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# Algorithm of the Day Series' Articles

Back to Alisa Bajramovic's Series
The Happy Number Problem

## The Happy Number Problem

Kadane's Algorithm & The Maximum Subarray Problem

## Kadane's Algorithm & The Maximum Subarray Problem

Finding the Only Single Number in an Array

## Finding the Only Single Number in an Array

Finding the Middle of a Linked List

## Finding the Middle of a Linked List

Backspace String Comparisons: Two Ways To Approach a Common Algorithm

## Backspace String Comparisons: Two Ways To Approach a Common Algorithm

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

Finding the Kth Smallest Element: Walking Through How To Use Depth First Search on a Binary Search Tree

## Finding the Kth Smallest Element: Walking Through How To Use Depth First Search on a Binary Search Tree

The Boyer-Moore Majority Vote Algorithm: Finding the Majority Element in an Array

## The Boyer-Moore Majority Vote Algorithm: Finding the Majority Element in an Array

Sorting Characters in a String By Their Frequency

## Sorting Characters in a String By Their Frequency

Finding the Intersection of Two Arrays

## Finding the Intersection of Two Arrays

Finding the Minimum Path Sum in a Grid with Dynamic Programming

## Finding the Minimum Path Sum in a Grid with Dynamic Programming

Floyd's Tortoise and Hare Algorithm: Finding a Cycle in a Linked List

## Floyd's Tortoise and Hare Algorithm: Finding a Cycle in a Linked List

The Sieve of Eratosthenes: Counting the Number of Primes

## The Sieve of Eratosthenes: Counting the Number of Primes

The Longest Substring With No Repeating Characters

## The Longest Substring With No Repeating Characters

Merging Sorted Lists, Two Ways

## Merging Sorted Lists, Two Ways

Finding the Longest Common Prefix

## Finding the Longest Common Prefix

Reversing a String in Place

## Reversing a String in Place

The ZigZag Conversion Problem

## The ZigZag Conversion Problem

The Longest Palindromic Substring: Solving the Problem Using Constant Space

## The Longest Palindromic Substring: Solving the Problem Using Constant Space

Removing an Element in an Array In-Place

## Removing an Element in an Array In-Place

Solving the Best Time to Buy and Sell Stocks Problem in One Pass

## Solving the Best Time to Buy and Sell Stocks Problem in One Pass

Don't Underestimate the Two Pointers: Removing the N-th Node from the End of a Linked List

## Don't Underestimate the Two Pointers: Removing the N-th Node from the End of a Linked List

Not an "Easy" Algorithm: Rotating an Array, Three Ways

## Not an "Easy" Algorithm: Rotating an Array, Three Ways

Sudoku Part I: Is the Board Valid?

## Sudoku Part I: Is the Board Valid?

Searching an Array, Two Ways

## Searching an Array, Two Ways

The Climbing Staircase Problem: How to Solve It, and Why the Fibonacci Numbers are Relevant

## The Climbing Staircase Problem: How to Solve It, and Why the Fibonacci Numbers are Relevant

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

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

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

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

The Gauss Sum, and Solving for the Missing Number

## The Gauss Sum, and Solving for the Missing Number

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

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

Finding the Intersection of Two Arrays

## Finding the Intersection of Two Arrays

Top Interview Question: Finding the First Unique Character in a String using Linear Time

## Top Interview Question: Finding the First Unique Character in a String using Linear Time

Solving Pascal's Triangle in JavaScript

## Solving Pascal's Triangle in JavaScript

The Maximum Number of Events Problem

## The Maximum Number of Events Problem

Solving Binary Tree Algorithms Using Recursion and Queues

## Solving Binary Tree Algorithms Using Recursion and Queues

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

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

Finding the Most Frequent Elements in an Array