What You Can Expect from This Course

What You Can Expect from This Course

Imagine walking into your next technical interview and instantly recognizing the problem on the whiteboard — because you’ve already solved it, step by step, in this course.

This is more than just a walkthrough of algorithms. It’s a complete roadmap to mastering problem-solving with C++, designed to prepare you for real-world interviews and elevate your programming confidence. Whether you're aiming for your first tech job or sharpening your competitive edge, this course gives you the clarity, structure, and practice you need.

💡 Here’s what you’ll gain:

  • The confidence to solve real LeetCode problems — not just watch someone else do it

  • A true understanding of how and why algorithms work

  • Fluent problem-solving in C++ for interviews, contests, and school

  • A proven framework for tackling any algorithmic challenge

  • Visual clarity through animations and interactive quizzes

🔍 In-Depth Lessons with Clear Explanations

You’ll work through 75 essential LeetCode problems, each broken down with step-by-step explanations in C++. You won’t just memorize patterns — you’ll understand them. The course builds up from beginner-friendly tasks to more advanced challenges, so you're always learning just outside your comfort zone.

🎥 Interactive and Engaging Learning

Abstract concepts become clear with real-time animations and visual walkthroughs. Every major idea is brought to life through diagrams, quizzes, and illustrations designed to help you retain and apply what you learn — not just passively consume it.

💼 Skills for Real-World Success

Yes, this course helps you pass interviews — but more importantly, it trains you to think like a developer. You’ll gain hands-on experience solving problems under constraints, writing clean C++ code, and applying core techniques that stay useful no matter what tech stack you work with.

🚀 By the end of this course:

You’ll have mastered 75 high-impact algorithms, become faster and more confident at coding, and be fully equipped to face technical interviews, school exams, or competitive programming challenges — all in C++.

Start mastering real-world algorithms today — enroll now and take the first step toward becoming the developer top companies are hiring.


Course curriculum

  • 1

    About this course

  • 2

    Array / String

    • #1 - 1768. Merge Strings Alternately

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    • #2 - 1071. Greatest Common Divisor of Strings

