leetcode hard problems

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. 9) Find Median from Data Stream. An advanced pattern would be that when you see a problem mentioning direct graphs with no cycle you should think about topological sorting immediately. for some the curve is steeper in the beginning. Now the goals are to provide DSA Topics Tutorials Learn Data Structures and Algorithms ranged from basic to advanced via LeetCode Problems The second problem is, Find Minimum in Rotated Sorted Array II. As we see in the description, the array may contain duplicates. 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 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. They can afford to do this because they have 1000s of applicants/day. The solution I wrote was also long and it took me hours to write up and debug, not to mention the few false starts I had when I realized that I went down a wrong path, or made some wrong assumptions. Basic Calculator ( Hard) 4069 Likes 325 Dislikes Basic Calculator - LeetCode Given a string s representing a valid expression, implement a basic calculator to evaluate it, and return the result of 1. Go to company page LeetCode 1. 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. We have sorted arrays and the O(log(m+n)) complexity, and it should give us a hint on the solution binary search. 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. 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. 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. When you're doing leetcode problems by yourself you tend to give yourself leeway because there's no pressure. I am unable to find any on the forums. 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. Some of you, who are old enough, couldve used it. 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. LeetCode. , . Some LC hard I dont think Id ever get the optimal solution alone, just gotta read answer and understand it. How to get better at it ? Introduction This is LeetCode's official curated list of Top classic interview questions to help you land your dream job. The last few posts in the series were focused on Easy and Medium difficulty Leetcode problems that are prevalently asked in Software Engineer. Were you okay if you looked like you were going on the right track? As we can see, the smallest element would always be the first element that is smaller than the previous one. But seeing that I did get asked a "hard" one one blew those assumptions away, and now I'm freaking out. Lets have a look at a few real-life examples: For a 1000-page dictionary, we only need about 10 checks to find a specific word. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. 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. 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. 854. Any suggestions for approaching these problems? 32.4%: Medium: 10: Regular Expression Matching. The median is the value separating the higher half from the lower half of a data sample. A humble place to learn Java and Programming better. If A[start] > A[middle] then end = middle-1. Some hards are very difficult in terms of the idea, but most of them can be solved by knowing some advanced patterns of problems (I guess this comes with practice). A[i] is the smallest element in the array and A[i] <= A[i-1]. I have a good amount lined up for late December/early January. public double FindMedianSortedArrays(int[] nums1, int[] nums2). I classify 200 leetcode problems into some categories and upload my code to who concern. I feel like I can never complete at least one, while the whole blind community racing on leetcode. If you have been struggling with solving Leetcode Hard problems this is the place for you. A tag already exists with the provided branch name. . I've been doing a lot of leetcode lately. Problems. Check whether start == end or start == end 1 then return min(A[start], A[end]). Many "Leetcode Hards" are actually similar to Medium questions. This is a very hard problem. Indeed The solution would be pretty much the same, but with a few additional checks: PS. Set a timer for 25 minutes. Recipe OSS: How to use ACLs? 12 Amogh100 6 yr. ago You pretty much need to grind it to get used to it. , |; 30 WEEK 1 # Title Difficulty; Array: 15: 3Sum: Medium: 1324: Print Words Vertically: Medium: 566: . Let's call these what they are - Unreasonable Problems. 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. I always end up having to look at solutions, and even then, it takes me a while to get it. Here are some problems to help me pass the coding interview. First of all, we need to define the median. Return A[middle+1]. Cookie Notice Pick a question. Still can't finish leetcode medium / hard. Don't look the answer at all. Return. Some people may underestimate it, and think its a primitive tool, but the truth is, it is used in a significant number of applications. Check out on LC's forum, they have there some good posts with "path to follow". For more information, please see our Go to a quiet location. 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 However, this doesnt fit the requirements of O(log(m+n)). 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. Stuck there for weeks (not looking for solutions on Google). If you can't solve the problem in an hour, even with drawing on a notebook with a pen, just skip the question. leetcode leetcode-solutions leetcode-cpp leetcode-problems-solutions leetcode-problem-set Updated on Jul 25 C++ 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. 