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Algorithm of the Day Series' Articles

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The Happy Number Problem

The Happy Number Problem

77
Comments 9
4 min read
Kadane's Algorithm & The Maximum Subarray Problem
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Kadane's Algorithm & The Maximum Subarray Problem

51
Comments 3
5 min read
Finding the Only Single Number in an Array

Finding the Only Single Number in an Array

20
Comments 4
3 min read
Finding the Middle of a Linked List
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Finding the Middle of a Linked List

34
Comments 2
3 min read
Backspace String Comparisons: Two Ways To Approach a Common Algorithm
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Backspace String Comparisons: Two Ways To Approach a Common Algorithm

11
Comments 6
7 min read
The Stock Span Problem: Using Stacks To Keep Track Of What's Been Seen

The Stock Span Problem: Using Stacks To Keep Track Of What's Been Seen

10
Comments 1
5 min read
Finding the Kth Smallest Element: Walking Through How To Use Depth First Search on a Binary Search Tree
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Finding the Kth Smallest Element: Walking Through How To Use Depth First Search on a Binary Search Tree

11
Comments
6 min read
The Boyer-Moore Majority Vote Algorithm: Finding the Majority Element in an Array
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The Boyer-Moore Majority Vote Algorithm: Finding the Majority Element in an Array

18
Comments 2
5 min read
Sorting Characters in a String By Their Frequency

Sorting Characters in a String By Their Frequency

13
Comments 2
3 min read
Finding the Intersection of Two Arrays

Finding the Intersection of Two Arrays

8
Comments 1
3 min read
Finding the Minimum Path Sum in a Grid with Dynamic Programming
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Finding the Minimum Path Sum in a Grid with Dynamic Programming

8
Comments 1
7 min read
Floyd's Tortoise and Hare Algorithm: Finding a Cycle in a Linked List
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Floyd's Tortoise and Hare Algorithm: Finding a Cycle in a Linked List

97
Comments 7
4 min read
The Sieve of Eratosthenes: Counting the Number of Primes

The Sieve of Eratosthenes: Counting the Number of Primes

13
Comments
3 min read
Add Two Numbers Problems: How to Sum Two Linked Lists
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Add Two Numbers Problems: How to Sum Two Linked Lists

25
Comments 3
6 min read
The Longest Substring With No Repeating Characters
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The Longest Substring With No Repeating Characters

11
Comments 1
6 min read
Merging Sorted Lists, Two Ways

Merging Sorted Lists, Two Ways

12
Comments
9 min read
Finding the Longest Common Prefix
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Finding the Longest Common Prefix

12
Comments 2
5 min read
Reversing a String in Place
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Reversing a String in Place

12
Comments 1
4 min read
The ZigZag Conversion Problem

The ZigZag Conversion Problem

22
Comments 1
7 min read
The Longest Palindromic Substring: Solving the Problem Using Constant Space
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The Longest Palindromic Substring: Solving the Problem Using Constant Space

67
Comments 5
14 min read
Removing an Element in an Array In-Place
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Removing an Element in an Array In-Place

22
Comments 2
5 min read
Solving the Best Time to Buy and Sell Stocks Problem in One Pass
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Solving the Best Time to Buy and Sell Stocks Problem in One Pass

27
Comments 2
7 min read
Don't Underestimate the Two Pointers: Removing the N-th Node from the End of a Linked List
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Don't Underestimate the Two Pointers: Removing the N-th Node from the End of a Linked List

11
Comments
5 min read
Not an "Easy" Algorithm: Rotating an Array, Three Ways
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Not an "Easy" Algorithm: Rotating an Array, Three Ways

88
Comments 19
11 min read
Sudoku Part I: Is the Board Valid?
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Sudoku Part I: Is the Board Valid?

10
Comments
9 min read
Searching an Array, Two Ways
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Searching an Array, Two Ways

9
Comments 3
6 min read
The Climbing Staircase Problem: How to Solve It, and Why the Fibonacci Numbers are Relevant
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The Climbing Staircase Problem: How to Solve It, and Why the Fibonacci Numbers are Relevant

116
Comments 10
5 min read
Transposing and Reversing: How to Rotate a 2D Matrix 90 Degrees

Transposing and Reversing: How to Rotate a 2D Matrix 90 Degrees

19
Comments 2
6 min read
Turning 38 into 2: How to Solve the Add Digits Problem

Turning 38 into 2: How to Solve the Add Digits Problem

11
Comments 7
5 min read
The Gauss Sum, and Solving for the Missing Number
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The Gauss Sum, and Solving for the Missing Number

14
Comments 2
3 min read
Is this Number the Sum of Two Square Integers? Solving The Sum of Squares Algorithm Two Ways

Is this Number the Sum of Two Square Integers? Solving The Sum of Squares Algorithm Two Ways

8
Comments
4 min read
The Word Pattern Algorithm: How to Test if a String Follows a Pattern

The Word Pattern Algorithm: How to Test if a String Follows a Pattern

12
Comments 1
5 min read
Finding the Intersection of Two Arrays

Finding the Intersection of Two Arrays

10
Comments 1
3 min read
Top Interview Question: Finding the First Unique Character in a String using Linear Time
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Top Interview Question: Finding the First Unique Character in a String using Linear Time

16
Comments 2
4 min read
Solving Pascal's Triangle in JavaScript

Solving Pascal's Triangle in JavaScript

29
Comments 3
4 min read
The Maximum Number of Events Problem

The Maximum Number of Events Problem

12
Comments
5 min read
Solving Binary Tree Algorithms Using Recursion and Queues
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Solving Binary Tree Algorithms Using Recursion and Queues

11
Comments
5 min read
From "hello world" to "world hello": Reversing the Words in a String

From "hello world" to "world hello": Reversing the Words in a String

17
Comments 4
4 min read
Finding the Most Frequent Elements in an Array
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Finding the Most Frequent Elements in an Array

12
Comments 1
4 min read
Finding the Angle Between the Hands of a Clock
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Finding the Angle Between the Hands of a Clock

23
Comments 1
5 min read
The Container with the Most Water: Solving an Algorithm about Areas
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The Container with the Most Water: Solving an Algorithm about Areas

7
Comments
5 min read