Smallest negative balance hackerrank

smallest negative balance hackerrank main (ExceptionHandling. At the age of 24, Vivek Ravisankar cofounded HackerRank, and currently works as its CEO. Ex: -7,4,6, –4, 8,6, -3 output: -7,-4, -3, 4,6,6,8; Count negative number from row and column sorted 2D array. CodeChef was created as a platform to help programmers make it big in the world of algorithms, computer programming, and programming contests. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree. Jan 13, 2020 · Solution steps. 58 which is pretty weird. 99·10-23, or 2. Step 1: Divide. 🚀 Array - fizz buzz, subset sum, two-sum, find an element. We realize work-life balance could mean a lot of things to different people. Just dont give up, you have all what it takes to become a really good coder. Feb 23, 2019 · Complete the luckBalance function in the editor below. Needless to say, attacking a negative comment with more negativity is anything but productive. org. Here is a small program for checking if the parentheses are balanced or not. Lena is preparing for an important coding competition This value may be negative. 2006. , Suppose we have a data with 100 labels with 0’s and 900 labels with 1’s, here the minority class 0’s, what we do is we balance the data from 9:1 ratio to 1:1 ratio i. Revenue: $5 to $10 billion (USD) Intuit is a global technology platform that helps our customers and communities overcome their most important financial challenges. 2, Technical Round But perhaps the biggest advantage is the ability to grow on the platform. Our programming contests have prizes worth up to INR 20,000 (for Indian Community), $700 (for Global Community) and lots more CodeChef goodies up for grabs. The Overflow Blog Choosing Java instead of C++ for low-latency systems There are contests. UPS Freight Less-than-Truckload (“LTL”) transportation services are offered by TFI International Inc. It should return an integer that represents the maximum luck balance achievable. 6 -4 3 -9 0 4 1 Sample Output. Check out Part 2 for a step-by-step by guide on how to create a tech talent brand. HackerRank Solutions. Toluna lets me voice my opinion, which is something I love to do. Revenue: $2 to $5 billion (USD) Twitter serves the public conversation because conversation is a force for good in the world. Questions : 20, Duration : 1200 Seconds. The interviews are a mix of coding and design questions, some of which are: 🚀 Design - game of war, tic-tac-toe, minesweeper. Anonymous User. Mar 08, 2021 · How to find the smallest number with given digit sum s and number of digits d ? Input : s = 9, d = 2 Output : 18 There are many other possible numbers like 45, 54, 90, etc with sum of digits as 9 and number of digits as 2. Answer Question Genshin is an open-world action role-playing game. Factors of 4 are 1,2 and 4. Sign in - Google Accounts. denotes the contest's importance rating. * elements in the given array. There are positive numbers, negative numbers, and zero in the array. The standard C++ library for Input/Output operations. For example: Assume arr = [5,7,4,3,8] The pivot is at arr [0] = 5. Return Value Input one whole number (negative or positive) and output its final fully exploded form. The smallest of them is 18. Nov 22, 2018 · The above small analysis shows that the person is actually a 45 years old male and already has a credit card with high credit score and a balance of almost 123 K. Jan 07, 2021 · Complete the luckBalance function in the editor below. Join Coursera for free and learn online. Replace Font Awesome with modern line icons with a single line of code. Time series are not linear, consider the temperature over the year, it follows a sinusoidal motion, the value is affected by many factors 1. Mar 09, 2019 · When the number is divided by 2 and the balance becomes zero and the above number is called as the even number – eg 2,4,6,8,10. Eg. Validating forecasts. I was happy with that balance. Computer Hardware & Software. Aug 10, 2020 · E. After division, subtract the resultant amount of 500 . AOneCode Coding Bootcamp | Programming Interview Questions + Help Getting Job Offers. I needed to share my screen and I could use any planning/drawing tool. For this case there exists a very simple algorithm. Too bad for them. We basically process this array for every currency, that is, for every currency we run a . Given the group debt records (including the borrower name, lender name, and debt amount), who in the group has the smallest negative balance? Challenge Walkthrough Let's walk through this sample challenge and explore the features of the code editor. The device enables you to conclude either that the contents of the dishes weigh the same or that the dish that falls lower has heavier contents than the other. 