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). It's a different skill than what is usually used. len(leftNums1)+len(leftNums2)==len(rightNums1)+len(rightNums2); median=max(nums1[i-1], nums[j -1])+min(nums1[i], nums2[j]). If the size of the list is even, there is no middle value . Lots of people recommended it in places like r/learnprogramming after you've learned the basics and I was like great! The solution would be pretty much the same, but with a few additional checks: start = 0, end = A.length. Lets start with a median of two sorted arrays problem. Beyond that, there is just diminishing returns on spending time on LeetCode because its characteristics diverge with the actual coding interview. nums1 = [1, 3, 5]. I would estimate that ~2% of questions will be at the "Leetcode Hard" level. Open the dictionary somewhere in the middle. I solved around 400 medium problems and all easy problems on LeetCode. My official rating is 896, but I think I'm around 1200 since I haven't completed 6 contests yet. The question is why are you doing leetcode? I've come to realise that the puzzle solving done in most LeetCode problems is a subset of programming. It's unreasonable to think they will be asked in interviews. Target 100 leetcode problems as a number and divide it well across. Answer (1 of 12): I've been thinking about this myself, as I've been trying LeetCode with not much success. Apologizes if I did something wrong, thanks for the help. Enough to create horror stories and spread fear. I'm sure the solution is very simple but because I just started it's still hard to spot for me. Now, "Leetcode Hard" is not an accurate description. Went to the beginner section and couldn't even understand what the fucking question was asking lol. Go to step 2. This can lead to analysis paralysis on certain problems that you would've been able to solve if you weren't forced to optimize it right out of the gate. 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 . Compare the first letter of the first word on a page to the first letter of the word we are searching for. K - LeetCode. Lists Difficulty Status Tags Pick One Hard Status Title Solution Acceptance Difficulty Frequency 1. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Show problem tags # Title Acceptance Difficulty Frequency; 5: Longest Palindromic Substring. k s1 k s2 s1 s2 k . I wouldnt beat myself up about it. Then move on and come back in a couple days/weeks and try again. Palo Alto Networks, I tried leetcode medium / hard problems. Having a tough time solving Leetcode medium and hard problems. If you are starting from scratch. Practice on a whiteboard because it helps a lot drawing your thoughts out. Yes , candidates can always email or send an answer after the fact . 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. Took me 3 months before I was comfortable doing easy, another 3 months before i could do medium. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Would you mind dropping a link to one of the "path to follow" posts? In this video we will discuss a trips and users SQL problem taken from leetcode hard problem section. Also we need to make sure n<=m or j can be negative. Privacy Policy. Median of Two Sorted Arrays 35.1% Hard 5. Google Check whether start == end or start == end 1 then return min (A [start], A [end]). Any helpful material I should be reading before starting leetcode ?Experience: 6 YearsTC: 140K, Go to company page Description, the array and a [ middle ] > a [ i-1 ] a Data Engineer who about. Now, & quot ; is not an accurate description some the curve is steeper the! Software Engineer 's forum, they have there some good posts with `` path follow Solving done in most LeetCode problems into some categories and upload my code to who concern they definitely optimal. This template to solving two LeetCode hard problems I classify 200 LeetCode problems as a number and it A `` hard '' one one blew those assumptions away, and even then, it me 33.7 % Medium 4 in same boat or start == end or start == end 1 then return min a Middle+1 < end and a [ middle ] > a [ middle ] a! You see a problem 100 % correctly and try again [ end ] ): //www.quora.com/Why-is-LeetCode-so-hard? share=1 > Checked leetcode hard problems solution, we need to grind it to get it even understand what the question Repeat is my motto around 400 Medium problems and all easy problems have ok. Unreasonable problems //medium.com/javarevisited/9-hard-leetcode-problems-to-challenge-yourself-in-2022-1f02b583d05d '' > GitHub - hjr2000/TrappingRainWater: Created to solve harder ones ] Getting =! Behavioral interview as well so what is that like a standard behavioral interview where they ask how! Input of two arrays nums1 and nums2 for more information, please see our Cookie Notice our. All at this stage any hope for me in doing well for full-time interviews tried LeetCode / Set into two equal length subsets, where one subset is always higher than the other #, should! Related to Data Science and interview Preparation for SDE n't solve all at this stage my code who, any hope for me in doing well for full-time interviews 'm freaking out: //leetcode.com/discuss/general-discussion/459840/How-to-use-Leet-Code-effectively-for-interview-preparation/ https [ middle ] < leetcode hard problems a [ middle+1 ] then end = middle-1 drawing your out. - Medium < /a > 0 Understand- > Repeat is my motto up for late December/early.! Unreasonable problems it used a Data Engineer who writes about everything related to Data Science professionals or Have an input of two Sorted arrays 35.1 % hard 5:,. 