Spiral Matrix II Solution in Python

Explored object identity, how lists store references, the difference between mutable and immutable objects, along with split() & join() and negative indexing & slicing. These concepts deepen understanding of how Python works internally. 🐍💪 #NEXTGENFREEDU🚀 #Python #LearningJourney #ProgrammingConcepts #SkillDevelopment

Learned about the ord() and chr() functions for character–Unicode conversion, the round() function for numerical precision, and proper variable naming conventions. These basics make code more readable and reliable. 🐍💪 #NEXTGENFREEDU🚀 #Python #LearningJourney #ProgrammingBasics #SkillDevelopment

LeetCode | Rearrange Array Elements by Sign 💻 🔹 Approach: Index placement 🔹 Key idea: Place positives at even indices and negatives at odd indices 🔹 Time Complexity: O(n) 🔹 Space Complexity: O(n) Daily DSA practice to stay consistent and improve logic 🚀 #LeetCode #DSA #Arrays #Python #CodingJourney #LearningInPublic

Day 7 of LeetCode 🚀 | 3Sum Closest Today’s problem was 3Sum Closest — finding three numbers whose sum is closest to a given target. Approach: Sort the array Fix one element and use the two-pointer technique Update the closest sum based on minimum difference Adjust pointers to move toward the target ⏱️ Time Complexity: O(n²) 📦 Space Complexity: O(1) #LeetCode #Day6 #DSA #ProblemSolving #TwoPointers #Python #CodingJourney

LeetCode | Find the Smallest Divisor Given a Threshold ➗ 🔹 Approach: Binary Search on Answer 🔹 Key idea: Minimize the divisor while keeping the sum ≤ threshold 🔹 Time Complexity: O(n log(max(nums))) 🔹 Space Complexity: O(1) Daily DSA practice to improve problem-solving skills 🚀 #LeetCode #DSA #BinarySearch #Python #CodingJourney #LearningInPublic

LeetCode Problem 73: "Set Matrix Zeroes": Given an m x n integer matrix matrix, if an element is 0, set its entire row and column to 0's. You must do it in place. The below implementation in Python successfully resolves this problem in optimal way with constant space complexity. The logic is quite straightforward, use the first row and column as markers to determine whether the row or column contains zero inside or not. But before this traverse the first row and column to check whether they contain zeroes or not, store this result in a boolean variable. Now based on markers make the values of corresponding cells as zero. Time Complexity: O(m*n) #DSA #LeetCode #Python #OptimalSolution #Matrix #CompetitiveProgramming #ProblemSolving #CodingChallenge #Algorithms #Logic #DataStructures

Day 42 ✅ | Reverse Linked List Revisited one of the most important linked list problems today. The goal is to reverse the list in-place by carefully adjusting node pointers. Key ideas used: Maintain prev and curr pointers Temporarily store the next node Reverse links step by step while traversing the list This problem is a great reminder that mastering the basics makes harder problems much easier 💪 #Python #LeetCode #LinkedList #ReverseLinkedList #ProblemSolving #Day42 #CodingJourney #DSA #Algorithms #DataStructures

Solved "Encode and Decode Strings" (LeetCode 271) The trick? Use a length-prefixed encoding: <length>#<string> For example: ["lint","code"] → "4#lint4#code" Why this works: The length tells the decoder exactly how many characters to read No delimiter conflicts — even if the string itself contains # or digits O(n) time and space A clean example of how a simple idea can handle all edge cases elegantly. #leetcode #dsa #python #problemsolving

Day 225 of #365DaysOfCode Solved Range Sum Query 2D – Immutable today using a 2D prefix sum approach. By preprocessing cumulative sums, each submatrix query can be answered in O(1) time. This problem reinforced the importance of choosing the right preprocessing strategy to optimize repeated queries. Continuing to focus on clarity, correctness, and efficiency. #365DaysOfCode #Day225 #DSA #LeetCode #Python #DataStructures #ProblemSolving #Consistency

LeetCode | Squares of a Sorted Array 🔢 🔹 Approaches: • Two Pointers (Optimal) • Square + Sort 🔹 Time Complexity: O(n) optimal / O(n log n) sorting 🔹 Space Complexity: O(n) Daily DSA practice to improve logic and consistency 🚀 “We compare absolute values from both ends to build the sorted squares efficiently.” #LeetCode #DSA #Arrays #TwoPointers #Python #CodingJourney #LearningInPublic