On Day 302 of the coding journey, I'm sharing my solution to LeetCode Problem 528, "Random Pick with Weight." This problem requires designing a data structure for weighted random selection. My video provides a clear walkthrough of the optimal strategy: using a Prefix Sums array to map weights to cumulative ranges, then performing a fast Binary Search to find the corresponding index. This is a valuable skill for system design and advanced data structure implementation. #DataStructures #Algorithms #LeetCode #CodingInterview #Programming #BinarySearch #PrefixSums

On Day 287 of my #300daysofcode challenge, I'm sharing my solution to LeetCode Problem 2125, "Number of Laser Beams in a Bank." This problem is an excellent example of a linear-time problem that requires careful state tracking. My video provides a clear walkthrough of this efficient method, which is a valuable skill for any developer and a great way to practice writing clean, logical code. #DataStructures #Algorithms #LeetCode #CodingInterview #Programming #ProblemSolving #300daysofcode

On Day 299 of my #300daysofcode challenge, I'm sharing my solution to LeetCode Problem 275, "H-Index II." The key to solving this problem efficiently is recognizing that the sorted input array creates a monotonic property that enables Binary Search. My video provides a clear walkthrough of the $O(\log N)$ search logic, a highly valued skill for technical interviews focused on algorithmic optimization. #DataStructures #Algorithms #LeetCode #CodingInterview #Programming #BinarySearch #300daysofcode

📅 Day 51 of #100DaysOfCode Problem: Number of Substrings That Satisfy (LeetCode 3280) Approach: 1️⃣ Precomputed cumulative counts of 1s using a prefix sum array. 2️⃣ For each substring [i...j], calculated both the number of 0s and 1s. 3️⃣ Used a smart optimization: If (zero² > one), skip forward — those substrings can’t satisfy the condition. If (zero² == one) or (zero² < one), count and move ahead efficiently. 4️⃣ This drastically reduced redundant iterations compared to a naïve O(n³) brute force. #100DaysOfCode #LeetCode #DSA #ProblemSolving #Cplusplus #CodingChallenge #Algorithms #MathLogic #BinaryString #Programming #DeveloperLife #CodingJourney #CodeNewbie #DailyDSA #SoftwareEngineering #KeepLearning #GrowthMindset #Motivation #TechCommunity

🚀 LeetCode Daily Challenge – Day 4 (November 2025) 🧩 Problem: 3318. Find X-Sum of All K-Long Subarrays I 📚 Topic: Arrays | Sliding Window | HashMap | Prefix Sum 🔍 Approach: Used a sliding window of size k to compute the X-sum for each subarray. Maintained frequency counts of elements within the window and dynamically updated the sum as elements entered and left the window. This approach efficiently avoids recalculating sums from scratch for every subarray. ✅ Time Complexity: O(n) ✅ Space Complexity: O(k) 💡 Key Takeaway: Sliding window problems reinforce how optimizing repetitive computations can drastically improve performance — small logic, big impact! ⚡ #LeetCode #LeetcodeDailyChallenge #Coding #DSA #SlidingWindow #Array #HashMap #Day4 #Programming #Engineering

On Day 296 of my #300daysofcode challenge, I'm sharing my solution to LeetCode Problem 154, "Find Minimum in Rotated Sorted Array II." This problem tests the limits of Binary Search when duplicates are present. My video provides a clear walkthrough of the modified search logic, which is a valuable skill for advanced technical interviews, demonstrating proficiency in handling edge cases within core algorithms. #DataStructures #Algorithms #LeetCode #CodingInterview #Programming #BinarySearch #300daysofcode

On Day 288 of my #300daysofcode challenge, I'm sharing my solution to LeetCode Problem 3354, "Maximum Length of Semi-Decreasing Subarrays II." This problem requires optimizing a brute-force approach. My video provides a clear walkthrough of the efficient Two-Pointer technique (or Monotonic Stack), which is a valuable skill for technical interviews and a great way to think about improving time complexity. #DataStructures #Algorithms #LeetCode #CodingInterview #Programming #Optimization #300daysofcode

On Day 295 of my #300daysofcode challenge, I'm sharing my solution to LeetCode Problem 981, "Time Based Key-Value Store." This problem requires designing a specialized data store for version control. My video provides a clear walkthrough of the optimal design: using a HashMap to quickly find the key and then applying Binary Search on the timestamps to retrieve the correct historical value. This is a valuable skill for advanced data structure implementation and system design interviews. #DataStructures #Algorithms #LeetCode #CodingInterview #Programming #SystemDesign #300daysofcode

On Day 289 of my #300daysofcode challenge, I'm sharing my solution to LeetCode Problem 3370, "Maximum Length of Semi-Decreasing Subarrays III." This complex problem is a great test of optimization skills. My video provides a clear walkthrough of the most efficient approach (likely involving Two Pointers or a Monotonic Stack), which is a valuable skill for advanced technical interviews and a great way to think about improving time complexity. #DataStructures #Algorithms #LeetCode #CodingInterview #Programming #Optimization #300daysofcode

On Day 298 of my #300daysofcode challenge, I'm sharing my solution to LeetCode Problem 74, "Search a 2D Matrix." This problem is a classic demonstration of adapting the Binary Search algorithm to a 2D structure. My video provides a clear walkthrough of the key optimization: mapping $(row, col)$ indices to a single linear index to perform a fast, $O(\log(M \cdot N))$ search. This is a valuable skill for technical interviews and efficient matrix manipulation. #DataStructures #Algorithms #LeetCode #CodingInterview #Programming #BinarySearch #300daysofcode