99e-23 in Python. C--> -$7 (Borrowed from B) + $5 (Lend to A) So C's Total Balance = -$2. each. Rotate Array by k numbers of positions Aug 21, 2019 · Below is a list of the Most Common Procurement Problems we encounter across various organizations & Their Solution offering simple ways to fix them. 1. Jan 18, 2021 · 170 Machine Learning Interview Questions and Answer for 2021. The first problem can be solved in [math]O(N\cdot\log(N))[/math] time per test case. Create a great job ad. Given a sequence of non-negative integers a 0, …, a n − 1, find the maximum pairwise product, that is, the largest integer that can be obtained by multiplying two different elements from the sequence (or, more formally, max 0 ≤ i ≠ j ≤ n − 1 a i a j). while ( number > 0) Now we compare the reversed number with the original number. If nothing happens, download GitHub Desktop and try again. 3) currently working at Google/Facebook or other top tier companies. ” Obviously, you want to find the good places to work, those that are actively supportive of women. The Deposit and Withdraw methods will deposit or withdraw the correct amount, respectively. Include the following members: Create a class Account that stores customer name, account number and type of account. How do you balance life and work? It is essential to keep a healthy work/life balance to prevent burnout. Learn how to hire technical talent from anywhere! May 01, 2021 · When processed with 5, it becomes 6 When processed with 3, it becomes 9 When processed with 2, it becomes 16 When processed with 4, it becomes 28 We always get a positive number. * element. Input : s = 20, d = 3 Output : 299. All of Google. Jun 01, 2020 · A decimal representing of the fraction of negative numbers in the array compared to its size. Nov 08, 2019 · Initially, her luck balance is 0. Luck Balance - Hacker Rank Solution. Each contest is described by two integers, L[i] and T[i]: L[i] is the amount of luck associated with a contest. For example, height of tree given below is 5, distance between node (10) and node (8). Learn how supply and demand determine prices, how companies think about competition, and more! We hit the traditional topics from a college-level microeconomics course. Bracket balance checker in Python. Create account. number = number / 10. Jan 09, 2017 · Introduction . What we need from you: 1) at least 2 hours a week (PST workdays after 7PM or the whole day weekends) 2) at least 5+ years experience. Initially \(\text{depth} = 0\). 166667 Explanation. …. SQL stands for Structured Query Language. If there is one language every data science professional should know – it is SQL. Algorithm: We make an Array to store the result of smaller subproblems, say dp, of size amount + 1, because at ith index we store the number of ways to pay an amount = i, so for the having an index ‘amount’ we need to make an array of amount + 1 size. and on the other sides when it is divided by 2 and balance becomes 1 they are called odd numbers or uneven numbers. Code, compile, run, and host in 50+ programming languages. If Lena wins the contest, her luck balance will decrease by L[i]; if she loses it, her luck balance will increase by L[i]. Developers want to work for managers that focus on output, not time spent in the office chair. Design a class to represent a bank account. 🚀 Linked list - remove a node, create a linked list, find the middle element. y − This is also a numeric expression. From. at com. ×. 17. 124 HackerRank reviews. e. Biggest Failures. A free inside look at company reviews and salaries posted anonymously by employees. Park and after almost one month of the interview process was told the feedback was negative. D. Jun 15, 2020 · “balanced parentheses java hackerrank” Code Answer balanced brackets hackerrank solution in cpp cpp by Lucky Lyrebird on Jun 15 2020 Comment Jan 07, 2021 · Complete the luckBalance function in the editor below. Sort the input array. The majority of the solutions are in Python 2. gcd (0, 0) = 0. Again iterate over the sorted array and check if the absolute difference between the neighboring elements is equal to the minimum absolute difference. Observe that there is an optimal placement of two vertical lines each of which go through some segment endpoints 2. In this tutorial, we will learn about the concept of determining whether the input string of brackets is balanced or not using Stack, in the C++ programming language. A Machine Learning interview calls for a rigorous interview process where the candidates are judged on various aspects such as technical and programming skills, knowledge of methods, and clarity of basic concepts. And according to a HackerRank study involving 2,000 female professional software developers, “the gender gap for when developers learn to code is slowly but surely shrinking. Sep 30, 2018 · I solved the Hackerrank Luck Balance problem the "C" way (I am much more used to C) and I wanted to know if there were any C++ features I could have used that would have made my code more concise/n. B--> +$2 (Lend to A)-$5 (Borrowed from A) +$7 (Lend to C) So B's Total Balance = +$4. This program allows users to create groups that show all records of debts between the group members. There was a problem preparing your codespace, please try again. 