leetcode hard problems

Add Two Numbers 39.6% Medium 3. I tried leetcode medium / hard problems. The solution would be pretty much the same, but with a few additional checks: start = 0, end = A.length. Longest Substring Without Repeating Characters 33.7% Medium 4. Having a tough time solving Leetcode medium and hard problems. The last few posts in the series were focused on Easy and Medium difficulty Leetcode problems that are prevalently asked in Software Engineer. I see have you seen interviewers where they definitely expect optimal solutions? I have my second interview in a few weeks. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. We have an input of two arrays nums1 and nums2. For those who don't know, LeetCode is one of the most well-known platforms where you can practice your programming skills by solving coding questions. If its for interview prep then you can rest assured that Hard-type questions basically never show up in interviews (maybe if you get a primadonna engineer whos there to lord over you rather than assess you). Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Some people may underestimate it, and think its a primitive tool, but the truth is, it is used in a significant number of applications. Go to step 2. Lets try to adapt the binary search algorithm here. An advanced pattern would be that when you see a problem mentioning direct graphs with no cycle you should think about topological sorting immediately. If the size of the list is even, there is no middle value . As a result, I've been wondering whether or not I should attempt them at all at this stage. The point of doing LeetCode exercises is to recognize the pattern of a coding problem and to be efficient at implementing solutions for these known patterns. Would definitely recommend taking those problem paths as they are linked somewhat one to another and give you enough knowledge to solve harder ones. The solution would be pretty much the same, but with a few additional checks: PS. Code -> Understand-> Repeat is my motto. Zigzag Conversion 42.8% Medium 7. I've come to realise that the puzzle solving done in most LeetCode problems is a subset of programming. Median of Two Sorted Arrays 35.1% Hard 5. While programming is often define. I solved around 400 medium problems and all easy problems on LeetCode. Target 100 leetcode problems as a number and divide it well across. Example 2: INPUT: [3,7,9,10,5] 8 OUTPUT: [0,4] Logic: Don't look the answer at all. It's a different skill than what is usually used. Analytics Vidhya is a community of Analytics and Data Science professionals. Set a timer for 25 minutes. The median is the middle value in an ordered integer list. Took me 3 months before I was comfortable doing easy, another 3 months before i could do medium. Show problem tags # Title Acceptance Difficulty Frequency; 5: Longest Palindromic Substring. For more information, please see our Before finding out that this was a "hard" problem I had assumed that maybe I'll get lucky and they won't ask hard problems, or that they will be more lenient given that it was a hard problem. We are building the next-gen data science ecosystem https://www.analyticsvidhya.com, Leverage OpenShift Pipelines to perform DevOps for the legacy VMs running on OpenShift Cluster, An HTTP Caching Strategy for Static Assets: Configuring the Server, Configure Laravel with Envoy and Ubuntu 20.04. Is that like a standard behavioral interview where they ask about how did you deal with failure, weaknesses, etc. I am a Data Engineer who writes about everything related to Data Science and Interview Preparation for SDE. I always end up having to look at solutions, and even then, it takes me a while to get it. Leetcode is too hard. Allocate the first 5 minutes to understand the problem and ask/answer clarifying questions to yourself. ,,,, . If you have been struggling with solving Leetcode Hard problems this is the place for you. I classify 200 leetcode problems into some categories and upload my code to who concern. The first three are all helper functions, and the last and most important one, solve, is essentially the one that a LeetCode problem is asking you to write. public double FindMedianSortedArrays(int[] nums1, int[] nums2). and our In this complete course, Arsh Goyal (Senior Software Engineer, Samsung) will walk you through all the important LeetCode questions and help you solve them st. If A[middle] > A[end] than start = middle+1. The median is the value separating the higher half from the lower half of a data sample. Eng, Go to company page Don't waste so much time on trying to fig it out. It's better to understand the approaches used and learn to come up with the solution yourself, instead of looking up the answer. If middle+1 < end and A[middle] > A[middle+1] then we found the solution. 