Raunak Sachdeva
@RaunakSachdeva_
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Joined February 2023
Day 65/160 - GFG Challenge 📊 Problem: Longest Subarray with Given Sum 🧠 Approach: Prefix Sum + HashMap ✅ Passed 1115/1115 test cases 🎯 Accuracy: 100% ⚡ Time Taken: 1.3s #100DaysOfCode #DSA #Java #GFG #Day65 #CodingChallenge
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Day 64/160 - GFG Challenge 🔁 Problem: Product Array Puzzle 🧠 Approach: Prefix & Suffix Product (no division used) ✅ Passed 1112/1112 test cases 🎯 Accuracy: 100% ⚡ Time Taken: 0.81s #100DaysOfCode #DSA #Java #GFG #Day64 #CodingChallenge
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Day 63/160 - GFG Challenge 🔁 Problem: Largest Subarray with Equal 0s and 1s 🧠 Approach: Transform 0→-1 + Prefix Sum + HashMap ✅ Passed 1111/1111 test cases ⚠️ Accuracy: 50% (got it right in 2nd try) 🕒 Time: 0.86s #100DaysOfCode #DSA #Java #GFG #Day63 #CodingJourney
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Day 62/160 - GFG Challenge ⚖️ Problem: Find Equilibrium Point in an Array 🔁 Prefix sum trick: Efficient O(n) solution ✅ 1115/1115 test cases passed 💯 100% accuracy | ⏱️ Time: 0.8s 🔍 Balanced logic, clean math. #100DaysOfCode #DSA #Java #GFG #Day62 #CodingChallenge
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Day 61/160 - GFG Challenge 🧬 Problem: Clone a Linked List with Random Pointers 🛠️ 3-pass approach using in-place clone nodes ✅ 1111/1111 test cases passed 💯 100% accuracy | ⏱️ Time: 0.6s 🎯 8/8 points #100DaysOfCode #Java #DSA #LinkedList #GFG #Day61
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Day 60/160 - GFG Challenge 🔁 Problem: Reverse Nodes in k-Group 🧵 Tackled tricky linked list pointer updates ✅ Passed 1115/1115 test cases 💯 100% accuracy | ⏱️ Time: 0.88s 🎯 8/8 points | Precision and logic aligned! #100DaysOfCode #Java #DSA #LinkedList #GFG #Day60
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Day 58/160 - GFG Challenge 🔁 Problem: Detect loop in a linked list 🐢🦇 Used Floyd's Cycle Detection (Tortoise & Hare) 🧠 1 retry but finally passed 1115/1115 cases! ✅ 4/4 pts | ⚡ Time: 0.59s #100DaysOfCode #DSA #Java #LinkedList #GFG #Day58
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Day 57/160 - GFG Challenge 🧮 Problem: Add two numbers represented by linked lists 🌀 Used reversal to simplify addition & handled leading 0s 😮💨 Took 4 attempts, but finally nailed all 1111/1111 test cases! ✅ 4/4 pts | 🕒 1.57s #100DaysOfCode #Java #DSA #LinkedList #GFG #Day57
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Day 57/160 - GFG Challenge 🧮 Problem: Add two numbers represented by linked lists 🌀 Used reversal to simplify addition & handled leading 0s 😮💨 Took 4 attempts, but finally nailed all 1111/1111 test cases! ✅ 4/4 pts | 🕒 1.57s #100DaysOfCode #Java #DSA #LinkedList #GFG #Day57
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Day 56/160 - GFG Challenge 🔁 Problem: Merge two sorted linked lists ✨ Smooth logic with dummy node + pointer juggling 🧠 1st attempt AC! ✅ 1110/1110 Passed | 🕒 0.64s | 🟢 4/4 pts #100DaysOfCode #Java #DSA #LinkedList #GFG #Day56
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Day 55/160 - GFG Challenge 🔁 Problem: Rotate a linked list by K nodes 🔧 Got it in 3 attempts — the logic needed edge case handling! 🧠 Used modulo + pointer redirection ✅ 1115/1115 Passed | 🕒 1.56s | 🟢 4/4 pts #100DaysOfCode #Java #DSA #LinkedList #GFG #Day55
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Day 54/160 - GFG Challenge 🔁 Problem: Find the first node of a loop in a linked list 🚀 Approach: Floyd’s Cycle Detection (Tortoise & Hare) ✅ 1115/1115 Passed | ⚡ 0.79s | 🟢 2/2 pts Elegant & efficient. Constant space, linear time. #100DaysOfCode #Java #DSA #GFG #Day54
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Day 53/160 - GFG Challenge 🧠 Problem: Count subarrays with XOR equal to K 📌 Used prefix XOR with HashMap for optimal solution ✅ 1115/1115 Passed | ⚡ 0.55s | 🟢 4/4 pts Brute force? Too slow. Optimization wins! #100DaysOfCode #Java #DSA #GFG #Day53
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Day 52/160 - GFG Challenge 🔁 Problem: Reverse a Linked List ✨ Classic pointer reversal in action ✅ 1115/1115 Passed | ⏱️ 1.1s | 🟢 2/2 pts 100% accuracy on 1st go! ➡️ Next: Rotate a Linked List #100DaysOfCode #Java #DSA #GFG #Day52
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Day 51/160 - GFG Challenge 📊 Problem: Subarrays with Sum K 🧠 Used prefix sum + HashMap to track counts ✅ Passed 1111/1111 | ⏱️ 0.63s | 🟢 4/4 pts 🎯 100% Accuracy in 1st attempt #100DaysOfCode #Java #GFG #DSA #Day51
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✅ Day 49/160 GFG Challenge Complete! 🎯 Problem: Longest Consecutive Subsequence 🔍 Approach: Sorted the array and used a linear pass to count consecutive elements #DSAWithJava #100DaysOfCode #Day49Done #GeeksForGeeks #ConsecutiveStreaks #CleanCode
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✅ Day 48/160 GFG Challenge Complete! 🎯 Problem: Find the Union of Two Arrays 🔍 Approach: Used a single HashSet to merge both arrays and eliminate duplicates #DSAWithJava #100DaysOfCode #HashSetMagic #Day48Done #GeeksForGeeks #UnionOperation
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✅ Day 47/160 GFG Challenge Complete! 🎯 Problem: Intersection of Two Arrays with Duplicate Elements 🔍 Approach: Utilized two HashSets – one to store elements of the first array, another for the result #DSAWithJava #gfg160 #gfg #SetOperations #Day47Done #GeeksForGeeks
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