Ankit kumar

DSA • Web Development • Open Source
C++ | JavaScript | React
🚀 Learning & Building

[Ankit kumar @Ankit_kumar_290]

Day 17 of my #DSAJourney 🚀

Solved LeetCode 34 –
The most important concept I learned: left and right are boundaries of the search space, not directions. 🧠

Slowly improving my problem-solving and understanding the “why” behind every step. 💪

#LeetCode #DSA #BinarySearch

[Ankit kumar @Ankit_kumar_290]

🚀 Day 16 of my DSA Journey

Today I solved 2 Binary Search problems:

🔹 LeetCode 852 — Peak Index in a Mountain Array 🏔️
🔹 LeetCode 153 — Find Minimum in Rotated Sorted Array 🔄
#DSA #DSAJourney #LeetCode #BinarySearch #ProblemSolving

[Ankit kumar @Ankit_kumar_290]

🚀 Day 15 of my DSA Journey

Solved LeetCode 560 — Subarray Sum Equals K ✅

📌 Approach: Prefix Sum + HashMap
⏱️ Time: O(n)
💾 Space: O(n)
One step closer to mastering DSA, one problem at a time. 💪🔥
#DSA #DSAJourney #LeetCode #Coding #CPlusPlus #ProblemSolving

[Ankit kumar @Ankit_kumar_290]

Day 14 of my DSA Journey 🚀

Today I solved:

🔹 21. Merge Two Sorted Lists — Recursion 🔗
🔹 138. Copy List with Random Pointer — HashMap + Deep Copy 🧠
Two more problems solved, two more concepts understood! 💪🔥

#DSA #LeetCode #100DaysOfCode #CodingJourney #Cpp

[Ankit kumar @Ankit_kumar_290]

Day 13 of my DSA Journey 🚀

Today I solved:
🔹 141. Linked List Cycle — Slow & Fast Pointers 🐢🐇
🔹 142. Linked List Cycle II — Floyd’s Cycle Detection 🔄
Understanding pointers better, one problem at a time! 💪
#DSA #LeetCode #100DaysOfCode #CodingJourney #Cpp

[Ankit kumar @Ankit_kumar_290]

Day 12 of my DSA Journey 🚀

Today I solved:
🔹 206. Reverse Linked List — 3-pointer approach 🔄
🔹 876. Middle of the Linked List — Slow & Fast pointers 🐢🐇
Learning one concept at a time and getting better every day! 💪
#DSA #LeetCode #100DaysOfCode #CodingJourney #Cpp

[Ankit kumar @Ankit_kumar_290]

After a short break, I’m finally getting back to studying. 📚

No excuses, no pressure—just consistency from today. 🔥

[Ankit kumar @Ankit_kumar_290]

Day 11 of my DSA Journey 🚀

Today I solved LeetCode 443 – String Compression 🧩

Used the Two Pointer / In-place approach to compress consecutive characters efficiently.

Learning, solving & improving every day! 💪

#DSA #LeetCode #100DaysOfCode #CodingJourney

[Ankit kumar @Ankit_kumar_290]

Day 10 of my DSA Journey 🚀

Today I solved 2 LeetCode problems:
🔹 54. Spiral Matrix — Boundary Traversal
🔹 240. Search a 2D Matrix II — Top-Right Search
Learning step by step, one problem at a time. 💪
#DSA #LeetCode #100DaysOfCode #CodingJourney #Cpp

[Ankit kumar @Ankit_kumar_290]

Day 10 of #DSACodingChallenge 🚀

Solved LeetCode 2596 – Check Knight Tour Configuration.

Learned how recursion validates each knight move by exploring all 8 possible directions and ensuring the sequence follows the expected path.

#LeetCode #CPP #DSA #Recursion

[Ankit kumar @Ankit_kumar_290]

Day 9 of #DSACodingChallenge 🚀

Solved LeetCode 131 – Palindrome Partitioning.

Learned how Backtracking explores every possible partition, checks whether each substring is a palindrome, and backtracks to find all valid palindrome partitions.

#LeetCode #Backtracking #Recursion

[Ankit kumar @Ankit_kumar_290]

Day 8 of #DSACodingChallenge 🚀

Solved LeetCode 39 – Combination Sum.

Learned how Backtracking explores all possible combinations by choosing an element, recursively exploring, and undoing the choice to try different paths.

#LeetCode #CPP #DSA #Backtracking #Recursion

[Ankit kumar @Ankit_kumar_290]

Day 7 of #DSACodingChallenge 🚀

Solved LeetCode 52 – N-Queens II.

Learned how to use Backtracking to count all valid N-Queens arrangements instead of storing every board configuration.

#LeetCode #CPP #DSA #Backtracking #Recursion

[Ankit kumar @Ankit_kumar_290]

Day 6 of #DSACodingChallenge 🚀

Solved LeetCode 37 – Sudoku Solver.

Learned how Backtracking fills the Sudoku grid by trying digits, validating each move, and backtracking whenever a choice leads to a dead end.

#LeetCode #CPP #DSA #Backtracking #Recursion

[Ankit kumar @Ankit_kumar_290]

Day 5 of #DSACodingChallenge 🚀

Solved LeetCode 51 – N-Queens
and LeetCode 7 – Reverse Integer.
Learned Backtracking by placing and removing queens to explore all valid solutions, and handled integer overflow while reversing an integer.

#LeetCode #DSA #Backtracking #Recursion

[Ankit kumar @Ankit_kumar_290]

Day 4 of #DSACodingChallenge 🚀

Solved LeetCode 287 – Find the Duplicate Number
Solved Leetcode 15 – 3Sum, and 18 – 4Sum.
Learned Floyd's Slow & Fast Pointer technique to detect the duplicate along with mastering Two Pointers and Sorting for 3Sum & 4Sum.
LeetCode #CPP #DSA

[Ankit kumar @Ankit_kumar_290]

Day 3 of #DSACodingChallenge 🚀

Solved LeetCode 704 – Binary Search (Recursive) and LeetCode 46 – Permutations.

Learned how Backtracking generates all possible permutations through recursion

#LeetCode #CPP #DSA #BinarySearch #Backtracking

[Ankit kumar @Ankit_kumar_290]

Day 2 of #DSACodingChallenge

Solved LeetCode 167 – Two Sum II.

Learned how the Two Pointer approach efficiently finds the target pair in a sorted array with O(n) time and O(1) space, making it much better than the brute-force approach.🚀

#LeetCode #CPP #DSA #TwoPointers

[Ankit kumar @Ankit_kumar_290]

Day 2 of #DSACodingChallenge 🚀

Solved LeetCode 1 – Two Sum (Hashing)

Learned how HashMap stores previously seen values, allowing us to find the required pair in O(n) time instead of using the O(n²) brute-force approach.

#LeetCode #DSA #CPP #HashMap #100DaysOfCode

[Ankit kumar @Ankit_kumar_290]

Every expert was once a beginner.

I've never posted anything before, but today I'm starting something different. I'll document my DSA journey from scratch, stay consistent, and keep learning in public.

Day 1 starts now. 🚀

#DSA #BuildInPublic #Programming #LeetCode