Problem Journey

DSA

Data Structures and Algorithms. The core logic.

53 Total Solved
23 Easy
25 Medium
5 Hard
20 LeetCode
0 HackerRank
38 NeetCode
6 Other Sources

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LeetCode

20 Solved

143. Reorder List

Medium LeetCode Linked List Two Pointers Stack Queue Mar 15, 2026

19. Remove Nth Node From End of List

Medium LeetCode Linked List Two Pointers Mar 15, 2026

141. Linked List Cycle Detection

Easy LeetCode Linked List Two Pointers Mar 15, 2026

205. Isomorphic Strings

Easy LeetCode Hash Table String Mar 15, 2026

138. Copy List with Random Pointer

Medium LeetCode Hash Table Linked List Mar 15, 2026

2. Add Two Numbers

Medium LeetCode Linked List Math Recursion Mar 15, 2026

Reverse Linked List

Easy LeetCode Linked List Recursion Mar 14, 2026

Merge Two Sorted Linked Lists

Easy LeetCode Linked List Recursion Mar 14, 2026

Median of Two Sorted Arrays

Hard LeetCode Array Binary Search Divide and Conquer Mar 14, 2026

Best Time to Buy and Sell Stock

Easy LeetCode Array Dynamic Programming Feb 22, 2026

Evaluate Reverse Polish Notation

Medium LeetCode Array Stack Math Feb 01, 2026

Build an Array With Stack Operations

Easy LeetCode Array Stack Simulation Feb 01, 2026

How Many Numbers Are Smaller Than the Current Number

Medium LeetCode Array Hash Table Sorting Counting Sort Jan 31, 2026

Find All Numbers Disappeared in an Array

Easy LeetCode Array Hash Table Jan 31, 2026

Set Mismatch

Easy LeetCode Array Hash Table Bit Manipulation Sorting Jan 30, 2026

Max Consecutive Ones

Easy LeetCode Array Jan 29, 2026

Shuffle the Array

Easy LeetCode Array Jan 28, 2026

Concatenation of Array

Easy LeetCode Array Jan 28, 2026

Two Sum

Easy LeetCode Array Hash Table Jan 23, 2026

Title

Easy LeetCode Array Jan 01, 2025

HackerRank

0 Solved

No HackerRank problems yet.

NeetCode

38 Solved

143. Reorder List

Medium NeetCode Linked List Two Pointers Stack Queue Mar 15, 2026

19. Remove Nth Node From End of List

Medium NeetCode Linked List Two Pointers Mar 15, 2026

141. Linked List Cycle Detection

Easy NeetCode Linked List Two Pointers Mar 15, 2026

205. Isomorphic Strings

Easy NeetCode Hash Table String Mar 15, 2026

138. Copy List with Random Pointer

Medium NeetCode Hash Table Linked List Mar 15, 2026

2. Add Two Numbers

Medium NeetCode Linked List Math Recursion Mar 15, 2026

Reverse Linked List

Easy NeetCode Linked List Recursion Mar 14, 2026

Merge Two Sorted Linked Lists

Easy NeetCode Linked List Recursion Mar 14, 2026

Median of Two Sorted Arrays

Hard NeetCode Array Binary Search Divide and Conquer Mar 14, 2026

Search a 2D Matrix

Medium NeetCode Array Binary Search Matrix Mar 07, 2026

Find Minimum in Rotated Sorted Array

Medium NeetCode Array Binary Search Mar 07, 2026

Koko Eating Bananas

Medium NeetCode Array Binary Search Mar 07, 2026

Largest Rectangle In Histogram

Hard NeetCode Array Stack Monotonic Stack Mar 06, 2026

Car Fleet

Medium NeetCode Array Stack Sorting Monotonic Stack Mar 06, 2026

Valid Parentheses

Easy NeetCode String Stack Mar 04, 2026

Sliding Window Maximum

Hard NeetCode Array Sliding Window Queue Monotonic Queue Mar 04, 2026

Minimum Window Substring

Hard NeetCode String Sliding Window Hash Table Mar 04, 2026

Evaluate Reverse Polish Notation

Medium NeetCode Array Math Stack Mar 04, 2026

Daily Temperatures

Medium NeetCode Array Stack Monotonic Stack Mar 04, 2026

Permutation in String

Medium NeetCode String Sliding Window Hash Table Mar 03, 2026

Longest Repeating Character Replacement

Medium NeetCode String Sliding Window Hash Table Mar 03, 2026

Longest Substring Without Repeating Characters

Medium NeetCode String Sliding Window Hash Set Feb 27, 2026

Best Time to Buy and Sell Stock

Easy NeetCode Array Dynamic Programming Feb 22, 2026

Trapping Rain Water

Hard NeetCode Array Two Pointers Dynamic Programming Feb 21, 2026

Three Integer Sum

Medium NeetCode Array Two Pointers Sorting Feb 21, 2026

Container With Most Water

Medium NeetCode Array Two Pointers Greedy Feb 21, 2026

Two Integer Sum II

Medium NeetCode Array Two Pointers Feb 19, 2026

Valid Sudoku

Medium NeetCode Array Hash Table Matrix Feb 18, 2026

Valid Palindrome

Easy NeetCode String Two Pointers Feb 18, 2026

Longest Consecutive Sequence

Medium NeetCode Array Hash Table Union Find Feb 18, 2026

Top K Frequent Elements

Medium NeetCode Array Hash Table Heap (Priority Queue) Feb 17, 2026

Product of Array Except Self

Medium NeetCode Array Prefix Sum Feb 17, 2026

String Encode and Decode

Medium NeetCode String Design Array Feb 17, 2026

Group Anagrams

Medium NeetCode Array Hash Table String Sorting Feb 14, 2026

Valid Anagram

Easy NeetCode String Hash Table Sorting Feb 12, 2026

Two Sum

Easy NeetCode Array Hash Table Feb 12, 2026

Contains Duplicate

Easy NeetCode Array Hash Table Feb 11, 2026

Title

Easy NeetCode Array Jan 01, 2025

Other Sources

6 Solved