: Modified Fibonacci golden nuggets. Function. So, I use memoization. Without specific details about the modification through teatv apk mod you are referring to, it's challenging to provide a precise explanation or formula for the "Fibonacci Modified" sequence. I am not going to explain this here. Explanation The first two terms of the sequence are t1 = 0 and t2 = 1, which gives us a modified Fibonacci sequence of {0,1,1,2,5,27,…}. ciel(tyama)'s programming contest solutions (Most of codeiq solutions are isolated to another repo) - procon/fibonacci-finding-easy. You signed in with another tab or window. Also every element can be given two choices at any point of time. cris_kgl. Example 1: Input: n = 2 Output: 1 Explanation: F(2) = F(1) + F(0) = 1 + 0 = 1. Feel free to ask a question and you will receive the best advice/suggestion related to anything you ask about software-engineering , development and programming problems . cpp","contentType":"file"},{"name":"Divisor. The answers suggest using big integers, unsigned integers, or BigInteger class for the input and output. . The cut command performs operations on each line it reads. cpp","path":"Algorithms/Dynamic Programming/Bricks. declare t_Nminus2 := t1 // function parameter declare. 3. I am able to solve this question only when the iteration goes to 8 anything pass that and it starts returning a large negative number. The nth and (n+1)th terms, the (n+2)th can be computed by the following relation : Tn+2 = (Tn+1)2 + TnThe code defines a function Fibonacci(n) that calculates the nth Fibonacci number recursively. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. Note: Hackerrank has strict execution time limits (typically 2 seconds for C++ code) and often a much wider input range than the original problem. I am mostly using the inject method. Write a program that prints a staircase of size n. HackerEarth Fibonacci with GCD problem solution. 2020. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. HackerRank solutions in Java/JS/Python/C++/C#. {"payload":{"allShortcutsEnabled":false,"fileTree":{"java-stack":{"items":[{"name":"Solution. java","path":"Algorithms/Dynamic. Nothing special work was done about working with number representation – store it as is in a base 10 in a vector. {"payload":{"allShortcutsEnabled":false,"fileTree":{"solution/practice/algorithms/dynamic-programming/fibonacci-modified":{"items":[{"name":"solution. Code your solution in our custom editor or code in your own environment and upload your solution as a file. java","path":"Algorithms/Dynamic. You are viewing a single comment's thread. Algorithm for Fibonacci Series using recursion in JavaCompute the nth term of a Fibonacci sequence. This editorial requires unlocking. split ()). py","path. Submissions. Task Given the starter code, complete the Fibonacci function to return the Nth term. The goal of this series is to keep the code as concise and efficient as possible. In my opinion, Hackerrank's modified problems are usually a lot harder to solve.