Niraj Gupta @nirajguptaa_
Computer Science student passionate about Coding, Algorithms, Web Development & Software Engineering. linkedin.com/in/nirajguptaa Chennai, India Joined March 2020-
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✅ Day 115 of #GFG160 & #geekstreak2025 📊 Problem:Palindrome SubStrings 🧠 Concept: Bottom-Up DP on substrings 📦 Approach: Expand for length ≥ 2, use DP table to check s[i] == s[j] && dp[i+1][j-1] #DP #String #Palindrome #CPP #Coding #GFG @geeksforgeeks
✅ Day 114 of #GFG160 & #geekstreak2025 📊 Problem: Longest Palindrome in a String 📦 Concept: LCS between String & its Reverse #DP #String #LCS #Palindrome #CPP #Coding #GFG @geeksforgeeks
✅ Day 113 of #GFG160 & #geekstreak2025 📊 Problem: Longest Palindromic Subsequence 📦 Concept: LCS between String & its Reverse ⚙️ Logic: If match, +1 diagonal; else, max left/top #DP #String #LCS #Palindrome #CPP #Coding #GFG @geeksforgeeks
✅ Day 112 of #GFG160 & #geekstreak2025 📊 Problem: Longest Common Subsequence 🧩 Input: Two Strings 📦 Concept: Dynamic Programming (2D DP Table) ⚙️ Logic: If match, +1 diagonal; else, max left/top #DP #String #LCS #CPP #Coding #GFG @geeksforgeeks
✅ Day 111 of #GFG160 & #geekstreak2025 📊 Problem: Longest String Chain 🧩 Input: Array of Words 📦 Concept: DP + HashMap + Length Sorting ⚙️ Logic: Try all predecessors by removing one char #DP #Hashing #String #DSA #CPP #Coding #GFG @geeksforgeeks
✅ Day 110 of #GFG160 & #geekstreak2025 📊 Problem: Longest Increasing Subsequence (LIS) 📦 Concept: Recursion + Memoization prevIndex #DP #Recursion #Memoization #DSA #CPP #Coding #GFG @geeksforgeeks
✅ Day 109 of #GFG160 & #geekstreak2025 📊 Problem: Longest Bounded-Difference Subarray 🕒 Time: O(N) | 💾 Space: O(N) 📦 Concept: Two Monotonic Deques (Min & Max) + Sliding Window #SlidingWindow #Deque #DSA #CPP #Coding #GFG @geeksforgeeks
✅ Day 108 of #GFG160 & #geekstreak2025 📊 Problem: K Sized Subarray Maximum 🕒 Time: O(N) | 💾 Space: O(K) 📦 Concept: Monotonic Deque for Efficient Sliding Window #DSA #CPP #Coding #GFG @geeksforgeeks
✅ Day 107 of #GFG160 & #geekstreak2025 📊 Problem: Decode the String 🕒 Time: O(N) | 💾 Space: O(N) 📦 Concept: Stack + Nested Repetition Handling #Stack #DSA #CPP #Coding #GFG @geeksforgeeks
✅ Day 106 of #GFG160 & #geekstreak2025 📊 Problem: Postfix Evaluation 🕒 Time: O(N) | 💾 Space: O(N) 📦 Concept: Stack-Based Expression Evaluation #Stack #DSA #CPP #Coding #GFG @geeksforgeeks
✅ Day 105 of #GFG160 & #geekstreak2025 📊 Problem: Get Min from Stack 🕒 Time: O(1) | 💾 Space: O(N) 📦 Concept: Stack + Auxiliary Min Stack 💡 Supports push, pop, peek, getMin in constant time! #Stack #DSA #CPP #Coding #GFG @geeksforgeeks
Just crossed 77% completion on the Strivers A2Z DSA Sheet by @takeUforward_ ! From Arrays to Graphs, it’s been a challenging yet rewarding journey through the core of DSA. Grateful for the consistency and clarity this sheet brings. Onwards to 💯%! 💪 #DSA #Striver @striver_79
✅ Day 104 of #gfg160 & #geekstreak2025 📊 Problem: Max of Min for Every Window Size 🕒 Time: O(N) | 💾 Space: O(N) 📦 Concept: Stack + Previous & Next Smaller Index #Stack #SlidingWindow #DSA #CPP #Coding @geeksforgeeks
✅ Day 103 of #gfg160 & #geekstreak2025 🏗️ Problem: Histogram Max Rectangular Area 🕒 Time: O(N) | 💾 Space: O(N) 📦 Concept: Stack + Next Smaller Elements (Left & Right) #Stack #Histogram #DSA #CPP #Coding @geeksforgeeks
✅ Day 102 of #gfg160 & #geekstreak2025 📈 Problem: Stock Span Problem 🕒 Time: O(N) | 💾 Space: O(N) 📦 Concept: Stack + Index Tracking #Stack #StockSpan #DSA #CPP #Coding @geeksforgeeks
✅ Day 101 of #gfg160 & #geekstreak2025 Problem: Next Greater Element 🕒 Time: O(N) | 💾 Space: O(N) #Stack #NGE #DSA #CPP #Coding @geeksforgeeks
✅ Day 100 of #gfg160 & #geekstreak2025 Problem: Longest Valid Parentheses 🕒 Time: O(N) | 💾 Space: O(N) #Stack #Parentheses #DSA #CPP #Coding @geeksforgeeks
✅ Day 99 of #gfg160 & #geekstreak2025 Problem: Parenthesis Checker 🕒 Time: O(N) | 💾 Space: O(N) #Stack #Brackets #DSA #CPP #Coding @geeksforgeeks
✅ Day 98 of #gfg160 & #geekstreak2025 Problem: Running Median from Stream 🕒 Time: O(N log N) | 💾 Space: O(N) #Heap #Median #PriorityQueue #DSA #CPP #Coding @geeksforgeeks
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