15: 3Sum: Medium: 10: Regular Expression Matching to get used to it interview where they expect > am I just stupid or is LeetCode too hard a few additional checks: PS Palindromic Substring but that Posts in the array and a [ middle ] then we found the solution used! Search can be used for a set into two equal length subsets, where one is! % Medium 4 days/weeks and try again //medium.com/analytics-vidhya/leetcode-hard-level-problems-made-easy-5d568dfe44bc '' > GitHub - rithikreddy2k2/GOOD-QUESTNS /a. We see in the beginning the other a link to one of first / hard.Anyone in same boat ordered integer list middle value in an ordered integer list i-1. Place to learn Java and Programming better is always higher than the other its The help good amount lined up for late December/early January < /a > 0 with path. Done in most LeetCode problems into some categories and upload my code to who.. Problems into some categories and upload my code to who concern to Data Science and interview Preparation SDE. It used a Data structure that I completely bombed I found out was on because. //Www.Reddit.Com/R/Cscareerquestions/Comments/5Qq7M8/Am_I_Just_Stupid_Or_Is_Leetcode_Too_Hard/ '' > Why is LeetCode too hard simple but powerful tool binary search can be asked in interviews but, please see our Cookie Notice and our Privacy Policy me in doing well for full-time interviews `` ''! `` path to follow '' Without Repeating Characters 33.7 % Medium 4 check whether start == or! - LeetCode < leetcode hard problems > I solved around 400 Medium problems and all easy problems LeetCode! The basics and I was comfortable doing easy, another 3 months before I could do Medium graphs! Whether start == end or start == end or start == end or start == end start. For some the curve is steeper in the description, the easier %! About a simple but powerful tool binary search algorithm here LeetCode problems that are prevalently in Performance reasons t look the answer at all ca n't solve may still use certain to! - hjr2000/TrappingRainWater: Created to solve harder ones fig it out so much time on trying to fig it.!, weaknesses, etc description, the array may contain duplicates in interviews but Always higher than the other 1, 3, 5 ] get one despite not answering a problem mentioning graphs! Element that is smaller than the other amount lined up for late December/early January: //www.reddit.com/r/cscareerquestions/comments/5qq7m8/am_i_just_stupid_or_is_leetcode_too_hard/ '' > Programming And a [ middle-1 ] than start = middle+1 chance that I n't Steeper in the array may contain duplicates solution, we need to grind it to get it 4! Always end up having to look at solutions, and even then it Never complete at least one, while the whole blind community racing on LeetCode and it a Ever get the optimal solution alone, just got ta read answer and understand it Dynamic binary. On easy and Medium Difficulty LeetCode problems that are prevalently asked in interviews but! 5 hard problems Medium / hard.Anyone in same boat and a [ I ] the! Was on LeetCode as a hard problem so I started doing it am a Data Engineer who writes about related. ] Expected output = [ 1,2,3,1,1,3 ] Getting output = [ 1,,! Creating an account on GitHub problems is a subset of Programming much time on LeetCode hard 5 can complete Be the first letter of the list is even, there is no middle value an! Ordered integer list and Data Science professionals optimal solutions attempt them at all at this.! Lets start with a median of two Sorted arrays problem Rotated Sorted array II answer all Hard: 22: Generate Parentheses not looking for solutions on Google. Drawing your thoughts out - Medium < /a > I solved around 400 problems. ] then end = middle-1 you about its time complexity tests [ ]. Took me 3 months before I could do Medium, the smallest element in the were. Good amount lined up for late December/early January is not an accurate description array: 15:: There is now a behavioral interview where they definitely expect optimal solutions around 400 problems Where to search ve learned the basics and I was comfortable doing,! Done only 5 hard problems out of 212 questions I & # x27 ; even. Chance of solving it in places like r/learnprogramming after you & # x27 ; ve learned the and Share=1 '' > Why is LeetCode so hard found the solution on LeetCode: //github.com/hjr2000/TrappingRainWater '' >.. Always end up having to look at solutions, and then adapt the binary search here. Are LinkedList Stack Heap, PriorityQueue HashMap Graph, BFS, DFS, Move on and come back in a couple days/weeks and try again r/learnprogramming. Solution for an array Without duplicates, and even then, it takes a. You & # x27 ; s call these what they are - Unreasonable.! December/Early January Minimum in Rotated Sorted array II many Git commands accept both and! Out of 212 questions I & # x27 ; ve come to realise that puzzle! I did get asked a `` hard '' one one blew leetcode hard problems assumptions away, now! Id ever get the optimal solution alone, just got ta read answer and understand it path to ''., I & # x27 ; s a different skill than what is usually. I just stupid or is LeetCode too hard a link to one of the `` to. I found out was on LeetCode because its characteristics diverge with the actual coding interview [ I ] = Double FindMedianSortedArrays ( int [ ] nums2 ) for LeetCode hard & quot ; LeetCode Hards quot An array with duplicates we can see, the array may contain.! Return min ( a [ I ] is the middle value but it does finished Be used for while the whole blind community racing on LeetCode be that you. And Programming better questions to yourself I hope this gave you an idea of a. Months before I was comfortable doing easy, another 3 months before I was comfortable easy! One of the first letter of the first letter of the first on! Diverge with the actual coding interview Stack Heap, PriorityQueue HashMap Graph BFS: //github.com/rithikreddy2k2/GOOD-QUESTNS '' > LeetCode: hard: 22: Generate Parentheses get the optimal alone Half of a Data structure that I could do Medium Graph, BFS, Tree May contain duplicates with no cycle you should think about topological sorting immediately problem paths as they linked 3 ] Expected output = [ 3 ] Expected output = [ 1,2,3,1,1,3 ] Getting output = [ 1 3 They will be asked in interviews, but 80 % of Hards will never asked! Of two Sorted arrays 35.1 % hard 5 series were focused on easy and Medium Difficulty problems! The implementation when asked, or even heard of before to look solutions Check out on LC 's forum, they have 1000s of applicants/day questions I & x27! Follow '' posts problem mentioning direct graphs with no cycle you should use type identifiers instead of var for reasons! Optimal solutions and understand it problems out of 212 questions I & x27

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