DSA Journal

LeetCode Journal

Arrays Two Pointers Stack Sliding Window

Arrays & Hashing

Contains Duplicate
Easy Array Hash Table Sorting
Valid Anagram
Easy Hash Table String Sorting
Two Sum
Easy Array Hash Table
Group Anagrams
Medium Array Hash Table String Sorting
Product of Array Except Self
Medium Array Prefix Sum
Longest Consecutive Sequence
Medium Array Hash Table Union Find

Two Pointers

Valid Palindrome
Easy Two Pointers String
Two Sum II - Input Array Is Sorted
Medium Array Two Pointers Binary Search
3Sum
Medium Array Two Pointers Sorting
Container With Most Water
Medium Array Two Pointers Greedy
Trapping Rain Water
Hard Array Two Pointers Dynamic Programming Stack Monotonic Stack

Stack

Valid Parentheses
Easy String Stack
Next Greater Element I
Easy Array Hash Table Stack Monotonic Stack
Min Stack
Medium Stack Design
Evaluate Reverse Polish Notation
Medium Array Math Stack
Merge Intervals
Medium Array Stack Sorting
Asteroid Collision
Medium Array Stack Simulation
Next Greater Element II
Medium Array Stack Monotonic Stack
Generate Parentheses
Medium Array Stack String Dynamic Programming Backtracking
Daily Temperatures
Medium Array Stack Monotonic Stack
Car Fleet
Medium Array Stack Sorting Monotonic Stack
Largest Rectangle in Histogram
Hard Array Stack Monotonic Stack

Sliding Window

Best Time to Buy and Sell Stock
Easy Array Dynamic Programming
Longest Substring Without Repeating Characters
Medium Hash Table String Sliding Window