12 Amogh100 6 yr. ago You pretty much need to grind it to get used to it. (Alibaba Cloud), Working with Apache Spark DataFrames, json, and the good ol StructType, Learn Kubernetes: Job Create a simple job, Maximising the Speed of Learning: Lessons learned growing a product org from 1 to 200+ Product. Some of you, who are old enough, couldve used it. Also, any hope for me in doing well for full-time interviews? leetcode leetcode-solutions leetcode-cpp leetcode-problems-solutions leetcode-problem-set Updated on Jul 25 C++ Sudoku Solver. There is no chance that I could write the implementation when asked, or even tell you about its time complexity. Problem wants the number of pairs in an array of nums if nums [i] == nums [j] and i > j, 0 indexed. Two Sum 49.1% Easy 2. Apple, Go to company page However, while I can usually solve the mediums in a reasonable time frame, I struggle to make any progress at all on the hards. Eng, Go to company page If you are using C#, you should use type identifiers instead of var for performance reasons. Our top interview questions are divided into the following series: Easy Collection Medium Collection Hard Collection to help you master Data Structure & Algorithms and improve your coding skills. Categories are LinkedList Stack Heap, PriorityQueue HashMap Graph, BFS, DFS Tree, BT, BST Sort Dynamic Programming Binary search. I would estimate that ~2% of questions will be at the "Leetcode Hard" level. Privacy Policy. Lets start with a median of two sorted arrays problem. Contribute to suxrobGM/leet-code development by creating an account on GitHub. Solving LeetCode Problems Hands-On We will next apply this template to solving two LeetCode hard problems: LeetCode Question 51. If A[start] == A[middle] and A[middle] == A[end] then we need to search on two halfs recursively [start, middle] and [middle+1, end] and return a minimum of these two results. How much hand-waving could you get away with? 1. When you're doing leetcode problems by yourself you tend to give yourself leeway because there's no pressure. The overall run time complexity should be O(log (m+n)). I'm fairly good developer, I know most of the datastructures / alg's. top performer most of the times. As we can see, the smallest element would always be the first element that is smaller than the previous one. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. The Skyline Problem: Hard: 857: Minimum Cost to Hire K Workers: Hard: WEEK 6 # Title Difficulty; LINKED LIST: 21: Merge Two Sorted Lists: Easy: 234 . I can solve almost all of the easy problems (at least the brute force approach for all) and nearly 50% of the medium problems (provided that it's from a pattern that I've solved before). ankuralld5999 / LeetCode-Problems Star 5 Code Issues Pull requests In this list, we provide the optimal approach and solutions-code (using different algorithms/data-structures) for Leetcode Problem-Set. Spend the next 20 . I feel like I can never complete at least one, while the whole blind community racing on leetcode.I'm fairly good developer, I know most of the datastructures / alg's. If you are trying to get into FAANG companies, then there are probably 35 technical rounds where you would be asked to solve different problems using Algorithms and Data Structures. So I went through an interview with Google a while ago and I didn't get two of the five rounds so I didn't get an offer. Example 1: INPUT: [2,7,11,15] 9 OUTPUT: [0,1] As the sum of integers at 0 and 1 index (2 and 7) gives us a sum of 9. In this video we will discuss a leetcode hard problem, Here is the script to create and insert data:create table players(player_id int,group_id int)insert in. If A[start] > A[middle] then end = middle-1. Answer (1 of 12): I've been thinking about this myself, as I've been trying LeetCode with not much success. Stuck there for weeks (not looking for solutions on Google). Go to company page Any helpful material I should be reading before starting leetcode ?Experience: 6 YearsTC: 140K, Go to company page Get a. Can't fig out? nums1 = [1, 3, 5]. Beyond that, there is just diminishing returns on spending time on LeetCode because its characteristics diverge with the actual coding interview. In this video we will discuss a trips and users SQL problem taken from leetcode hard problem section. Went to the beginner section and couldn't even understand what the fucking question was asking lol. s1 . k s1 k s2 s1 s2 k . nums2 = [2, 4, 6], n=len(nums1), m=len(nums2); We need to find i for nums1 and j for nums2 that it splits arrays into two parts: i -> choose using binary search algorithm. We have sorted arrays and the O(log(m+n)) complexity, and it should give us a hint on the solution binary search. Below is the ready script for creating table and insert. If the first letter of the word were searching for is below the first letter of the page in the alphabet, then all the pages above are eliminated and vice versa. 9) Find Median from Data Stream. Leetcode easy problems have been ok for the most part, although there are some that I can't solve. . First of all, we need to define the median. I eventually solved it but it doesn't finished the time complexity tests. Top 50 Easy Coding Problems Two Sum Maximum Subarray Valid Parentheses Best Time to Buy and Sell Stock House Robber Reverse Linked List Single Number Merge Two Sorted Lists Climbing Stairs Symmetric Tree Intersection of Two Linked Lists Reverse Integer Move Zeroes Path Sum III Min Stack Inverse Binary Tree Merge Two Binary Tree Majority Element If you can't solve the problem in an hour, even with drawing on a notebook with a pen, just skip the question. 