LeetCode 75

A beginner-friendly list curated by LeetCode. This list is a great way to introduce yourself to the core concepts and get in the rhythm of problem-solving.

Array / String

Completed	Title		Status	Notes	Solution

Two Pointers

Completed	Title		Status	Notes	Solution

Sliding Window

Completed	Title		Status	Notes	Solution

Prefix Sum

Completed	Title		Status	Notes	Solution

Hash Map / Set

Completed	Title		Status	Notes	Solution

Stacks

Completed	Title		Status	Notes	Solution

Queues

Completed	Title		Status	Notes	Solution

Linked Lists

Completed	Title		Status	Notes	Solution

Binary Tree - DFS

Completed	Title		Status	Notes	Solution

Binary Tree - BFS

Completed	Title		Status	Notes	Solution

Binary Search Tree

Completed	Title		Status	Notes	Solution

Graphs - DFS

Completed	Title		Status	Notes	Solution

Graphs - BFS

Completed	Title		Status	Notes	Solution

Heaps / Priority Queues

Completed	Title		Status	Notes	Solution

Binary Search

Completed	Title		Status	Notes	Solution

Backtracking

Completed	Title		Status	Notes	Solution

Dynamic Programming - 1D

Completed	Title		Status	Notes	Solution

Dynamic Programming - Multidimensional

Completed	Title		Status	Notes	Solution

Bit Manipulation

Completed	Title		Status	Notes	Solution

Tries

Completed	Title		Status	Notes	Solution

Intervals

Completed	Title		Status	Notes	Solution

Monotonic Stacks

Completed	Title		Status	Notes	Solution

LeetCode 75

A beginner-friendly list curated by LeetCode. This list is a great way to introduce yourself to the core concepts and get in the rhythm of problem-solving.

Array / String

Completed	Title		Status	Notes	Solution
	Merge Strings Alternately	Easy
	Greatest Common Divisor of Strings	Easy
	Kids With the Greatest Number of Candies	Easy
	Can Place Flowers	Easy
	Reverse Vowels of a String	Easy
	Reverse Words in a String	Medium
	Product of Array Except Self	Medium
	Increasing Triplet Subsequence	Medium
	String Compression	Medium

Two Pointers

Completed	Title		Status	Notes	Solution
	Move Zeroes	Easy
	Is Subsequence	Easy
	Container With Most Water	Medium
	Max Number of K-Sum Pairs	Medium

Sliding Window

Completed	Title		Status	Notes	Solution
	Maximum Average Subarray I	Easy
	Maximum Number of Vowels in a Substring of Given Length	Medium
	Max Consecutive Ones III	Medium
	Longest Subarray of 1's After Deleting One Element	Medium

Prefix Sum

Completed	Title		Status	Notes	Solution
	Find the Highest Altitude	Easy
	Find Pivot Index	Easy

Hash Map / Set

Completed	Title		Status	Notes	Solution
	Find the Difference of Two Arrays	Easy
	Unique Number of Occurrences	Easy
	Determine if Two Strings Are Close	Medium
	Equal Row and Column Pairs	Medium

Stacks

Completed	Title		Status	Notes	Solution
	Removing Stars From a String	Medium
	Asteroid Collision	Medium
	Decode String	Medium

Queues

Completed	Title		Status	Notes	Solution
	Number of Recent Calls	Easy
	Dota2 Senate	Medium

Linked Lists

Completed	Title		Status	Notes	Solution
	Reverse Linked List	Easy
	Delete the Middle Node of a Linked List	Medium
	Odd Even Linked List	Medium
	Maximum Twin Sum of a Linked List	Medium

Binary Tree - DFS

Completed	Title		Status	Notes	Solution
	Maximum Depth of Binary Tree	Easy
	Leaf-Similar Trees	Easy
	Count Good Nodes in Binary Tree	Medium
	Path Sum III	Medium
	Longest ZigZag Path in a Binary Tree	Medium
	Lowest Common Ancestor of a Binary Tree	Medium

Binary Tree - BFS

Completed	Title		Status	Notes	Solution
	Binary Tree Right Side View	Medium
	Maximum Level Sum of a Binary Tree	Medium

Binary Search Tree

Completed	Title		Status	Notes	Solution
	Search in a Binary Search Tree	Easy
	Delete Node in a BST	Medium

Graphs - DFS

Completed	Title		Status	Notes	Solution
	Keys and Rooms	Medium
	Number of Provinces	Medium
	Reorder Routes to Make All Paths Lead to the City Zero	Medium
	Evaluate Division	Medium

Graphs - BFS

Completed	Title		Status	Notes	Solution
	Nearest Exit from Entrance in Maze	Medium
	Rotting Oranges	Medium

Heaps / Priority Queues

Completed	Title		Status	Notes	Solution
	Kth Largest Element in an Array	Medium
	Smallest Number in Infinite Set	Medium
	Maximum Subsequence Score	Medium
	Total Cost to Hire K Workers	Medium

Binary Search

Completed	Title		Status	Notes	Solution
	Guess Number Higher or Lower	Easy
	Successful Pairs of Spells and Potions	Medium
	Find Peak Element	Medium
	Koko Eating Bananas	Medium

Backtracking

Completed	Title		Status	Notes	Solution
	Letter Combinations of a Phone Number	Medium
	Combination Sum II	Medium

Dynamic Programming - 1D

Completed	Title		Status	Notes	Solution
	N-th Tribonacci Number	Easy
	Min Cost Climbing Stairs	Easy
	House Robber	Medium
	Domino and Tromino Tiling	Medium

Dynamic Programming - Multidimensional

Completed	Title		Status	Notes	Solution
	Unique Paths	Medium
	Longest Common Subsequence	Medium
	Best Time to Buy and Sell Stock with Transaction Fee	Medium
	Edit Distance	Medium

Bit Manipulation

Completed	Title		Status	Notes	Solution
	Counting Bits	Easy
	Single Number	Easy
	Minimum Flips to Make a OR b Equal to c	Medium

Tries

Completed	Title		Status	Notes	Solution
	Implement Trie (Prefix Tree)	Medium
	Search Suggestions System	Medium

Intervals

Completed	Title		Status	Notes	Solution
	Non-overlapping Intervals	Medium
	Minimum Number of Arrows to Burst Balloons	Medium

Monotonic Stacks

Completed	Title		Status	Notes	Solution
	Daily Temperatures	Medium
	Online Stock Span	Medium