🚀 Trees - add elements, balance. See the complete profile on LinkedIn and discover . 1 of 6 Review the problem statement Each challenge has a problem statement that includes sample inputs and outputs. Using JUnit 4's Assert class, write tests for the Account class that cover the following cases: The deposit and withdraw methods will not accept negative numbers. The size and spatial distribution of the samples are important for proper representation of the total pixel population in terms of the samples 16 GNR401 Dr. Learn and Practice on almost all coding interview questions asked historically and get referred to the best tech companies Jan 14, 2021 · Append lastDigit to reverse. First of all, what do we mean by height of binary search tree or height of binary tree? Height of tree is the maximum distance between the root node and any leaf node of the tree. In the main () method, I am handling exceptions using the try-catch block in the . Become An Interviewer. If amount is greater than 500 then, divide amount by 500 to get maximum 500 notes required. My friends can vouch for that. One account. Play Quiz. str. i. When I enjoy what I do it doesn't feel like a chore. In above question, we need to extract the first word of string so value of count would be 1 and string variable is “name”. Note that we have multiple lea nodes, however we chose the node which s . (Any money you had in your Venmo account before you verified your identity will automatically be available on your new Venmo balance. Smallest Negative Balance You are working on a new application for recording debts. level 1. Let gcd (a, b) be the largest positive integer that divides both a and b. You need to count the number of special. Put yourself up for recognition and win great prizes. I . Amazon OA2 New Grad - LeetCode Discuss. 17 Most Common Procurement Problems. We help companies accurately assess, interview, and hire top developers for a myriad of roles. Aylup. Over the course of the next few (actually many) days, I will be posting the solutions to previous Hacker Rank challenges. · 10m. The method signature uses the throws keyword to let the caller know the type of exceptions it might throw. For the 3rd I was able to get fragments of the solution working but not . If Lena wins the contest, her luck balance will decrease by ; if she loses it, her luck balance will increase by . I was afraid if I made it longer than 5 mins we'd filter out good candidates who couldn't be bothered with our bullshit. A decimal representing of the fraction of zeros in the array compared to its size. Then, you’ll have access to a Venmo balance, which means you can use the money you’ve received to make payments. Active 2 years ago. All Paths From Source to Target. AreEqual method, write tests for the Account class that cover the following cases: The Deposit and Withdraw methods will not accept negative numbers. 2. → Description of the most important classes, functions and objects of the Standard Language Library, with descriptive fully-functional short programs as examples: C library: The popular C library, is also part of the of C++ language library. "Yes, in theory, your number of years of . Also dont put too much pressure on yourself. Solution. May 29, 2018 · Yes, the school is small, but that doesn't obviate the results. Aug 15, 2021 · Algorithm-Java-programming- Arrays. Smith when at the University of Adelaide. On top of being named one of Google Play’s best games of 2020, it is also one of the top grossing mobile games in the first half of 2021. Provide a brief summary of the situation, your role in the situation, the action you put into place to resolve the issue, and how the issue was resolved as a result. Join InterviewBit now. Oct 17, 2018 · If negative comments are left unanswered, this usually reads like a silent agreement to anyone viewing, including candidates. Account Test. I felt I covered all the cases but some of the hidden test cases didn't pass. Back. Forgot Password? Enter your User Name and we'll send you a link to change your password. Sign in with a different account. A simple explanation, apology or a few kind words can do wonders in changing the thoughts of readers. z − This is also a numeric expression. Input: arr [] = {4 4} Output : 3 Explanation : When processed with 4, it becomes 2 . For each index compare the absolute difference of adjacent elements and update the corresponding minimum. Jul 23, 2015 · Step by step descriptive logic to find minimum number of denomination. In today’s business world, cost still plays a vital role in consumer products. This was a question from hackerrank, and the . We will also put comments on every line of code so you can understand the flow of the program. Sep 21, 2017 · by Yangshun Tay The 30-minute guide to rocking your next coding interviewAndroid statues at Google Mountain View campusDespite scoring decent grades in both my CS101 Algorithm class and my Data Structures class in university, I shudder at the thought of going through a coding interview that focuses on algorithms. dress slacks) 36 % Casual (t-shirt and jeans) 2 % They didn’t have a dress code 1 % Special outfit (e. Account cannot overstep its overdraft limit. 