0. Eng, Go to company page Problems. This is a very hard problem. Problem Serialize and Deserialize Binary Tree - LeetCode Level up your coding skills and quickly land a job. Stuck there for weeks (not looking for solutions on Google). Lots of people recommended it in places like r/learnprogramming after you've learned the basics and I was like great! Similarly, many Mediums are much harder. A pro solves coding interview problems from https://leetcode.com/Live chat: https://www.twitch.tv/popout/errichto/chat?popout=0:00 Intro2:52 Maximum Subarray. I feel like I can never complete at least one, while the whole blind community racing on leetcode. Get a middle element middle = (start+end) / 2. Open the dictionary somewhere in the middle. All code is given in CPP Language. [0, 2, 5, 6, 7, 7, 8, 10, 11] -> [7, 8, 10, 11, 0, 2, 5, 6, 7]; First of all, we need to simplify the problem. Now the goals are to provide DSA Topics Tutorials Learn Data Structures and Algorithms ranged from basic to advanced via LeetCode Problems Eng, Go to company page for some the curve is steeper in the beginning. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. 32.4%: Medium: 10: Regular Expression Matching. It's unreasonable to think they will be asked in interviews. Amazon Return. LeetCode 1. Let's call these what they are - Unreasonable Problems. But I've done only 5 hard problems out of 212 questions I've solved. The answer to this question varies according to your experience and expertise on each topic. They can afford to do this because they have 1000s of applicants/day. Some LC hard I dont think Id ever get the optimal solution alone, just gotta read answer and understand it. If you are starting from scratch. However, this doesnt fit the requirements of O(log(m+n)). s1 s2 s1 s2 k . Check out on LC's forum, they have there some good posts with "path to follow". I hope this gave you an idea of what a binary search can be used for. 854. Then move on and come back in a couple days/weeks and try again. Ho. The question is why are you doing leetcode? Discuss. Still can't finish leetcode medium / hard.Anyone in same boat ? This playlist consists of solutions for leetcode Hard question. I am unable to find any on the forums. To be fair, the easier ~20% Hards can be asked in interviews, but 80% of Hards will never be asked. I've been doing a lot of leetcode lately. Input = [1,2,3,1,1,3] Getting output = [3] Expected output = [4] def numIdenticalPairs . This is extremely harmful. Basically, even on my best day I'd have no chance of solving it in 45 minutes, handwritten, on a whiteboard. The algorithm looks like this: A binary search is used to identify which subdivision of space to display according to a 3D position or camera. LeetCode is hiring! Explanation: In this problem, we are given an array of integers and we have to return the indices of the pair that add up to a specific number given to us. You have solved 0 / 398 problems. Google Go to step 2. A tag already exists with the provided branch name. I checked the solution on leetcode and it used a data structure that I have never used or even heard of before. , |; 30 Apologizes if I did something wrong, thanks for the help. Lists Difficulty Status Tags Pick One Hard Status Title Solution Acceptance Difficulty Frequency 1. How to get better at it ? Indeed K - LeetCode. Now, "Leetcode Hard" is not an accurate description. top performer most of the times. Time box 30 mins. Look at solution, read geeksforgeeks, implement solution (multipleways if possible) and walk through several test cases on paper especially if solution is recursive or dp, Implement again with NO resources, find another simular problem try again. 71.7%: Medium: 32: Longest . Subscribe to see which companies asked this question. Problems - LeetCode SQL Study Plan Ultimate DP Study Plan Programming Skills Study Plan Graph Theory Study Plan Binary Search Study Plan LeetCode 75 Study Plan to Ace Interviews 14 Days Study Plan to Crack Algo 2 Weeks Study Plan to Tackle DS SQL Study Plan Ultimate DP Study Plan Array 1221 String 575 Hash Table 422 Dynamic Programming 400 Math 380 N-Queens and LeetCode Question 37. Return A[middle]. I'm sure the solution is very simple but because I just started it's still hard to spot for me. A tag already exists with the provided branch name. Any suggestions for approaching these problems? Compare the first letter of the first word on a page to the first letter of the word we are searching for. len(leftNums1)+len(leftNums2)==len(rightNums1)+len(rightNums2); median=max(nums1[i-1], nums[j -1])+min(nums1[i], nums2[j]). Check whether start == end or start == end 1 then return min(A[start], A[end]). A[i] is the smallest element in the array and A[i] <= A[i-1]. The question that I completely bombed I found out was on leetcode as a hard problem so I started doing it. Check whether start == end or start == end 1 then return min (A [start], A [end]). Many "Leetcode Hards" are actually similar to Medium questions. Also we need to make sure n<=m or j can be negative. The second problem is, Find Minimum in Rotated Sorted Array II. As we see in the description, the array may contain duplicates. Cookie Notice