EasyLeetcode: Mastering Data Structures and Algorithms in 5 Weeks ...

Introduction: We're kicking off a new Leetcode series to sharpen our coding skills and prepare for interviews! Over the next 5 weeks, we'll focus on solving problems related to data structures and algorithms while understanding Big O notation for time and space complexity.

To help beginners, we’ve created a list called "EasyLeetcode" with entry-level problems to build confidence.

EasyLeetcode List

Week 1: Arrays and Hashing

1. Two Sum
2. Contains Duplicate
3. Maximize Stock Profits (Best Time to Buy and Sell Stock)
4. Check if Anagram (Valid Anagram)
5. Balanced Parentheses (Valid Parentheses)

Week 2: Linked Lists and Strings

1. Reverse a Linked List
2. Detect a Cycle in a Linked List
3. Remove Node From End of List (Remove Nth Node From End Of List)

Week 3: Trees and Graphs

1. Invert a Binary Tree (Flip Binary Tree)
2. Validate Binary Search Tree Structure
3. Check for Path Sum in Tree (Path Sum)

Week 4: Advanced Tree and Graph Algorithms

1. Check if Tree Contains Subtree (Subtree of Another Tree)
2. Find Lowest Common Ancestor in BST

Week 5: Dynamic Programming

1. Count Ways to Climb Stairs (Climbing Stairs)
2. Maximize House Robbery Amount (House Robber)

The Full Weekly Breakdown:

After completing the EasyLeetcode list, we'll dive into the following weekly topics to solve intermediate and advanced problems:

Week 1: Arrays and Hashing

• Two Sum
• Contains Duplicate
• Maximize Stock Profits
• Check if Anagram
• Balanced Parentheses
• Maximum Subarray
• Product of Array Except Self
• 3Sum
• Merge Intervals
• Group Anagrams

Week 2: Linked Lists and Strings

• Reverse a Linked List
• Detect a Cycle in a Linked List
• Container With Most Water
• Find Minimum in Rotated Sorted Array
• Longest Repeating Character Replacement
• Longest Substring Without Repeated Characters
• Count Number of Islands
• Remove Nth Node From End Of List
• Count Palindromic Substrings
• Pacific Atlantic Water Flow
• Minimum Window Substring

Week 3: Trees and Graphs

• Invert a Binary Tree
• Validate Binary Search Tree
• Non-overlapping Intervals
• Construct Binary Tree from Preorder and Inorder Traversal
• Top K Frequent Elements
• Clone a Graph
• Plan Course Schedule
• Serialize and Deserialize a Binary Tree
• Find Maximum Path Sum in Binary Tree
• Path Sum

Week 4: Advanced Tree and Graph Algorithms

• Subtree of Another Tree
• Find Lowest Common Ancestor in BST
• Prefix Tree (Trie)
• Add and Search Words in Trie
• Find Kth Smallest Element in a BST
• Merge Multiple Sorted Linked Lists
• Find Median from Data Stream
• Insert and Merge Intervals
• Longest Consecutive Sequence
• Word Search II

Week 5: Dynamic Programming

• Climbing Stairs
• Coin Change
• Longest Increasing Subsequence
• Combination Sum
• House Robber
• House Robber II
• Decode Ways
• Unique Paths
• Jump Game
• Word Break

Let’s Get Started! If you’re new to coding or looking to brush up on your fundamentals, EasyLeetcode is the perfect starting point. As you progress, dive into the subsequent weeks to tackle more complex problems.

Follow along, share your progress, and let’s grow together! ??