Please read ourHackerRank Algorithms Solutions. Cut a. Once sorted, print the following lines:. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Easy":{"items":[{"name":"A very big sum. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"README. Implementation":{"items":[{"name":"001. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"2D Arrays","path":"2D Arrays","contentType":"file"},{"name":"A Very Big Sum","path":"A Very. porter@nasa. Strings. public. md","contentType":"file"},{"name":"apples_and_oranges. This is a pythonesque solution by Jay Mistry. Posts navigation. Solution:{"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/03. All HackerRank solutions. Submissions. Code your solution in our custom editor or code in your own environment and upload your solution as a file. This video contains solution to HackerRank "Mars Exploration" problem. For example, given input and , we find instances of ', of ' ' and of ' '. For each of the subsequent words, the first letter is uppercase and rest of the letters. For each query string, determine how many times it occurs in the list of input strings. Leaderboard. Mars Exploration. Cut a subtree consisting of all nodes which are not further than r units from node x . vscode","contentType":"directory"},{"name":". java","path":"Easy/A very big sum. Please read our{"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"2D_Array_DS. September 201631. Contributions. Mars Exploration Hackerrank Solution - java 8| Hackerrank Algorithm. Given the signal received by Earth as a string, , determine how many letters of Sami's SOS have been changed by radiation. She must buy the house in one year and sell it in another, and she must do so at a loss. Code your solution in our custom editor or code in your own environment and upload your solution as a file. Please read ourLocked stub code in the Solution class handles the following input from stdin: . md. . View Solution →. Solution. Then I checked for each triplet if first character is equal to S, second to O and third to S. This is a string algorithms HackerRank problem, which we'll solve via a while loop. py","path":"Algorithms/Strings/alternating. Editorial. VDOMDHTMLtml> MARS EXPLORATION | HACKERRANK | PROBLEM SOLVING | PYTHON | LOGIC AND SOLUTION - YouTube This video contains solution to HackerRank "Mars Exploration". Problem. Users can also see exactly when the post was published, i. java","path":"Algorithms/Game Theory/Tower. She wants to minimize her financial loss. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"README. 6 of 6{"payload":{"allShortcutsEnabled":false,"fileTree":{"HackerRankDashboard/CoreCS/Algorithms/src/main/java/com/javaaid/hackerrank/solutions/algorithms/strings":{"items. [Mars Exploration] 15 [Solution. cost: an integer array denoting the cost of each flavor of ice cream. We use cookies to ensure you have the best browsing experience on our website. HackerRank Solutions. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Easy":{"items":[{"name":"A very big sum. Link. It should return an array containing the indices of the prices of the two flavors they buy, sorted ascending. See the problem statement, the code snippets, and the explanations for. The levels are numbered from bottom to top: Task Given the borders of array subsegment , find its decomposition into a minimal number of nodes of a square-ten tree. 0. In this HackerRank Time Delta problem solution in python, When users post an update on social media,such as a URL, image, status update etc. Since sorting is a simple problem with many different possible solutions, it is often used to introduce the study of. before looking at the solution you need to try the problem once for bui. Note -The Height of binary tree with single node is taken as zero. Sort the array. For the purposes of this challenge, we define a binary tree to be a binary search tree with the following ordering requirements: The value of every node in a node's left subtree is less than the data value of that node. and in the case of a rotation by 3, w, x, y, and z would map to z, a, b and c. e. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms":{"items":[{"name":"README. Complete the function has_cycle in the editor below. Subscribe. For. To review, open the file in an editor that reveals hidden Unicode characters. Maximum Element HackerRank Solution. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. Consider an undirected graph where each edge is the same weight. where is the number of swaps that took place. Source – Java-aid’s repository. - GitHub - mrmtz01/HackerRank-Exercises: Solution to the exercises of the second week of the hackerrank kit, from Lonely Interger to Mars Exploration. Code your solution in our custom editor or code in your own environment and upload your solution as a file. Janet Sudnik / Molly Porter. ; For each of the subsequent words, the first letter is uppercase and rest of the letters are lowercase. And counted the changed letters. Home; About; Contact;. Baskar Karunanithi 6th June 2021 Leave a Comment. We use cookies to ensure you have the best browsing experience on our website. // If there are an odd number of "x" values. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Discussions. Solution. Please read ourInitially a = 0 means "hackerrank" [0] = "h". An array is a type of data structure that stores elements of the same type in a contiguous block of memory. I think thanks to Elon Mask, humanity will be able to build a colony on Mars. Big Sorting HackerRank Solution in C, C++, Java, Python. What we are actually doing is storing ever element from left to right, by comparing it to the numbers on its left. // 1 more beautiful pair. If you want solution of any specific HackerRank Challenge mention it down the comment box, we will provide the solution as. contests: a 2D array of integers where each contains two integers that represent the luck. After finding "h" it will increase a and now "hackerrank" [1] = "a" which means it will start searching "a" in rest of the string then "c" then "k" up to the end. Hackerrank – Problem Statement. 5 of 6; Submit to see results When you're ready, submit your solution! Remember, you can go back and refine your code anytime. Implementation":{"items":[{"name":"001. java","path":"Algorithms/Strings/Super. Ignore case. ; Last Element: lastElementWe use cookies to ensure you have the best browsing experience on our website. 6 of 6 {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/02. // We know that a number XORed with itself is 0. luckBalance has the following parameter (s): k: the number of important contests Lena can lose. 1. I divided the whole string into to 3-character parts. sudnik@nasa. Sock Merchant. Peruse Marc S Cakewalk Hackerrank Solution Java 8 Hackerrank Algorithms trade goods, offerings, and more in your neighborhood area. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Problem Solving-Algorithms/Strings":{"items":[{"name":"Alternating Characters. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. " If found helpful please press a ⭐. #include <cstdio>. function alternatingCharacters (s) { let res = s. Algorithms. e. Submissions. Please read our We use cookies to ensure you have the best browsing experience on our website. Feb 26, 2020. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Strings/Mars Exploration":{"items":[{"name":"Solution. Julius Caesar protected his confidential information by encrypting it using a cipher. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Easy":{"items":[{"name":"A very big sum. Starting with a 1-indexed array of zeros and a list of operations, for each operation add a value to each of the array element between two given indices, inclusive. Merge Sort: Counting Inversions HackerRank Solution. Code your solution in our custom editor or code in your own environment and upload your solution as a file. e. md","path":"README. Letters in some of the SOS messages are altered by cosmic radiation during transmission. After the lines of phone book entries, there are an unknown number of lines of queries. The Solutions are provided in 5 languages i. HackerRank Minimum Loss problem solution. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"C++_Code","path":"C++_Code","contentType":"directory"},{"name":"Breaking the Records. DFS: Connected Cell in a Grid HackerRank Solution; Hash Tables: Ice Cream Parlor HackerRank Solution; Merge Sort: Counting Inversions HackerRank Solution; Sorting: Comparator HackerRank Solution; Sorting: Bubble Sort HackerRank Solution; Tries: Contacts HackerRank Solution; Heaps: Find the Running Median HackerRank SolutionArrays - DS HackerRank Solution. . Please read our ","renderedFileInfo":null,"shortPath":null,"tabSize":8,"topBannersInfo":{"overridingGlobalFundingFile":false,"globalPreferredFundingPath":null,"repoOwner. Link. We use cookies to ensure you have the best browsing experience on our website. A space explorer's ship crashed on Mars! Caesar Cipher HackerRank Solution in C, C++, Java, Python. cpp","path. We use cookies to ensure you have the best browsing experience on our website. Solutions. September 201631. A space explorer's ship crashed on Mars! They send a series of SOS messages to Earth for help. md","path":"ReadMe. For each query, we add an element to our return array, . Louise always starts. 52K subscribers. and feel free to comment down if you have any doubts. Please read ourMars Exploration Sami’s spaceship crashed on Mars!. py. , ). Once all operations have been performed, return the maximum value in your array. Each time Sunny and Johnny take a trip to the Ice Cream Parlor, they pool their money to buy ice cream. Here's my solution in python def marsExploration ( s ) : count = 0 s1 = int ( len ( s ) / 3 ) * "SOS" for i in range ( 0 , len ( s )) : if s [ i ] != s1 [ i ] : count = count + 1 return cnt ; } 0 | 83 - Mars Exploration | Strings | Hackerrank Solution | Python. A dual rotor system for the next generation of Mars helicopters is tested in the 25-Foot Space Simulator at NASA’s Jet Propulsion Laboratory on Sept. A description of the problem can be found on Hackerrank. Solution. floor (people / 2) result += half people = 3 * half. 2. Choose a node, x , from the tree. For example, in the following graph there is a cycle formed when node points back to node . Today, we're learning about Interfaces. Instead of calculating the subarrays directly, // we calculate the number of times each number appears in any subarray. A description of the problem can be found on Hackerrank. Check out the Tutorial tab for learning materials and an instructional video! Given a string, , of length that is indexed from to , print its even-indexed and odd-indexed characters as space. Given the signal received by Earth as a string, s, determine how many letters of SOS. In this HackerRank Alternating Characters Interview preparation kit problem You are given a string. The first value is a friend's name, and the second value is an -digit phone number. Two brackets are considered to be a matched pair if the an opening bracket (i. Mars Exploration. java","contentType":"file"},{"name. The goal of the game is to maximize the sum of the elements in the n x n submatrix located in the upper. java","contentType":"file"},{"name. java","path":"Algorithms/Strings. In a game challenge, the participant's score will reflect the last code submission. Please read our1 Answer. The right to left diagonal = 3+5+9=17. com problems in many languages. Code your solution in our custom editor or code in your own environment and upload your solution as a file. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Strings/Morgan and a String":{"items":[{"name":"Solution. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"3D surface area hackerrank","path":"3D surface area hackerrank","contentType":"file"},{"name. You have an empty sequence, and you will be given queries. Today, we're taking what we learned yesterday about Inheritance and extending it to Abstract Classes. // ADDITION. We use cookies to ensure you have the best browsing experience on our website. janet. The challenge. Discover a diverse selection of Hackerrank S 3 Month Prep Kit Challenge Java Mars Exploration Solution Explained In Detail advertisements on our premium site. The value of every node in a node's right subtree is greater than the data value of that node. Hackerrank - Mars Exploration Solution. And counted the changed letters. . My solutions (using JAVA) for Hackerrank problems. This editorial requires unlocking. Mars Exploration HackerRank Solution in C, C++, Java, Python. ; Create an integer, , and initialize it to . A space explorer’s ship crashed on Mars! They send a series of SOS messages to Earth for help. has_cycle has the following. Check out the Tutorial tab for learning materials and an instructional video!. 6 of 6{"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/02. We want to see. DFS: Connected Cell in a Grid HackerRank Solution; Hash Tables: Ice Cream Parlor HackerRank Solution; Merge Sort: Counting Inversions HackerRank Solution; Sorting: Comparator HackerRank Solution; Sorting: Bubble Sort HackerRank Solution; Tries: Contacts HackerRank Solution; Heaps: Find the Running Median HackerRank Solution{"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"3D surface area hackerrank","path":"3D surface area hackerrank","contentType":"file"},{"name. The Fibonacci sequence begins with and as its first and second terms. Each of the nodes is labeled consecutively. Given an array, , of integers, print each element in reverse. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Strings/MarsExploration":{"items":[{"name":"solution. A space explorer’s ship crashed on Mars! They send a series of SOS messages to Earth for help. Please read our Learn how to solve the HackerRank Mars Exploration problem using Python, Java, C, and JavaScript programming languages. {"payload":{"allShortcutsEnabled":false,"fileTree":{"ProblemSolving/Python/Implementation":{"items":[{"name":"acm_icpc_team. Tree: Huffman Decoding HackerRank Solution. In this HackerRank Pangrams, problem Given a sentence determines whether it is a pangram in the English alphabet. Complete the implementation of Calculator class. The award brings NASA a step closer to the first robotic round trip to bring samples safely to Earth through the Mars Sample Return Program. ]. This video contains solution to HackerRank "Mars Exploration" problem. She wants to cut a subtree (i. Given an array, , of integers and an array, , representing the respective frequencies of 's elements,. Problem Link:- /* * Author:- Rahul Malhotra * Source:- Programming Vidya * Description:- Solution for HackerR… {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Strings":{"items":[{"name":"alternating-characters. Therefore, we add %26 (which equals len. Mars Exploration. Complete the inOrder function in your editor below, which has parameter: a pointer to the root of a binary tree. Please read our 10Days of JS 30Days of Code Algorithm Android Debug Bridge Android Debugging Basic for Web Blog Browsers Chrome으로 Android Debugging 방법 Correctness and the Loop Invariant hackerrank solution in javascript Debug Tools Development Environment in MacOS ES6 Front-End Funny String of Algorithms hackerrank solution in javascript Funny String. Solutions. This is definitely not an easy question. Therefore, we add %26 (which equals len. Please read our{"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Strings/Mars Exploration":{"items":[{"name":"Solution. , a connected part of the original tree) of radius r from this tree by performing the following two steps: 1. Task Given an array, , of size distinct elements, sort the array in ascending order using the Bubble Sort algorithm above. Please read ourOnce that's done, we must dequeue the first character from the queue and pop the top character off the stack, then compare the two characters to see if they are the same; as long as the characters match, we continue dequeueing, popping, and comparing each character until our containers are empty (a non-match means isn't a palindrome). A spaceship is sent to Mars but crashes. CI/CD & Automation DevOps DevSecOps Case Studies. Each query is one of these three types: 1 x -Push the element x into the stack. c","path":"Problem Solving/1D Arrays in C. One more thing to add, don’t directly look for the solutions, first try to solve the problems of Hackerrank by yourself. Mars Exploration. strip ()] a = [l for l in a if l in b] b = [l for l in b if l in a]. md","contentType":"file"},{"name":"absolute_permutation. It's time to go with Competitive Coding through one of the best coding platforms HackerRank. Editorial. In this post, we will solve HackerRank Insertion Sort – Part 1 Problem 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. Objective In this challenge, we practice calculating the interquartile range. Mars Exploration HackerRank Solution in C, C++, Java, Python. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. Hash Tables; Ransom Note. Array is sorted in numSwaps swaps. java","contentType":"file"},{"name. java","contentType":"file"},{"name. a. Letters in some of the SOS messages are altered by cosmic radiation during transmission. Mars Exploration. Complete the luckBalance function in the editor below. // For an element in A, if there's a matching element in B, this creates a "beautiful pair". If a participant submits more than one solution per challenge, then the participant’s score will reflect the highest score achieved. java","path":"Algorithms/Game Theory/Game of. ; Urn contains red balls and black balls. Customer Stories. If Marc has eaten cupcakes so far, after eating a cupcake with calories he must walk at least miles to maintain his weight. A description of the problem can be found on Hackerrank. , a connected part of the original tree) of radius r from this tree by performing the following two steps: 1. If I reached position 0 I printed the remaining enenergy. If you find any difficulty after trying several times, then you can look for solutions. Strings":{"items":[{"name":"001. py. Complexity: time complexity is O(N) space complexity is O(1) Execution: We know that the message is basically a lot of concatenated SOS strings. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Easy":{"items":[{"name":"A very big sum. Link. solución ejercicio hackerRank mars exploration. Alice wrote a sequence of words in CamelCase as a string of letters, , having the following properties: It is a concatenation of one or more words consisting of English letters. You are viewing a single comment's thread. 5 of 6; Submit to see results When you're ready, submit your solution! Remember, you can go back and refine your code anytime. cs","path":"Algorithms/Strings/Mars Exploration. We use cookies to ensure you have the best browsing experience on our website. java","path":"Algorithms/Implementation. I created solution in: Scala;. DFS: Connected Cell in a Grid HackerRank Solution; Hash Tables: Ice Cream Parlor HackerRank Solution; Merge Sort: Counting Inversions HackerRank Solution; Sorting: Comparator HackerRank Solution; Sorting: Bubble Sort HackerRank Solution; Tries: Contacts HackerRank Solution; Heaps: Find the Running Median HackerRank Solution{"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"ReadMe. [MySQL Solution] Aggregation. Sock Merchant. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Strings/Sherlock and Valid String":{"items":[{"name":"Solution. Solution. Maintenance - Each iteration of the loop expands the subarray, but keeps the sorted property. The running time of an algorithm for a specific input depends on the number of operations executed. cpp. A description of the problem can be found on Hackerrank. August 2017 Pavol Pidanič 2 Comments. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. , ), ], or }) of the exact same type. Add a contact named hackerrank. // To maximize A xor B, we want A and B to differ as much as possible at every bit index. I divided the whole string into to 3-character parts. We use cookies to ensure you have the best browsing experience on our website. Function Description. getHeight or height has the following parameter (s): root: a reference to the root of a binary tree. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. Hackerrank – Problem Statement. Solutions. Raw Blame. In this HackerRank Calendar Module problem solution in python, The calendar module allows you to output calendars and provides additional useful functions for them. py","path":"ProblemSolving/Python/Strings/anagram. Grid Challenge HackerRank Solution. e. Day 19: Interfaces HackerRank Solution. Please read our 1 Answer. Given an input stream of integers, you must perform the following task for each integer: Add the integer to a running list of integers. It is a concatenation of one or more words consisting of English letters. 6 of 6Day 14: Scope HackerRank Solution; Day 13: Abstract Classes HackerRank Solution; Day 12: Inheritance HackerRank Solution; Day 11: 2D Arrays HackerRank Solution; Day 10: Binary Numbers HackerRank Solution; Day 9: Recursion 3 HackerRank Solution; Day 8: Dictionaries and Maps HackerRank Solution; Day 7: Arrays HackerRank SolutionDay 13: Abstract Classes HackerRank Solution. Solutions Wait! Have you challenged yourself with this problem? If yes, click here to show the solution. You will be given a number of queries. