Rahul Kumar Gupta @reply2rahulkr

🚀 Software Developer | ⚛️ React.js Devloper | ☕ Java Programmer | linkedin.com/in/rahul-kumar… Bihar, India Joined June 2024

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Rahul Kumar Gupta @reply2rahulkr

a month ago

✨ Completed the #GfG160 Challenge by @geeksforgeeks! 👕🎉 160 days of daily coding, growth & consistency 💪 Huge thanks to GfG for this amazing journey! 🚀 Keep learning. Keep pushing. It’s worth it! #GeeksforGeeks #Coding #GfG160 #ProblemSolving #KeepLearning #CodeEveryday

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Rahul Kumar Gupta @reply2rahulkr

a month ago

Day 1 - Odd or Even ✅ Used % in Java to check even or odd. Simple start to DSA journey! 🔗 Course Link :- geeksforgeeks.org/batch/skill-up… #skillupwithgfg #nationskillup

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Rahul Kumar Gupta @reply2rahulkr

a month ago

📅 Day 108 ✅ Solved: Maximum of all subarrays of size k 💡 Used Deque to slide through window efficiently 🧪 Passed all 1111 / 1111 test cases! #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

2 months ago

📅 Day 107 ✅ Solved: Decode the String 🔁 Used 2 stacks to decode patterns like 3[a2[c]] 🎯 Passed all 1207 test cases! #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

2 months ago

✅ GfG POTD Day 106 Problem: Postfix Evaluation 🧮 Used a stack to evaluate expressions 🔄 Checked operators, applied on top elements ⚙️ Operations handled via a switch-case 📈 1115/1115 test cases passed #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

2 months ago

🏆 GfG POTD Day 105 Problem: Get Min from Stack 🧠 Tracked current minimum using an extra stack 📉 Updated min during push/pop operations 🕒 Time: O(1) per operation #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

2 months ago

🏆 GfG POTD Day 104 Problem: Max of Min for Every Window Size 🧮 Used stacks to find previous & next smaller elements 🪟 Filled result array for each window size 🕒 Time: O(N), Space: O(N) #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

2 months ago

🏆 GfG POTD Day 103 Problem: Maximum Rectangular Area in Histogram 📊 Used Stack to track previous smaller bars 📐 Calculated width × height for max area 💡 Time: O(N), Space: O(N) #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

2 months ago

🔥 GfG POTD Day 102 Problem: Stock Span Problem 📈 Used stack to track indices of previous higher elements 🔁 Calculated span for each day ⚡ Time: O(N), Space: O(N) #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

2 months ago

🔥 GfG POTD Day 101 Problem: Next Greater Element 🧠 Used stack to store indices 🔁 For each element, popped smaller ones ⚡ Time: O(N), Space: O(N) #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

2 months ago

🎯 GfG POTD Day 100 Problem: Longest Valid Parentheses 🧠 Used stack to track matching ( and ) 📏 Stored indices to compute max length ⏱ O(N) time, O(N) space #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

2 months ago

📌 GfG POTD Day 99 Problem: Valid Parentheses ✅ Used stack to match pairs (), {}, [] 🧠 Return true if stack empty at end ⏱ O(N) time, O(N) space #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

2 months ago

📌 GfG POTD Day 98 Problem: Median in a Stream ✅ Used Max & Min Heaps to track median ⚖️ Balanced sizes while inserting ⏱ O(log N) per operation #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

2 months ago

📌 GfG POTD Day 97 Problem: Merge K Sorted Lists ✅ Used Min Heap to pick smallest node 🔁 Linked nodes to build result ⏱ O(N log K) #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

3 months ago

🚀 GfG POTD (Day 96) Problem: K Closest Points to Origin 🧠 Used Max Heap to keep track of the K closest points. 📏 Distance calculated using Euclidean formula (without sqrt for optimization). ⏱ Time Complexity: O(N log K) #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

3 months ago

🎯 GfG POTD (Day 95) Problem: K Largest Elements ✅ Used a Min Heap to maintain top K elements efficiently. 🔁 Reversed the result for descending order output. ⏱️ Time Complexity: O(N log K) #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

3 months ago

🎉GfG POTD (Day 94)🏆 Problem: Serialize and Deserialize a Binary Tree 👉 Used pre-order traversal with -1 markers for nulls. 👉 Efficient recursive logic for both serialization and deserialization! #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

3 months ago

🎉GfG POTD (Day 93)🏆 Problem: Lowest Common Ancestor in BST 👉 Used BST rules to locate the split point. 👉 Achieved O(H) time with clean recursion! #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

3 months ago

🎉GfG POTD (Day 92)🏆 Today's Problem: Fixing Two Nodes of a BST 👉 Used in-order traversal to detect misplaced nodes. 👉 Identified and swapped the two incorrect nodes. 👉 Achieved O(N) time & O(H) space complexity (recursive stack). #gfg160 #geekstreak2025 @geeksforgeeks

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Rahul Kumar Gupta @reply2rahulkr

3 months ago

🎉GfG POTD (Day 91)🏆 Today's Problem: Pair Sum in BST 👉 Used in-order traversal to get sorted values. 👉 Applied two-pointer technique to check for the target sum. 👉 Time Complexity: O(N), Space: O(N) #gfg160 #geekstreak2025 @geeksforgeeks