333333 0. I was able to get the right logic to solve the problem for 3/4 of the problems, most test cases succeeded, some failed because they timed out or the recursion depth was exceeded. Get all 44 Hackerrank Solutions C++ programming language with complete updated code, explanation, and output of the solutions. Eight years ago, when we first launched Doximity, I worked to find a balance between being a mother and being the co-founder of a small startup. To balance an array, Emma can add a non-negative integer ( ) to any array element . If you are facing any issue or this is taking too long, please click to join directly. Recommended: Please solve it on “ PRACTICE ” first . At first suppose there is only one type of bracket. Talk to the interviewer about how you can maintain that appropriate balance for yourself. The withdraw and deposit methods return the . Let \(\text{depth}\) be the current number of open brackets. Program to display bank account. Recently I have taken OA2 and I got borrower lender problem to find smallest negative balance. Kind+Jugend 2019 Cologne, 19/22 settembre 2019 HALL . >One high profile false negative anecdote, while unfortunate, doesn't imply there's a widespread or unexpected problem. → The ways used to count the total number of notes in a given amount in C programming are as follows: Using Standard Method. Live Demo. Input one whole number (negative or positive) and output its final fully exploded form. 1 Introduction A random walk is a stochastic sequence {S n}, with S 0 = 0, defined by S n = Xn k=1 X k, where {X k} are independent and identically distributed random variables (i. 496e11 in Python. In the k-smallest integers problem, the weight of an item is itself (or the identity function f(x) = x). Please help me with the solution in Java. journaldev. disk space analysis hackerrank solution python. We are going to explain our hackerrank solutions step by step so there will be no problem to understand the code. Syntax. Jul 27, 2016 · This is the problem: Problem. Microeconomics is all about how individual actors make decisions. Packaged with game is the lore, where the player and other characters weave in and out of story lines. swapcase (); Parameters. Please enter your email address or userHandle. Build skills with courses from top universities like Yale, Michigan, Stanford, and leading companies like Google and IBM. The scales are of the old balance variety. The bottom half of families ranked by household wealth (with $97,000 or less in net worth) own only 1% of the pie. Remove last digit from number. , the distance from the Earth to the Sun is 1. Return Value Oct 24, 2018 · Balance Confidence And Humility. Following is the syntax for min() method −. Complete Italian version is here: it. Amazon OA2 New Grad. May 02, 2021 · Surprisingly, some people choke on this question. A Synopsis of The Current State of Software Engineering Interviews. Input amount from user. Remove Duplicates from Sorted Array II. Take part in our 10 days long monthly coding contest and the shorter format Cook-off and Lunchtime coding contests. Example Input 53618 Example Output 5335013505 Example Explanation Digits 5, 3 and 1 will not react but 6 will be replaced with 37 and 8 will be replaced by 65 to give an exploded form of 5337165. This introduction to R is derived from an original set of notes describing the S and S-PLUS environments written in 1990–2 by Bill Venables and David M. Ask Question Asked 2 years ago. The only difference between the k-smallest integers and the k-closest points is that there is a different way of measuring “distance” or “weight”. Rewards : Top 25 winners will be provided Digital certificates signed by Head of NCW. This is a time where you would’ve generated a lot of ideas in collaboration with a team, in a short span of time and solved lots of problems. We help give over 50 million consumer, small business and self-employed customers around the world the opportunity to prosper. 1) Only one disk can be moved at a time. . A great way to demonstrate that you can work well with a team in a ‘tech’ environment while also generating positive outcomes for your team. Advance your career with degrees, certificates, Specializations, &amp; MOOCs in data science, computer science, business, and dozens of other topics. Aug 14, 2019 · Wealth inequality in America has grown tremendously from 1989 to 2016, to the point where the top 10% of families ranked by household wealth (with at least $1. Your codespace will open once ready. We want to check if a given string is balanced or not. The dystopian world of software engineering interviews. x − This is a numeric expression. The deposit and withdraw methods will deposit or withdraw the correct amount, respectively. That is, a small dish hangs from each end of a rod that is balanced in the middle. The distribution for our Smallest negative