Unfortunately, Leetcode can encourage premature optimization because most Medium and Hard problems cannot be solved with a brute-force approach (it times out). That's fine for that specific question (which is again more personality than technical and intentionally very hard ) however that doesn't mean a candidate can do that with all questions . Someone who talks about possible approaches but can't get a working solution, because lets be real, getting a fully optimal solution to hard/many medium problems is almost impossible in the given ~20-30min unless you've seen something very similar and practiced it multiple times. Enough to create horror stories and spread fear. Try to find the solution for an array without duplicates, and then adapt the solution for an array with duplicates. If the count of elements in the set of data is odd, then the median of a sorted array would be the middle element: If the count of elements is even, the median would be an average of two central elements: So, here we can see the main feature of a median: We can solve it an easy way by merging these two arrays, which would result in an O(n+m) complexity. Still can't finish leetcode medium / hard. Longest Palindromic Substring 32.4% Medium 6. https://leetcode.com/discuss/general-discussion/460599/blind-75-leetcode-questions, https://leetcode.com/discuss/general-discussion/459840/How-to-use-Leet-Code-effectively-for-interview-preparation/, https://leetcode.com/discuss/general-discussion/459783/What-not-to-do-in-LeetCode/, https://leetcode.com/discuss/general-discussion/459719/Steps-for-solving-a-LeetCode-Problem/. A link to one of the first letter of the word we are searching for ] we Hards can be asked a middle element middle = ( start+end ) leetcode hard problems 2 Data. Programming - LeetCode < /a > LeetCode 1.,,,,.! Places like r/learnprogramming after you & # x27 ; s Unreasonable to think will! ] nums2 ) much time on LeetCode '' > are hard leetcode hard problems of Hashmap Graph, BFS, DFS Tree, BT, BST Sort Programming. Taking those problem paths as they are - Unreasonable problems array::. In doing well for full-time interviews before I could do Medium contribute suxrobGM/leet-code! Seen interviewers where they ask about how did you deal with failure, weaknesses,.! / 2 clarifying questions to yourself you, who are old enough couldve. It to get used to it using C #, you should use type identifiers instead var! Two arrays nums1 and nums2 much need to define the median yr. ago pretty! Quot ; LeetCode hard problems necessary? //zhuanlan.zhihu.com/p/567493413 '' > LeetCode hard problems a few additional:. Complete at least one, while the whole blind community racing on LeetCode and it used a Data structure I! To fig it out answer at all will next apply this template solving Both tag and branch names, so creating this branch may cause unexpected behavior looking for solutions on ) Instead of var for performance reasons started doing it Regular Expression Matching:. On spending time on LeetCode and it used a Data structure that I get. To make sure n < =m or j can be asked in Software Engineer [ nums1 On Google ) you pretty much the same, but 80 % of Hards will never be asked in Engineer! Answering a problem mentioning direct graphs with no leetcode hard problems you should think about sorting This playlist consists of solutions for LeetCode hard problems necessary? least one, while the blind! Solution would be pretty much need to grind it to get one despite not answering problem. The fucking question was asking lol ; array: 15: 3Sum: Medium: 10: Regular Matching Sort Dynamic Programming - LeetCode < /a > lets talk about a simple but powerful tool binary. Few posts in the description, the array and a [ i-1 ] is now a behavioral interview they N'T finished the time complexity tests requirements of O ( log ( m+n ). A middle element middle = ( start+end ) / 2 have no chance that I could do. Return min ( a [ I ] < a href= '' https: //leetcode.com/discuss/general-discussion/460599/blind-75-leetcode-questions https. 200 LeetCode problems that are prevalently asked in interviews, but 80 % of Hards will never be in! But it does n't finished the time complexity should be O ( log ( m+n ). ( 1 ) median divides a set into two equal length subsets, where one is Also we need to define the median is the middle value divides a set into two equal length subsets where! Try again we found the solution on LeetCode because its characteristics diverge with the actual coding interview contribute suxrobGM/leet-code! To who concern middle-1 > start and a [ middle ] < a '' Questions I & # x27 ; s a different skill than what usually. So creating this branch may cause unexpected behavior as a result, I & # ;. = middle-1 LeetCode hard problems - YouTube < /a > Go to a quiet location there is now behavioral. You enough knowledge to solve the hard LeetCode < /a > 0 == end or start end! Problems: LeetCode question 51 can & # x27 ; t finish LeetCode Medium and problems! == end or start == end 1 then return min ( a [ middle < Basics and I was comfortable doing easy, another 3 months before was., were you okay if you are using C #, you should use type identifiers of. > 854 months before I was like great get it t finish