Merging Two Sorted Linked Lists in LeetCode

🚀 Day 44/60 — LeetCode Discipline Problem Solved: Regular Expression Matching Difficulty: Hard Today’s problem was one of the toughest so far. It involved implementing regex matching with support for: • '.' → matches any single character • '*' → matches zero or more of the previous element 💡 Key Insight: This problem is solved using Dynamic Programming + Recursion (Memoization). Instead of checking blindly, we store intermediate results to avoid recomputation. 💡 Key Learnings: • Understanding recursion deeply • Using memoization to optimize overlapping subproblems • Handling multiple cases carefully (especially '*') • Thinking in terms of states → dp(i, j) ⚡ Performance: Runtime: 6 ms Like solving a maze… every wrong turn teaches something— and every remembered path saves time. This wasn’t just coding— this was strategy. #leetcode #coding #programming #developer #softwareengineer #codinglife #coders #code #python #java #cpp #javascript #webdevelopment #machinelearning #ai #artificialintelligence #datascience #100daysofcode #60daysofcode #dsa #datastructures #algorithms #dynamicprogramming #dp #recursion #memoization #backtracking #hardproblem #codingchallenge #dailycoding #problem-solving #codingjourney #tech #technology #developerlife #programmerlife #learncoding #codingcommunity #codersofinstagram #instacoder #techlife #devcommunity #softwaredeveloper #engineerlife #codingmotivation #growthmindset #consistency #nevergiveup #studentlife #btech #computerscience #aiml #futureengineer #placements #internship #careergoals #studygram #learning #keepgoing #successmindset #hustle #grind #explorepage #trending #viral #reels #linkedinpost #github #opensource #100xdev #faangprep #interviewprep

🚀 Day 47/60 — LeetCode Discipline Problem Solved: Swap Nodes in Pairs Difficulty: Medium 💡 Approach: • Use a dummy node to simplify head swaps • Track previous node before each pair • Swap adjacent nodes by rewiring pointers • Move forward pair by pair ⚡ Performance: Runtime: 0 ms Today’s lesson: Linked Lists do not forgive careless pointer work. One wrong connection, and the whole chain breaks. Mastering linked lists teaches patience, precision, and discipline— three qualities every strong programmer must possess. #leetcode #coding #programming #python #dsa #algorithms #linkedlist #pointers #datastructures #problem-solving #developer #softwareengineer #100daysofcode #60daysofcode #codingjourney #competitiveprogramming #interviewprep #placements #internship #tech #computerscience #btech #aiml #studentdeveloper #dailycoding #developerlife #codingcommunity #softwaredeveloper #futureengineer #consistency #discipline #growthmindset #learncoding #codersofinstagram #techlife #grind #successmindset #trending #explorepage

🚀 Day 58/60 — Keeping Only the True Ones Problem Solved: Remove Duplicates from Sorted List II Difficulty: Medium 💡 Approach: • Use a dummy node to handle edge cases • Traverse the list with two pointers (prev & curr) • Detect duplicate groups • Skip all nodes that have duplicates • Keep only distinct values ⚡ Performance: Runtime: 2 ms 💡 What I Learned: • Handling linked list edge cases • Difference between removing duplicates vs removing duplicate values entirely • Pointer manipulation mastery 🌿 Insight: Not everything repeated deserves to stay… Sometimes, strength lies in removing what’s common and preserving only what’s rare. #leetcode #coding #programming #python #dsa #algorithms #linkedlist #datastructures #problem-solving #developer #softwareengineer #100daysofcode #60daysofcode #codingjourney #competitiveprogramming #interviewprep #placements #internship #tech #computerscience #btech #aiml #studentdeveloper #dailycoding #developerlife #codingcommunity #softwaredeveloper #futureengineer #consistency #discipline #growthmindset #learncoding #codersofinstagram #techlife #grind #successmindset #explorepage #trending #linkedlistproblems #interviewquestions #codinglife #techcommunity #buildinpublic #learnbydoing #codeeveryday #nevergiveup #motivation #successjourney