balance hackerrank. I love that there are so many nice supportive people on here. Given an array of numbers, find index of smallest array element (the pivot), for which the sums of all elements to the left and to the right are equal. jarednelsen. System design: One system design challenge, like design one well known functionality of Uber. Sample Input. HackerRank is the market-leading technical assessment and remote interview solution for hiring developers. May 01, 2021 · When processed with 5, it becomes 6 When processed with 3, it becomes 9 When processed with 2, it becomes 16 When processed with 4, it becomes 28 We always get a positive number. , We randomly select 100 data points out of 900 data points in majority class. In HackerRank, problems are more ad hoc (not classical algorithms) and thus, often require you to combine multiple algorithms or use them in interesting ways. How to Build Your Tech Talent Brand – Part 1. A. Failed to load latest commit information. Iterate this process. 1. Store the division result in some variable say note500 = amt / 500;. Take a small break, clear your mind from all the negative thoughts, and start freshly again. Factors of a number are those values that divide the original number evenly without leaving any remainder. * Given an integer array A of size N. Nowadays, more and more decisions are taken upon factual and objective data. Finding the smallest negative number and the smallest positive number in an array of transactions using . Q29) Which of the following command will help you to create the below table “AV” (Exactly Similar) based on “Table5”? AV Oct 16, 2020 · Hackerrank Ad Infinitum - Math Programming Contest June'14 Possible Path Solution. This book of practical exercises gives an introduction to coding . Each contest is described by two integers, and : is the amount of luck associated with a contest. We have made a number of small changes to reflect differences between the R and S programs, and expanded some of the material. or any of its affiliates, subsidiaries or related entities (“UPS”). Worker’s compensation is always accurate using the application, saving your company time, and reducing risks of negative audits at the end of the year. By and large, work-life balance can be supported with flexible hours — 10 am to 8 pm schedules are commonplace. So, we dug a bit deeper into what developers really want. For example, and:. Because of Toluna, I made more friends, increased my knowledge on current affairs and I have earned some pocket money for myself. In LeetCode, problems are straight forward (no flavor text) and usually test one specific algorithm. Using User-Defined Function. Include the necessary methods in order to achieve . IOStream library. min( x, y, z, . Floats with very big or very small absolute value can be written using a scientific notation. Input Format • the first line will start with CR or DR followed by a NON-NEGATIVE INTEGER separated by a space • the second line will be an integer representing the number of transactions to follow • all transactions will be of the same format as the first line Smallest negative balance hackerrank Home › HackerRank Questions › Balanced Brackets Hackerrank Solution. , CFA’S profile on LinkedIn, the world’s largest professional community. "Be confident," he says. Example #1: "I find that with the right company, it's pretty simple to balance life and work. Jul 03, 2019 · For a recent interview I did a hackerrank two-hour test about tic-tac-toe. In the same way, this blog talks about the multitude of . Store it in some variable say amt. luckBalance has the following parameter (s): k: the number of important contests Lena can lose. dev. In this post, we’re diving into what exactly a tech talent brand is and why it’s important. Your task is to find the smallest value of that makes the array balanced. * A element is special if removal of that element make the array balanced. If so then add it to the result array. ). For all values lower than 4, it would become negative for some value of the array. Here Maximum negative balance is the Output, if no person has negative balance then return no one is in debts. Python number method min() returns the smallest of its arguments: the value closest to negative infinity. 2 million in net worth) own 77% of the wealth “pie. then display the final balance as a credit or debit using the same notation. This is Part 1 of a 2-part series on How to Build Your Tech Talent Brand. Type: Company - Public (TWTR) Industry: Internet. Balanced Array HackerRank solution. Negative a and b are allowed, but gcd (a, b) is always nonnegative. To understand the basic functionality of the Stack, we will recommend you to visit the Stack Data Structure, where we have explained this concept in detail from scratch. Jun 15, 2018 · Rearrange[Segregate] positive and negative numbers with constant extra space. ExceptionHandling. But he has an estimated salary of only 11. Dec 14, 2020 · smallest negative balance 那道题应该不难,用一个hashmap和heap 就可以。 