    • #3 - 1431. Kids with the Greatest Number of Candies

    • #4 - 605. Can Place Flowers

    • #5 - 345. Reverse Vowels of a String

    • #6 - 151. Reverse Words in a String

    • #7 - 238. Product of Array Except Self

    • #8 - 334. Increasing Triplet Subsequence

    • #9 - 443. String Compression
  • 3

    Two Pointers

    • #10 - 283. Move Zeroes

    • #11 - 392. Is Subsequence

    • #12 - 11. Container with Most Water

    • #13 - 1679. Max Number of K-Sum Pairs
  • 4

    Sliding Window

    • #14 - 643. Maximum Average Subarray I

    • #15 - 1456. Maximum Number of Vowels in a Substring of Given Length

    • #16 - 1004. Max Consecutive Ones III

    • #17 - 1493. Longest Subarray of 1's After Deleting One Element
  • 5

    Prefix Sum

  • 6

    Hash Map / Set

  • 7

    Stack

    • #24 - 2390 - Removing Stars from a String

    • #25 - 735. Asteroid Collision

    • #26 - 394. Decode String
  • 8

    Queue

    • #27- 933. Number of Recent Calls

    • #28 - 649. Dota2 Senate
  • 9

    Linked List

  • 10

    Binary Tree - DFS

    • #33 - 104. Maximum Depth of a Binary Tree

    • #34 - 872. Leaf-Similar Trees

    • #35 - 1448. Count Good Nodes in Binary Tree

    • #36 - 437. Path Sum III

    • #37 - 1372. Longest ZigZag Path in a Binary Tree

    • #38 - 236. Lowest Common Ancestor of a Binary Tree
  • 11

    Binary Tree - BFS

    • #39 - 199. Binary Tree Right Side View

    • #40 - 1161. Maximum Level Sum of a Binary Tree
  • 12

    Binary Search Tree

    • #41 - 700. Search in a Binary Search Tree

    • #42 - 450. Delete Node in a BST
  • 13

    Graphs - DFS

    • #43 - 841. Keys and Rooms

    • #44 - 547. Number of Provinces

    • #45 - 1466. Reorder Routes to Make All Paths Lead to the City Zero

    • #46 - 399. Evaluate Division
  • 14

    Graphs - BFS

    • #47 - 1926. Nearest Exit from Entrance in Maze

    • #48 - 994. Rotting Oranges
  • 15

    Heap / Priority Queue

    • #49 - 215. Kth Largest Element in an Array

    • #50 - 2336. Smallest Number in Infinite Set

    • #51 - 2542. Maximum Subsequence Score

    • #52 - 2462. Total Cost to Hire K Workers
  • 16

    Binary Search

    • #53 - 374. Guess Number Higher or Lower

    • #54 - 2300. Successful Pairs of Spells and Potions

    • #55 - 162. Find Peak Element

    • #56 - 875. Koko Eating Bananas
  • 17

    Backtracking

    • #57 - 17. Letter Combinations of a Phone Number

    • #58 - 216. Combination Sum III
  • 18

    DP - 1D

    • #59 - 1137. N-th Tribonacci Number

    • #60 - 746. Min Cost Climbing Stairs

    • #61 - 198. House Robber

    • #62 - 790. Domino and Tromino Tiling
  • 19

    DP - Multidimensional

  • 20

    Bit Manipulation

    • #67 - 338. Counting Bits

    • #68 - 136. Single Number

    • #69 - 1318. Minimum Flips to Make a OR b Equal to c
  • 21

    Trie

    • #70 - 208. Implement Trie (Prefix Tree)

    • #71 - 1268. Search Suggestions System
  • 22

    Intervals

    • #72 - 435. Non-overlapping Intervals

    • #73 - 452. Minimum Number of Arrows to Burst Balloons
  • 23

    Monotonic Stack

    • #74 - 739. Daily Temperatures

    • #75 - 901. Online Stock Span
  • 24

    Congrats!

    • Congratulations!

Instructors

I'm Ana Negreanu-Maior, and I'll be your guide in this course. Together with the LAN Academy team, which includes Lucia and Adrian Negreanu-Maior, I will help you work through the "75-problem challenge" from LeetCode, all in C++. This course is designed for beginners, with every solution explained step by step, making each algorithm easier to understand and master.

Social proof: testimonials

This course completely changed my approach to problem-solving!

Andrei Cristian, Student CS, București

I was struggling to understand data structures and algorithms in C++, and LeetCode felt intimidating. This course provided me with a clear and logical problem-solving approach, with step-by-step explanations and animations that made the concepts easy to grasp. After completing it, I significantly improved my problem-solving speed and successfully passed the technical tests for my dream internship!

A must-have course for anyone preparing for technical interviews!

Mihai, Junior Developer, Timișoara

I've taken several online courses, but this one is by far the clearest, most well-structured, and effective! Each problem is explained logically and visually, and the interactive animations make understanding algorithms so much easier. After completing this course, I started solving LeetCode problems much faster and with greater confidence. If you want to increase your chances of landing your dream job, don’t hesitate! 💡 It’s a small investment with a huge impact on your career! Think about it: acing just one interview could mean a salary 10x greater than the cost of this course! Don’t miss out – invest in yourself and your future!

From Confusion to Clarity – Now I Can Solve Any LeetCode Problem!

Daniel, Full-Stack Developer, London

Before taking this course, I would look at interview problems and have no idea where to start. I tried to find solutions, but everything seemed complicated and overwhelming. Now, thanks to clear explanations and a structured methodology, I've learned how to break down complex problems into simple, logical steps, how to approach them efficiently, and how to optimize my solutions like a pro. This course isn’t just about algorithms – it’s about learning to think like a real software engineer! 💡 If you want to become a better programmer, improve your interview performance, and gain a real career advantage, this course is for you! It’s not just an investment in a course – it’s an investment in your professional future!

Leetcode series

Master Algorithms with Practical Insights, Visual Learning, and Career-Boosting Skills

  • Learning by DoingInteractive Animations

    Master essential algorithms through hands-on learning with detailed explanations and step-by-step C++ solutions. Each problem is broken down to make learning intuitive and easy.

  • Interactive Animation

    Every lesson is accompanied by modern animations that help you visualize complex concepts. Learn algorithms faster with clear, visual explanations.

  • Career - Ready Skills

    Get ready for technical interviews at top companies! With 75 LeetCode problems carefully selected and solved, this course will help you confidently tackle industry challenges.

What You'll Gain From This Course:

  • Master 75 Essential LeetCode Problems: Gain in-depth knowledge of the most important algorithms.

  • Step-by-Step C++ Solutions: Understand how to solve complex problems with efficient code.

  • Interactive Animations: Visualize algorithms in action for a deeper understanding.

  • Quizzes to Test Your Knowledge: Reinforce your learning with targeted quizzes after key lessons.

  • Interview Preparation Guide: Equip yourself with the tools and strategies to ace technical interviews.

  • Real-World Coding Skills: Apply your knowledge to real-world programming challenges.