How to LeetCode effectively

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Just Know Most Importance Concept

 

1. Array & Hashing

Problems

Contains Duplicate

Valid Anagram

Two Sum

Group Anagrams

Top K Frequent Elements

Product of Array Except Self

Valid Sudoku

Encode and Decode Strings

Longest Consecutive Sequence

 

2-1. Two Pointers

Problems

Valid Palindrome

Two Sum II Input Array Is Sorted

3Sum

Container With Most Water

Trapping Rain Water

 

2-2. Stack

Problems

Valid Palindrome

Min Stack

Evaluate Reverse Polish Notation

Generate Parentheses

Daily Temperatures

Car Fleet

Largest Rectangle In Histogram. Trees

 

3-1. Binary Search

Problems

Binary Search

Search a 2D Matrix

Koko Eating Bananas

Find Minimum In Rotated Sorted Array

Search In Rotated Sorted Array

Time Based Key Value Store

Median of Two Sorted Arrays

 

3-2. Sliding Window

Problems

Best Time to Buy And Sell Stock

Longest Substring Without Repeating Characters

Longest Repeating Character Replacement

Permutation In String

Minimum Window Substring

Sliding Window Maximum

 

3-3 Linked List

Problems

Reverse Linked List

Merge Two Sorted Lists

Reorder List

Remove Nth Node From End of List

Copy List With Random Pointer

Add Two Numbers

Linked List Cycle

Find The Duplicate Number

LRU Cache

Merge K Sorted Lists

Reverse Nodes In K Group

 

4-1 Trees

Problems

Invert Binary Tree

Maximum Depth of Binary Tree

Diameter of Binary Tree

Balanced Binary Tree

Same Tree

Subtree of Another Tree

Lowest Common Ancestor of a Binary Search Tree

Binary Tree Level Order Traversal

Binary Tree Right Side View

Count Good Nodes In Binary Tree

Validate Binary Search Tree

Kth Smallest Element In a Bst

Construct Binary Tree From Preorder And Inorder Traversal

Binary Tree Maximum Path Sum

Serialize And Deserialize Binary Tree

 

5-1 Tries

Problems

Implement Trie Prefix Tree

Design Add And Search Words Data Structure

Word Search II

 

5-2 Backtracking

Problems

Subsets

Combination Sum

Permutations

Subsets II

Combination Sum II

Word Search

Palindrome Partitioning

Letter Combinations of a Phone Number

N Queens

 

6-1 Heap / Priority Queue

Problems

Kth Largest Element In a Stream

Last Stone Weight

K Closest Points to Origin

Kth Largest Element In An Array

Task Scheduler

Design Twitter

Find Median From Data Stream

 

6-2 Graphs

Problems

Number of Islands

Clone Graph

Max Area of Island

Pacific Atlantic Water Flow

Surrounded Regions

Rotting Oranges

Walls And Gates

Course Schedule

Course Schedule II

Redundant Connection

Number of Connected Components In An Undirected Graph

Graph Valid Tree

Word Ladder

 

6-3 1-D Dynamic Programming 

Problems

Climbing Stairs

Min Cost Climbing Stairs

House Robber

House Robber II

Longest Palindromic Substring

Palindromic Substrings

Decode Ways

Coin Change

Maximum Product Subarray

Word Break

Longest Increasing Subsequence

Partition Equal Subset Sum

 

7-1 Intervals

Problems

Insert Interval

Merge Intervals

Non Overlapping Intervals

Meeting Rooms

Meeting Rooms II

Minimum Interval to Include Each Query

 

7-2 Greedy

Problems

Maximum Subarray

Jump Game

Jump Game II

Gas Station

Hand of Straights

Merge Triplets to Form Target Triplet

Partition Labels

Valid Parenthesis String

 

7-3 Advanced Graphs

Problems

Reconstruct Itinerary

Min Cost to Connect All Points

Network Delay Time

Swim In Rising Water

Alien Dictionary

Cheapest Flights Within K Stops

 

7-4 2-D Dynamic Programming

Problems

Unique Paths

Longest Common Subsequence

Best Time to Buy And Sell Stock With Cooldown

Coin Change II

Target Sum

Interleaving String

Longest Increasing Path In a Matrix

Distinct Subsequences

Edit Distance

Burst Balloons

Regular Expression Matching

 

7-5 Bit Manipulation

Problems

Single Number

Number of 1 Bits

Counting Bits

Reverse Bits

Missing Number

Sum of Two Integers

Reverse Integer

 

8-1 Math & Geometry

Problems

Rotate Image

Spiral Matrix

Set Matrix Zeroes

Happy Number

Plus One

Pow(x, n)

Multiply Strings

Detect Squares