Coding Challenges

A curated collection of coding challenges focused on problem-solving and algorithmic thinking.

The goal of this section is not just to store solutions, but to understand different ways to approach problems and compare possible implementations.

Challenges in this section focus on:

• problem breakdown;
• one or more possible solutions;
• trade-offs between approaches;
• time and space complexity analysis;
• implementation details.

Challenges

Minimum Common Value

Power of Two

Plus One

Two sum

Valid Parentheses

Remove duplicates from Sorted List

Number of 1 Bits

Length of Last Word

Sqrt(x)

First Bad Version

Remove duplicates from Sorted Array

Search Insert Position

Best Time to Buy and Sell Stock

Contains Duplicate

Find The Highest Altitude

Power of Three

Maximum Depth of Binary Tree

Majority Element

Majority Element II

Third Maximum Number

First Unique Character in a String

Remove Element

Isomorphic Strings

Power of Four

Summary Ranges

Ugly Number

Excel Sheet Column

Find the Difference

Move Zeroes

Remove Linked List Elements

Merge Two Sorted Lists

Reverse Linked List

Linked List Cycle

Middle of the Linked List

Palindrome Linked List

Convert Binary Number in a Linked List to Integer

Intersection of Two Linked Lists

Remove Nth node from end of list

Add Two Numbers

Reverse Bits

Add Digits

Guess Number Higher or Lower

Number Complement

Reverse String

Reverse String II