🚀 Day 49/60 — LeetCode Discipline Problem Solved: Count and Say Difficulty: Medium 💡 Approach: • Start with base string "1" • Build each next sequence using Run-Length Encoding • Count consecutive digits • Append count + digit to form next string ⚡ Performance: Runtime: 7 ms (Efficient & Clean) 💡 Key Insight: Each term is a description of the previous one. You don’t compute the answer… you observe and narrate it. 💡 What I Learned: • Strong string manipulation • Pattern building step-by-step • Importance of handling edge cases (last group) Consistency is not loud. It is quiet, repetitive, and powerful. #leetcode #coding #programming #python #dsa #algorithms #strings #patternrecognition #datastructures #problem-solving #developer #softwareengineer #100daysofcode #60daysofcode #codingjourney #competitiveprogramming #interviewprep #placements #internship #tech #computerscience #btech #aiml #studentdeveloper #dailycoding #developerlife #codingcommunity #softwaredeveloper #futureengineer #consistency #discipline #growthmindset #learncoding #codersofinstagram #techlife #grind #successmindset #explorepage #trending

🚀 Day 55/60 — Refining the Structure Problem Solved: Remove Duplicates from Sorted List Difficulty: Easy 💡 Approach: • Traverse the linked list • Compare current node with next node • If duplicate → skip it • Else → move forward ⚡ Performance: Runtime: 0 ms (Optimal) 💡 What I Learned: • Linked list traversal • Pointer manipulation • Handling duplicates efficiently 🌿 Insight: In a sorted world, duplicates stand side by side… making them easier to eliminate. Simplicity is not weakness— it is mastery. #leetcode #coding #programming #python #dsa #algorithms #linkedlist #datastructures #problem-solving #developer #softwareengineer #100daysofcode #60daysofcode #codingjourney #competitiveprogramming #interviewprep #placements #internship #tech #computerscience #btech #aiml #studentdeveloper #dailycoding #developerlife #codingcommunity #softwaredeveloper #futureengineer #consistency #discipline #growthmindset #learncoding #codersofinstagram #techlife #grind #successmindset #explorepage #trending

🚀 Just came across an incredible FREE course on API development using Python — and it’s honestly one of the most comprehensive resources out there! Python API Development - Comprehensive Course for Beginners If you're someone aiming to get into backend development, this course is a goldmine. It doesn’t just teach theory — it walks you through building a production-ready API using FastAPI from scratch. 💡 What makes this course stand out: ➡️Covers API fundamentals like routes, HTTP methods, and request handling ➡️Deep dive into schema validation with Pydantic ➡️Hands-on implementation of CRUD operations ➡️Integration with SQL databases ➡️Testing using pytest ➡️Even introduces CI/CD pipelines with GitHub Actions What I really liked is how it blends core backend concepts + real-world implementation, making it perfect for beginners as well as those looking to strengthen their fundamentals. A big thank you to freeCodeCamp and the creator sanjeev thiyagarajan for putting together such a valuable and accessible resource for the developer community 🙌 Whether you're preparing for internships, building projects, or just exploring backend engineering — this is definitely worth your time. 📌 Highly recommend giving it a watch and building along! #Python #BackendDevelopment #FastAPI #WebDevelopment #APIs #Coding #Learning #SoftwareEngineering https://lnkd.in/gk6ikewR

🚀 Day 69/60 — Finding What Changed Problem Solved: Find the Difference Difficulty: Easy 💡 Approach: • Use XOR (^) on all characters of both strings • Same characters cancel each other out • The remaining value gives the extra character • Convert back to character using chr() ⚡ Performance: Runtime: 0 ms 💡 What I Learned: • Clever use of bit manipulation (XOR) • How patterns cancel out in computations • Writing elegant and minimal solutions 🌿 Insight: Sometimes the difference isn’t loud or obvious… it quietly remains after everything else cancels out. And that subtle change makes all the difference. #leetcode #coding #programming #python #dsa #algorithms #strings #bitmanipulation #datastructures #problem-solving #developer #softwareengineer #100daysofcode #60daysofcode #codingjourney #competitiveprogramming #interviewprep #placements #internship #tech #computerscience #btech #aiml #studentdeveloper #dailycoding #developerlife #codingcommunity #softwaredeveloper #futureengineer #consistency #discipline #growthmindset #learncoding #codersofinstagram #techlife #grind #successmindset #explorepage #trending #stringproblems #interviewquestions #codinglife #buildinpublic #learnbydoing #codeeveryday #nevergiveup #motivation #successjourney #techcommunity