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. In this HackerRank Diagonal Difference problem solution Given a square matrix, calculate the absolute difference between the sums of its diagonals. py","path":"Algorithms/02. py","path":"algorithms/3d-surface-area. Letters in some of the SOS messages are altered by cosmic radiation during transmission. md","path":"ReadMe. Code your solution in our custom editor or code in your own environment and upload your solution as a file. Day 14: Scope HackerRank Solution. A linked list is said to contain a cycle if any node is visited more than once while traversing the list. HackerRank | Prepare; Certify; Compete; Apply; Hiring developers? Log In; Sign Up; Prepare. We recommend you complete the Quartiles challenge before attempting this problem. In this HackerRank Gemstones problem you have Given a list of minerals embedded in each of the rocks, display the number of types of gemstones in the collection. HackerRank Two Characters problem solution. In the previous challenge, you wrote a partition method to split an array into two sub-arrays, one containing smaller elements and one containing larger elements than a given. e. , (, [, or {) occurs to the left of a closing bracket (i. Determine which type of bird in a flock occurs at the highest frequency. m. To review, open the file in an editor that reveals hidden Unicode characters. There is a collection of input strings and a collection of query strings. We use cookies to ensure you have the best browsing experience on our website. The Algorithms Domain Falls under a broader Problem Solving Skill Set in HackerRank which consists of both Data Structures and Algorithms. py","path. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. Home Codility Solutions HackerRank Solutions Search About Archive. 25 lines (20 sloc) 434 Bytes. Mars Exploration. Problem solution in Python programming. YASH PAL March 13, 2021. Solved problems of HackerRank. Code your solution in our custom editor or code in your own environment and upload your solution as a file. Time Complexity: O (n) //entire string traversal is required once. cs","path":"Algorithms/Strings/Caesar Cipher. We use cookies to ensure you have the best browsing experience on our website. The left-to-right diagonal = 1+5+9 = 15. Mars Exploration is a problem statement chosen from HackerrankThis hackerrank problem is a part of Practice | Algorithms| Implementation | Mars Exploration h. HackerRank Big Sorting problem solution. 694 views 1 year ago Hackerrank Algorithms And. Given the signal received by Earth as a string, , determine how many letters of Sami's SOS have been changed by radiation. {"payload":{"allShortcutsEnabled":false,"fileTree":{"":{"items":[{"name":"A frog jumping(1077A)","path":"A frog jumping(1077A)","contentType":"file"},{"name":"AI. We use cookies to ensure you have the best browsing experience on our website. c","contentType. {"payload":{"allShortcutsEnabled":false,"fileTree":{"ProblemSolving/Python/Strings":{"items":[{"name":"anagram. Consider an array of numeric strings where each string is a positive number with anywhere from to 10^6 digits. Comment. Mars Exploration. Please read ourContribute to Robinrai2612/Hackerrank-solutions-python- development by creating an account on GitHub. We use cookies to ensure you have the best browsing experience on our website. if a becomes 9 we can just break the loop and print. Solutions For. Check out the Tutorial tab for learning materials and an instructional video! The absolute difference between two integers, and , is written as . py","path":"ProblemSolving/Python/Strings/anagram. HackerRank in a String! problem solution in java python c++ c and javascript programming language with practical program code example explaination. 4 of 6; Test your code You can compile your code and test it for errors and accuracy before submitting. // Additionaly, We MUST change exactly 1 element in B. Then I checked for each triplet if first character is equal to S, second to O and third to S. YASH PAL January 30, 2021. Because this is a very specific Object-Oriented concept, submissions are limited to the few languages that use this construct. Complexity: time complexity is O(N) space. Problem solution in Python programming. py","path":"Algorithms/Strings/alternating. After you create a representation of the graph, you must. In this post, we will solve HackerRank Flipping the Matrix Problem Solution. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Strings/Beautiful Binary String":{"items":[{"name":"Solution. It should return an array of integers where each value is the number of occurrences of the element's index value in the original array. We use cookies to ensure you have the best browsing experience on our website. c This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. Please Do like, Comment and. In this HackerRank Zig Zag Sequence problem solution, the task is to debug the existing code to successfully execute all provided test files. It must print the values in the tree's inorder traversal as a single line of space-separated values. This is a string algorithms HackerRank problem, which we'll solve via a while loop. // We first find the most significant bit that we can force to differ by looking at L and R. Hackerrank – Problem Statement. md","contentType":"file"},{"name":"a-very-big. {"payload":{"allShortcutsEnabled":false,"fileTree":{"Algorithms/Strings/Beautiful Binary String":{"items":[{"name":"Solution. py","path. e. I will write an essay about this person and his space x company. Mars Exploration. Code your solution in our custom editor or code in your own environment and upload your solution as a file. .