Sumit Kumar @SumitKumar9128
Backend developer with a passion for solving real-world problems. Maintaining my streak on GeeksforGeeks and LeetCode, one challenge at a time! linkedin.com/in/sumit-kumar… India Joined February 2024-
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⚡️ Day 360 of #geekstreak2025 ✅ GFG POTD: Find length of Loop 🧠 Used Floyd’s Cycle Detection (slow & fast pointers). Once a cycle is detected, counted nodes till slow & fast meet again. Efficient way to handle loops in linked lists #dsa #java #geekstreak2025
⚡️ Day 359 of #geekstreak2025 ✅ GFG POTD: Sort a linked list of 0s, 1s and 2s 🧠 Counted occurrences of 0, 1 & 2 in the list, then reassigned values in a second traversal. Simple counting + overwrite = neat & efficient #dsa #java #gfg160 #geekstreak2025
⚡️ Day 358 of #geekstreak2025 Tried today’s POTD (Linked List Group Reverse) but couldn’t submit on GFG because of a technical issue 🙃 Still solved it locally though — so streak is alive! See you tomorrow🙃
🔥 Day 357 of #geekstreak2025 ✅ GFG POTD: Reverse a Doubly Linked List 🧠 Iterated through list → swapped next & prev for each node → tracked last valid node as new head. Elegant in-place reversal, no extra space. #dsa #java #linkedlist #geekstreak2025
🔥 Day 356 of #geekstreak2025 ✅ GFG POTD: Swap Kth Nodes from Ends 🧠 First counted total nodes → located k-th from start & k-th from end → swapped their values. Straightforward pointer traversal, no extra space needed #dsa #java #linkedlist #gfg160 #geekstreak2025
🔥 Day 355 of #geekstreak2025 ✅ GFG POTD: Sum of Mode 🧠 Used a sliding window + frequency map + treeMap buckets: Maintain element frequencies Track mode dynamically per window Sum up modes across all windows efficiently. #dsa #java #slidingwindow #geekstreak2025
🔥 Day 354 of #geekstreak2025 ✅ GFG POTD: Container With Most Water 🧠 Used two-pointer approach Start from both ends, calculate area Move pointer of the smaller height inward Track max area throughout #dsa #java #twopointers #gfg160 #geekstreak2025
🔥 Day 353 of #geekstreak2025 ✅ GFG POTD: The Celebrity Problem 🧠 Brute force check for each person They don’t know anyone else Everyone else knows them If both hold, that’s the celebrity. #dsa #java #gfg160 #geekstreak2025
🔥 Day 352 of #geekstreak2025 ✅ GFG POTD: Smallest Window Containing All Characters 🧠 Applied sliding window + hashmap frequency tracking → expand right pointer until all chars of p are covered, then shrink from left to minimize window. #java #slidingwindow #geekstreak2025
🔥 Day 351 of #geekstreak2025 ✅ GFG POTD: Maximize Number of 1’s 🧠 Used sliding window approach → expand window while counting zeros, shrink it when zeros exceed k. kept track of max window length = longest subarray with at most k flips to 1. #gfg160 #geekstreak2025
🔥 Day 350 of #geekstreak2025 ✅ GFG POTD: Count the number of possible triangles 🧠 Sorted the array & fixed the largest side. then applied two-pointer approach → if arr[left] + arr[right] > arr[i], all pairs between left..right-1 are valid triangles. #geekstreak2025
🔥 Day 349 of #geekstreak2025 ✅ GFG POTD: Check if a String is Subsequence of Other 🧠 Used a stack-based approach → pushed chars of s1 and matched them backward with s2. if stack gets empty, s1 is subsequence of s2... #dsa #java #gfg160 #geekstreak2025
🔥 Day 348 of #geekstreak2025 ✅ GFG POTD: Maximize Median After K Additions 🧠 Sorted array → focused only on the upper half (since median lies there). Used gaps between elements to distribute k efficiently. Greedy + math-driven approach to maximize median. #dsa #java #gfg160
🔥 Day 347 of #geekstreak2025 ✅ GFG POTD: Minimum Days to Make M Bouquets 🧠 Tried a greedy shortcut → sort + pick the (m×k)(m \times k)(m×k)-th bloom day. Works for some cases, but not the most efficient (ideal approach = Binary Search on Days). #dsa #gfg160 #geekstreak2025
🔥 Day 346 of #geekstreak2025 ✅ GFG POTD: Allocate Minimum Pages 🧠 Solved using Binary Search on Answer – checked the feasibility of distributing books among students by keeping the max pages minimal. Classic partition problem #dsa #java #binarysearch #gfg160 #geekstreak2025
🔥 Day 345 of #geekstreak2025 ✅ GFG POTD: Median in a Row-wise Sorted Matrix 🧠 Took the brute force route — flattened the matrix, sorted it, and grabbed the middle element. Not the most optimal, but works fine for manageable sizes #dsa #java #gfgpotd #gfg160 #geekstreak2025
🔥 Day 344 of #geekstreak2025 ✅ GFG POTD: Maximize the Minimum Difference between k elements 🧠 Sorted the array + used binary search on answer. Checked feasibility with a greedy placement strategy. Classic BS on constraints pattern #dsa #java #gfgpotd #gfg160 #geekstreak2025
🔥 Day 343 of #geekstreak2025 ✅ GFG POTD: Search in Fully Rotated Sorted 2D Matrix 🧠 Tried brute-force first (works fine), but then optimized with a binary search treating the matrix as 1D + handling rotation logic. Much faster & cleaner #dsa #java #gfgpotd #gfg160
🔥 Day 342 of #geekstreak2025 ✅ GFG POTD: Farthest Smaller Right 🧠 Precomputed suffix minima & used binary search to find the farthest index with a smaller element on the right for each position. #dsa #java #gfgpotd #gfg160 #geekstreak2025 #binarysearch
🔥 Day 341 of #geekstreak2025 ✅ GFG POTD: Find H-Index 🧠 Applied binary search on possible h values. For each mid, counted papers with ≥ citations. Adjusted search until max valid h found. #dsa #java #gfgpotd #gfg160 #geekstreak2025 #binarysearch
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