🚀 Day 67/60 — Turning Words Around Problem Solved: Reverse Words in a String Difficulty: Medium 💡 Approach: • Split the string into words using split() • Store words in a list (ignoring extra spaces automatically) • Traverse the list in reverse order • Join them back with a single space ⚡ Performance: Runtime: 3 ms 💡 What I Learned: • Handling strings with irregular spaces • Importance of clean formatting in outputs • Reverse traversal logic in a practical scenario 🌿 Insight: Life, like a sentence, often feels scattered… but when you rearrange it with clarity, even chaos begins to make sense. #leetcode #coding #programming #python #dsa #algorithms #strings #datastructures #problem-solving #developer #softwareengineer #100daysofcode #60daysofcode #codingjourney #competitiveprogramming #interviewprep #placements #internship #tech #computerscience #btech #aiml #studentdeveloper #dailycoding #developerlife #codingcommunity #softwaredeveloper #futureengineer #consistency #discipline #growthmindset #learncoding #codersofinstagram #techlife #grind #successmindset #explorepage #trending #stringproblems #interviewquestions #codinglife #buildinpublic #learnbydoing #codeeveryday #nevergiveup #motivation #successjourney #techcommunity

🚀 Day 68/60 — Reversing the Fundamentals Problem Solved: Reverse String Difficulty: Easy 💡 Approach: • Use two pointers — one at the start, one at the end • Swap characters while moving inward • Continue until both pointers meet • Perform everything in-place (no extra space) ⚡ Performance: Runtime: 0 ms 💡 What I Learned: • Power of two-pointer technique • Writing memory-efficient (O(1)) solutions • Simplicity can still be optimal 🌿 Insight: Sometimes growth isn’t about adding more… it’s about turning things around, and seeing the same path from a wiser side. #leetcode #coding #programming #python #dsa #algorithms #strings #datastructures #problem-solving #developer #softwareengineer #100daysofcode #60daysofcode #codingjourney #competitiveprogramming #interviewprep #placements #internship #tech #computerscience #btech #aiml #studentdeveloper #dailycoding #developerlife #codingcommunity #softwaredeveloper #futureengineer #consistency #discipline #growthmindset #learncoding #codersofinstagram #techlife #grind #successmindset #explorepage #trending #stringproblems #interviewquestions #codinglife #buildinpublic #learnbydoing #codeeveryday #nevergiveup #motivation #successjourney #techcommunity

🚀 Day 57/60 — The Art of Guessing Smart Problem Solved: Guess Number Higher or Lower Difficulty: Easy 💡 Approach: • Apply Binary Search • Adjust range based on API response • Narrow down until the correct number is found ⚡ Performance: Runtime: 11 ms 💡 What I Learned: • Binary search with conditions • Working with APIs (guess function) • Decision-based narrowing 🌿 Insight: Don’t guess blindly… guess wisely, and reduce uncertainty each step. #leetcode #coding #programming #python #dsa #algorithms #binarysearch #datastructures #problem-solving #developer #softwareengineer #100daysofcode #60daysofcode #codingjourney #competitiveprogramming #interviewprep #placements #internship #tech #computerscience #btech #aiml #studentdeveloper #dailycoding #developerlife #codingcommunity #softwaredeveloper #futureengineer #consistency #discipline #growthmindset #learncoding #codersofinstagram #techlife #grind #successmindset #explorepage #trending