不过不知道为啥我只过了6/13个test cases. If the numbers are the same, then the number is a palindrome ,else it is not. java:19) The testException () method is throwing exceptions using the throw keyword. corner case也查了。 如果debt一样在造heap那个阶段也能按字母排序。 Dec 05, 2020 · Simliarly for B's and C's Balance. To help us understand the accuracy of our forecasts, we compare predicted sales to real sales of the time series, and we set forecasts to start at 2017–01–01 to the end of the data. If nothing happens, download Xcode and try again. Due to the countdown timer, I found it difficult to concentrate. LRU Cache. Fortunately, I had practiced on several other hackerrank problems in advance, so was very familiar with the UI and its quirks. Following example compares two strings by using str compareTo (string), str compareToIgnoreCase (String) and str compareTo (object string) of string class and returns the ascii difference of first odd characters of compared strings. One can cast float objects to int objects by discarding the fraction part using the int . reverse = ( reverse * 10) + lastDigit. The page is a good start for people to solve these problems as the time constraints are rather forgiving. Using Pointers. Replit is a simple yet powerful online IDE, Editor, Compiler, Interpreter, and REPL. Genshin is an open-world action role-playing game. Initially, her luck balance is 0. You can use the STAR method when answering behavioral interview questions like this. Metin has 10 jobs listed on their profile. Bhattacharya Jul 09, 2018 · It is not perfect, however, our model diagnostics suggests that the model residuals are near normally distributed. Choose some pivot element, p, and partition your unsorted array, , into three smaller arrays: left , right, and equal, where each element in left < p, each element in right > p, and each element in equal = p. The way different characters in the game mention . Search element in sorted and rotate array. End Date : 31/08/2021 23:59. 496·10 11, or 1. Learn and Practice on almost all coding interview questions asked historically and get referred to the best tech companies The coding challenges were all about Leetcode medium difficulty and completed with python3. Jun 21, 2021 · Employers ask this question to understand how you deal with difficulties. Paycor is an all in one HCM solution offering recruitment, onboarding, timekeeping, and payroll features for small to medium-sized businesses. Maximum sum such that no two elements are adjacent. g. Don't worry. ) For more information about how your Venmo balance works, visit this page. The hiring company rejected me out of hand with no discussion. ”. Solve company interview questions and improve your coding intellect HackerEarth is a global hub of 5M+ developers. August 18, 2020 10:25 PM. CodeChef - A Platform for Aspiring Programmers. Coding interview: two small coding exercises similar to HackerRank challenges. Some are in C++, Rust and GoLang. 2020-02-15 0:13 1027 811 www. d. Add Two Numbers II. exceptions. Balance validation. I needed to share my screen, The language and the IDE was chosen by me. CODING INTERVIEW 189 PROGRAMMING QUESTIONS & SOLUTIONS Author of Cracking the PM Interview and Cracking the Tech Career The coding challenges were all about Leetcode medium difficulty and completed with python3. 500000 0. It does imply that it just doesn't prove it. 0. As we all know, in cash bundles, several notes make up a stipulated amount of money necessary for the person concerned. softpython. Split Array into Fibonacci Sequence. . Sep 14, 2021 · Start Date : 15/07/2021 12:00. All disciplines, from engineering to social sciences, require to elaborate data and extract actionable information by analysing heterogenous sources. Maximum Length of Pair Chain. ) Parameters. The mass of one molecule of the water is 2. Oct 04, 2018 · Offer real work-life balance. Oct 29, 2016 · View Metin Akyol, Ph. experienced interpreter), small sets of sample pixels are selected for each class. Find the factors of number using prime factorisation with examples at BYJU’S. Using only NUnitLite 1's Assert. this derive the classes Curr-acct and Sav-acct to make them more specific to their requirements. Platform to practice programming problems. Encode and Decode TinyURL. It is a query language used to access data from relational databases and is widely used in data science. 1K VIEWS. contests: a 2D array of integers where each contains two integers that represent the luck balance and importance . Feb 05, 2017 · If count is negative, SCAN counts words from right to left in the character string. Pacific Atlantic Water Flow. Assume. 1) Allowing Poor Quality for Lower Costs. , its affiliates or divisions (including without limitation TForce Freight), which are not affiliated with United Parcel Service, Inc. She believes in "saving luck", and wants to check her theory. The opportunity to help the world connect, debate, learn, and solve problems is what draws us to careers at Twitter, and it’s what keeps us here. smallest negative balance hackerrank