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Sep 6, 2025 · 2 min read · 🚀 Building Blocks I Practiced Today Slow Fast Pointer - Finding middle of LL Also called as Hare & Tortoise Algorithm. Used for detecting cycle, finding middle, happy number, etc. O(n) time, O(1) space // Finding middle of a Linked List ...
Join discussionSep 5, 2025 · 2 min read · 🚀 Building Blocks I Practiced Today Frequency Map Using Hash Map Map<Integer, Integer> hm = new HashMap<>(); for(int num : nums){ hm.put(num, hm.getOrDefault((num, 0) + 1); } Frequency Map Using Arrays int[] freq = new int[26]; for(c...
Join discussionSep 1, 2025 · 3 min read · What I Built Today (Need for Finishing) Today, I built a console-based Expense Tracker Backend using Java. This project uses an ArrayList, Hash Map and .txt file to track expenses. Users can perform the following operations: Console-based backend si...
Join discussionAug 31, 2025 · 3 min read · What I Built Today Today, I built a console-based Student Grade using Java. This project uses an ArrayList, Hash Map and txt file to track grades. Users can perform the following operations: Add a student. Add subjects & marks for the respective st...
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