ABAbhishek Batrainabhishek-codes.hashnode.dev·3d ago · 9 min readHow I Built Verdict: My Own Online Judge PlatformIf you've ever solved a problem on LeetCode or Codeforces, you've used an "online judge" — a system that takes your code, runs it against test cases, and tells you instantly whether it's correct. I al10
SPSneha Poojaryindsamadesimple.hashnode.dev·3d ago · 7 min readTwo Pointers Explained: The Proof Nobody Shows YouEvery algorithm blog on the internet tells you how to move two pointers. Virtually none of them prove why you're allowed to move them, or why the exact same structural logic manages unacknowledged byt00
FOFortunatus Olorunsolainfortunatus-notes.hashnode.dev·Aug 9 · 10 min readSolving 1920: how to store 2 numbers in 1Check out the problem here. The first and obvious solution to this problem is even in the question: ans[i] = nums[nums[i]]. You loop over the nums array and in each iteration, you just put whatever nu00
TLThync Labsinthynclabs.hashnode.dev·Jul 30 · 7 min readWhy You Can Solve LeetCode but Still Fail the Coding InterviewYou've solved 300 problems. Maybe 500. You recognize a sliding-window question on sight, you know your DP patterns cold, and your submission streak is a wall of green. Then you walk into the real inte00
TVThrishali Vittalinmycodingchallenge.hashnode.dev·Jul 28 · 5 min readDay 7 – Solving Longest Common Prefix in PythonOne of the common string problems asked in coding interviews is Longest Common Prefix. At first glance, the problem seems straightforward, but it teaches us how to compare multiple strings efficiently00
TVThrishali Vittalinmycodingchallenge.hashnode.dev·Jul 27 · 6 min readLeetCode Day 6: Valid Parentheses – Python Solution The Valid Parentheses problem is one of the most popular beginner-friendly stack problems on LeetCode. It teaches you how to process nested structures efficiently and introduces the concept of Last In00
TVThrishali Vittalinmycodingchallenge.hashnode.dev·Jul 24 · 5 min readLeetcode Day 5 – Solving Valid Parentheses Using a Stack in PythonWhen I first looked at the Valid Parentheses problem, it seemed simple because it only involved brackets. But after trying a few test cases, I realized that the challenge is keeping track of the order00
RKRohit Kumharintech-rohit.hashnode.dev·Jul 23 · 38 min readMaster the Two Pointers Pattern in Python (Part 1): Two Sum, Squares of Sorted Array & Remove DuplicatesIntroduction If you've spent time solving coding interview problems, you've probably noticed a common pattern: many array problems seem to invite a nested loop solution. While that approach works, it 10
TVThrishali Vittalinmycodingchallenge.hashnode.dev·Jul 23 · 4 min readLeetCode Day 4: Two Sum (Brute Force) | Python In this article, we'll break down the brute-force solution step by step. Problem Statement Given an array of integers nums and an integer target, return the indices of the two numbers such that they 00
EOEnoch Olutunmidainthatsametechguy.com·Jul 21 · 6 min readLeetCode 3499: Maximise Active Section with TradeYou're given a binary string where 1 represents an active section and 0 represents an inactive one. You get exactly one trade: Erase a block of 1s that has 0s on both sides. Fill a block of 0s that 00