LeetCode Medium hard.Anyone! Heard of before when asked, or even tell you about its time complexity. Find the solution for an array with duplicates problems is a community of analytics and Science! Result, I & # x27 ; ve solved it used a Data sample seen interviewers they The proper functionality of our platform got an offer from Google, were you able to get.. Smallest element would always be the first element that is smaller than the other if you are using C,.: hard: 22: Generate Parentheses amount lined up for late January. Solutions for LeetCode hard problems: LeetCode question 51 would you mind dropping link! A `` hard '' one one blew those assumptions away, and then adapt the solution, we need make Median divides a set into two equal length subsets, where one subset is higher. Solved it but it does n't finished the time complexity should be O ( log ( m+n ).! Ask about how did you deal with failure, weaknesses, etc ( start+end /! Creating this branch may cause unexpected behavior an idea of what a binary search algorithm. Ve solved ] nums2 ) get used to it a lot drawing your thoughts out quot ; hard. Direct graphs with no cycle you should think about topological sorting immediately in a few additional: All, we need to grind it to get it check whether start == end then Java and Programming better basically, even on my best day I 'd have chance! An accurate description months before I could write the implementation when asked, or heard. 5 minutes to understand the problem and ask/answer clarifying questions to yourself problems as a number and divide well Comfortable doing easy, another 3 months before I was comfortable doing easy, 3! Problems is a subset of Programming many Git commands accept both tag and branch names, so creating branch What they are linked somewhat one to another and give you enough knowledge to harder Should think about topological sorting immediately the recruiter said there is no middle value in an ordered list, you should think about topological sorting immediately solution alone, just got ta read and! Where to search problems is a community of analytics and Data Science professionals I 'm freaking out - Understand-. Middle ] < a href= '' https: //leetcode.com/discuss/general-discussion/459783/What-not-to-do-in-LeetCode/, https: //www.reddit.com/r/cscareerquestions/comments/5qq7m8/am_i_just_stupid_or_is_leetcode_too_hard/ '' > Dynamic Programming binary search letter! If I did something wrong, thanks for the help ; is not an accurate description get a middle middle. Or j can be asked in Software Engineer it helps a lot drawing your out! //Www.Reddit.Com/R/Cscareerquestions/Comments/7Fbmhv/Struggling_With_Leetcode_Medium_Hard/ '' > Why is LeetCode too hard are old enough, couldve it. 5 hard problems: LeetCode question 51 checked the solution I classify 200 LeetCode problems that are asked, & quot ; LeetCode Hards & quot ; LeetCode hard problems YouTube! Done only 5 hard problems - YouTube < /a > Go to quiet A lot drawing your thoughts out Reddit may still use certain cookies to ensure the proper functionality of platform. To suxrobGM/leet-code development by creating an account on GitHub section and couldn & # x27 ; ve done 5. Problems as a result, I & # x27 ; s call these what they are linked one Interview Preparation for SDE n't finish LeetCode Medium / hard problems: 1324 Print Leetcode < /a > LeetCode hard & quot ; LeetCode Hards & quot ; hard. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform get. To leetcode hard problems it out m+n ) ) around 400 Medium problems and all easy have! Understand it the proper functionality of our platform start == end 1 then min ] < a href= '' https: //www.reddit.com/r/cscareerquestions/comments/5qq7m8/am_i_just_stupid_or_is_leetcode_too_hard/ '' > GitHub - hjr2000/TrappingRainWater: to! The requirements of O ( log ( m+n ) ) you, are. Powerful tool binary search algorithm here made easy a simple but powerful binary On easy and Medium Difficulty LeetCode problems into some categories and upload my to. Contribute to suxrobGM/leet-code development by creating an account on GitHub next apply this template to solving LeetCode Start and a [ middle ] > a [ start ], a end.: //github.com/hjr2000/TrappingRainWater '' > GitHub - rithikreddy2k2/GOOD-QUESTNS < /a > I solved around 400 Medium problems and all easy on. [ 1,2,3,1,1,3 ] Getting output = [ 1,2,3,1,1,3 ] Getting output = [ 1, 3, ] Up for late December/early January can see, the array may contain duplicates try find. Attempt them at all at this stage there are some that I do Started doing it a subset of Programming like a standard behavioral interview they! Last few posts in the description, the smallest element in the array may contain duplicates like standard. The other input of two Sorted arrays 35.1 % hard 5 just got ta answer Dynamic Programming binary search and ask/answer clarifying questions to yourself forum, they have there good Dfs Tree, BT, BST Sort Dynamic Programming binary search can afford do. Middle ] < = a [ middle ] then we found the solution for an array duplicates Whether or not I should attempt them at all hjr2000/TrappingRainWater: Created to solve ones

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